Operating manual. ph/ion/cond 750. Multiparameter laboratory meter for ph, ion concentration and conductivity

Transcription

1 Operating manual inolab ph/ion/cond 750 ph/ion/cond 750 Multiparameter laboratory meter for ph, ion concentration and conductivity

2 Accuracy when going to press The use of advanced technology and the high quality standard of our instruments are the result of continuous development. This may result in differences between this operating manual and your instrument. Also, we cannot guarantee that there are absolutely no errors in this manual. Therefore, we are sure you will understand that we cannot accept any legal claims resulting from the data, figures or descriptions. Warranty We guarantee the instrument described for 3 years from the date of purchase. The instrument warranty covers manufacturing faults that are discovered within the warranty period. The warranty does not cover components that are replaced during maintenance work, e. g. batteries. The warranty claim extends to restoring the instrument to readiness for use but not, however, to any further claim for damages. Improper handling or unauthorized opening of the instrument invalidates any warranty claim. To ascertain the warranty liability, return the instrument and proof of purchase together with the date of purchase freight paid or prepaid. Copyright Weilheim 2007, WTW GmbH Reproduction in whole - or even in part - is prohibited without the express written permission of WTW GmbH, Weilheim. Printed in Germany.

3 inolab ph/ion/cond 750 Contents 1 Overview General information Display Keys Socket field Meter software Safety Authorized use General safety instructions Commissioning Scope of delivery Connecting the power pack Switching on the meter Settings Updating the meter software Checking the version of the meter software Updating the meter software Basic principles of operation General information Display General information Status display indicators Softkey functions Symbols in the Menu mode Display of current measured values Display of stored measured values Keys IBM PC keyboard Barcode reader Menu Recalling measurement data Measurement data display on the screen Downloading measurement data to the integrated printer

4 Contents inolab ph/ion/cond Downloading measurement data to the RS232 interface System settings Date and time Language selection Display settings Display contrast Display illumination Acoustic signals Temperature Temperature unit Temperature measurement User profiles Opening the Administration menu Opening the Administration window Setting up, editing, erasing a user profile Print the list of user profiles Password for user names Changing the password Assigning a password Password forgotten? ph Settings for ph Displaying ph/ise or measured voltage values Setting the ph display Measured value resolution of voltage display Measured value resolution of ph display Connecting the reference electrode inputs Resetting to default settings Calibrating ph measurements Buffer sets Calibration settings Calibration Measuring the ph value Measuring the ORP voltage

5 inolab ph/ion/cond 750 Contents 7 Ion concentration Settings for ISE Displaying ph/ise or voltage values Setting up the ISE display Determining the measuring range Measured value resolution of voltage display Connecting the reference electrode inputs Resetting to default settings Advanced settings for ISE Units of the ISE display Blank value correction (BV corr.) Reference measurement (Ref. meas) Criterion for AutoRead (AutoRead) Calibration for ion-selective measurements Measuring the ion concentration Selecting the measuring method Standard addition (Std. add.) Double standard addition (Std. add. ++) Standard subtraction (Std. sub.) Sample addition (Smp. add.) Sample subtraction (Smp. sub.) Standard addition with blank value correction (Blank add.) Conductivity Settings for conductivity measurements Determining the measuring range Selecting the reference temperature Displaying the conductivity or specific resistance Reset (Reset)

6 Contents inolab ph/ion/cond Determining/setting the temperature compensation Selecting the nonlinear temperature compensation TC nlf Selecting the linear temperature compensation TC lin Selecting and adjusting the nonlinear temperature compensation TC nlin Selecting and determining the nonlinear temperature compensation TC nlin Selecting and determining the nonlinear temperature compensation TC nlin Selecting and determining the nonlinear temperature compensation TC nlin Switching off the temperature compensation Determining/setting up the cell constant Determining the cell constant (calibration) Setting the cell constant Measuring the conductivity General information Displaying the conductivity, total dissolved solids (TDS) or salinity Drift control (AutoRead) Data memory Storage of measurement datasets Saving individual measurement datasets Automatically storing measurement datasets Displaying stored measurement datasets Deleting stored measurement datasets Memory of system configurations Saving the system configuration Recalling a system configuration Deleting a system configuration Memory of calibration records

7 inolab ph/ion/cond 750 Contents 10 Data download Data download to the display Numerical display Graphical display Downloading data to the integrated printer General information Switching on the integrated printer Downloading data to the integrated printer Printing Downloading data to an external printer/pc Switch the data download to the RS232/REC interface Setting the baud rate Determining the data format Setting the print interval Downloading data to an external printer or PC Downloading data to the external recorder Maintenance, cleaning, disposal Maintenance Exchanging the batteries Exchanging the roll of paper Maintenance of sensors Cleaning Disposal What to do if System messages Printer messages ph/voltage messages Ion concentration messages Conductivity messages

8 Contents inolab ph/ion/cond Technical Data Meter ph/voltage Ion concentration Conductivity Lists Abbreviations Glossary Index

9 inolab ph/ion/cond 750 Overview 1 Overview 1.1 General information The inolab ph/ion/cond 750 compact multiparameter measuring instrument enables you to perform ph and ORP measurements, concentration measurements using ion sensitive electrodes and conductivity measurements rapidly and reliably. The inolab ph/ion/cond 750 provides the maximum degree of operating comfort, reliability and measuring certainty for all applications. The integrated printer* enables to document measurements according to GLP requirements. The proven MultiCal calibration procedures and the special AutoRead function support you in your work with the meter. 4 3 ph/ion/cond Keypad 2 Display 3 Socket field 4 Printer* * only on the inolab ph/ion/cond 750 with integrated printer 9

10 Overview inolab ph/ion/cond 750 The inolab ph/ion/cond 750 can be connected to a PC and operated with the MultiLab pilot software. Moreover, the MultiLab pilot provides numerous functions for the documentation and evaluation of measured values. The newest software version of MultiLab pilot is available on the Internet under Note The meter is also available as part of individual Sets of equipment. Information on this and other accessories is given in the WTW catalog, LABORATORY AND FIELD INSTRUMENTATION, or is available via the Internet. 1.2 Display Menu line to select the measuring and display settings 2 Type of temperature measurement, i.e. manual entry, external or integrated temperature sensor 3 Status line that displays the active functions and settings 4 Softkey functions 5 Current temperature value 6 Current measured value 7 Selected measured parameter 10

11 inolab ph/ion/cond 750 Overview The measured value, active functions or settings and available menu items that are displayed always correspond to the active sensor and the selected measured parameter. 1.3 Keys The topmost row of keys consists of softkeys. Each softkey carries out the softkey function that is displayed directly above the key. A detailed diagram and description of the keys and softkeys is given in chapter 4 BASIC PRINCIPLES OF OPERATION. 11

12 Overview inolab ph/ion/cond Socket field Connectors: Probe ph/u Probe TP Ref ph/u Probe 2 TP Ref Keyboard RS 232/Rec 7,5...12V/DC input ph/ise 1 ph/ise 2 Conductivity 1 Conductivity measuring cell ph/ise 1: 2 ph/orp electrode or ion sensitive electrode (DIN or BNC socket) 3 Reference electrode 4 Temperature sensor ph/ise 2: 5 ph/orp electrode or ion sensitive electrode (DIN or BNC socket) 6 Reference electrode 7 Temperature sensor Other connectors: 8 PC keyboard 9 Power pack 10 Serial interface RS 232 / analog output (recorder) 12

13 inolab ph/ion/cond 750 Overview Caution The line voltage on site must lie within the input voltage range of the original power pack. Use original power packs only (see chapter 13 TECHNICAL DATA). Independent ph/ise inputs Both ph/ise inputs, ph/u sample 1 and ph/u sample 2, have their own connections for temperature sensor and reference electrode. Each ph or ISE measurement can use its own reference electrode that is independent of the other measurement. If both ph/ise measurements should use the same reference electrode, the two Ref connections can be bridged with a standard laboratory cable or via the menu item, Ref conn. Galvanic isolation of inputs All inputs for measurement are galvanically isolated from other connections such as the RS 232 interface. Thus it is possible to measure in grounded media even while the meter is simultaneously connected to a grounded printer or PC Meter software The inolab ph/ion/cond 750 meter software (firmware) can be updated. You can always install the newest software version via a connected PC and a special update program. The details of the update are given in section 3.5. and in the installation program for the update. Note Further information on the latest software version is available from WTW or on the Internet under 13

14 Overview inolab ph/ion/cond

15 inolab ph/ion/cond 750 Safety 2 Safety Target group Symbols used This operating manual contains basic instructions that you must follow during the commissioning, operation and maintenance of the inolab ph/ion/cond 750. Consequently, all responsible personnel must read this operating manual carefully before working with the meter. The operating manual must always be available within the vicinity of the meter. The meter was developed for use in the laboratory. Thus, we assume that, as a result of their professional training and experience, the operators will know the necessary safety precautions to take when handling chemicals. Warning indicates safety instructions that must be followed to prevent damage to persons and property. Note indicates notes that draw your attention to special features. Note indicates cross-references to other documents, e.g. application reports, operating manuals of electrodes, etc. 15

16 Safety inolab ph/ion/cond Authorized use This meter is authorized exclusively for potentiometric or conductimetric measurements in the laboratory. The technical specifications as given in chapter 13 TECHNICAL DATA must be observed. Only the operation and running of the meter according to the instructions given in this operating manual is authorized. Any other use is considered unauthorized. 2.2 General safety instructions Function and operating safety This meter is constructed and tested in compliance with the EN safety regulations for electronic measuring instruments. It left the factory in a safe and secure technical condition. The smooth functioning and operational safety of the meter can only be guaranteed if the generally applicable safety measures and the specific safety instructions in this operating manual are followed during operation. The smooth functioning and operational safety of the meter can only be guaranteed under the environmental conditions that are specified in chapter 13 TECHNICAL DATA. If the meter was transported from a cold environment to a warm environment, the formation of condensate can impair the functioning of the meter. In this event, wait until the temperature of the meter reaches room temperature before putting the meter back into operation. Warning The meter is only allowed to be opened by personnel authorized by WTW. 16

17 inolab ph/ion/cond 750 Safety Safe operation If safe operation is no longer possible, the instrument must be taken out of service and secured against inadvertent operation! Safe operation is no longer possible if the meter:! has been damaged in transport! has been stored under adverse conditions for a lengthy period of time! is visibly damaged! no longer operates as described in this manual. If you are in any doubt, please contact the supplier of the meter. Obligations of the purchaser The purchaser of this meter must ensure that the following laws and guidelines are observed when using dangerous substances:! EEC directives for protective labor legislation! National protective labor legislation! Safety regulations! Safety datasheets of the chemical manufacturers. 17

18 Safety inolab ph/ion/cond

19 inolab ph/ion/cond 750 Commissioning 3 Commissioning 3.1 Scope of delivery! inolab ph/ion/cond 750 laboratory meter! Power pack! 2 batteries, 1.5 V Mignon type AA (in the instrument)! Software MultiLab pilot on CD-ROM! RS 232 interface cable, AK T-PC (for data transmission on the PC and firmware update).! AK T-K PS2 connection cable to connect a PC keyboard! Passive multifunction box ("stand box")! Operating manual and short operating manual 3.2 Connecting the power pack The power pack supplies the meter with low voltage. Caution The line voltage on site must lie within the input voltage range of the original power pack. Use original power packs only (see chapter 13 TECHNICAL DATA) Connect the plug (2) to the socket (1) of the inolab ph/ion/cond

20 Commissioning inolab ph/ion/cond Fit the country-specific adapter (3) onto the power pack (4). 3 Plug in the original WTW power pack (4) to an easily accessible wall socket. The system is in standby mode. The date and time are displayed. 20

21 inolab ph/ion/cond 750 Commissioning 3.3 Switching on the meter After the power pack is connected and the initializing period is over, the meter switches to standby mode (Standby and the date and time are displayed). When you want to measure, switch the system on. 1 Place the meter on a flat surface and protect it from intense light and heat. 2 Press the e or [Online] key. 3 The meter performs a self-test. As soon as the self-test is completed, a selection of user names is displayed. 4 Select a user name with 82.! Anonym.: Login without password! Admin: Login with password 5 Confirm the user profile with [Ok]. 6 If necessary, enter the password with 82 and 46 and start the login with [[Ok] ]. Two measured values are displayed (three if a conductivity measuring cell is connected). 21

22 Commissioning inolab ph/ion/cond Settings To obtain the best results and to make use of the entire range of functions of the inolab ph/ion/cond 750 meter, the meter must be configured and calibrated. You can adapt the configuration to your measuring environment and your requirements via system settings and sensor-dependent settings. System settings Sensor-dependent settings The system settings include the following settings:! Date and time (chapter 5 SYSTEM SETTINGS)! Display options (chapter 5 SYSTEM SETTINGS)! Language selection (chapter 5 SYSTEM SETTINGS)! Data memory settings (chapter 9 DATA MEMORY)! Printer settings (chapter 10 DATA DOWNLOAD)! Temperature unit (section TEMPERATURE UNIT) Sensor-dependent settings include, e.g.:! Selection of the measuring range! Selection of the display of various measured parameters More detailed information is given in the descriptions of the individual measured parameters in the section SETTINGS (chapter 6 to chapter 8). Calibration More detailed information is given in the descriptions of the individual measured parameters in the section CALIBRATION (chapter 6 to chapter 8). 22

23 inolab ph/ion/cond 750 Commissioning 3.5 Updating the meter software With the aid of a PC, you can update the meter software of the inolab ph/ion/cond 750 to the latest version. To do so, you need:! PC with operating system Windows 95, 98, NT, 2000 or XP! a minimum of 10 MB free memory! a free serial interface (COM port) on your PC! the AK T-PC interface cable (part of the inolab ph/ion/ Cond 750 scope of delivery) and! The installation program to update the meter software. The program is available on the Internet under Note The update takes 4 to approx. 30 minutes, depending on its scale Checking the version of the meter software 1 Swap to offline mode with [Offline]. 2 Swap to the menu with [Menu]. 3 Select the Opt menu with Confirm the Opt menu with g. 5 Select the Setup menu with Confirm the Setup menu with g. 7 Select the Info... menu with Confirm the Info... menu with g. The About window opens. The version number of the firmware appears next to Version : here, "4.09, M3.10". 23

24 Commissioning inolab ph/ion/cond Updating the meter software 1 Start the installation program. In the Windows start menu, the WTW Update inolab ph_ion_cond750 program directory is created. 9 Disconnect the power pack from the inolab ph/ion/ Cond Start the Update program from the Windows start menu, WTW Update inolab ph_ion_cond If necessary, change the language in the Language menu. 12 Plug the AK T-PC serial cable into the "RS232/REC" socket (1) on the meter and connect it with the serial interface (COM ) of the PC. 1 24

25 inolab ph/ion/cond 750 Commissioning 13 Connect the power pack to the inolab ph/ion/ Cond 750 again. The Standby display appears. Updating the software is only possible while the meter is in standby mode. 14 Start the update with OK in the WTW Update inolab ph_ion_cond750 program. The progress of the update (in %) is displayed. The software update takes up to 30 min. 15 When the firmware update is completed, disconnect the inolab ph/ion/cond 750 from the supply voltage for a short time and reconnect it. The Standby display appears. The instrument is ready for operation. 16 Check the version of the firmware (see section 3.5.1). 25

26 Commissioning inolab ph/ion/cond

27 inolab ph/ion/cond 750 Basic principles of operation 4 Basic principles of operation 4.1 General information This section provides basic information on the operation of the meter and the display of the measured values. The meter has two operating modes:! Display mode The display shows the current measured value. Change to the Menu mode using the [Menu] softkey.! Menu mode The display shows open menus and submenus. For example, you can operate or set up the following functions here: - measuring functions - calibration functions - memory functions - printer/interface functions - general and system settings Return to the Display mode with m or by pressing the [ESC] softkey several times. 27

28 Basic principles of operation inolab ph/ion/cond Display General information The display shows measured values, active functions/ settings, available softkey functions and a selection of measuring and display settings in the menu. Example: Display mode Menu Measured parameter, measured value, measured temperature value, Status display indicators Softkey functions Below the display there are three softkeys to perform the displayed softkey functions Status display indicators Status display indicators show active functions/settings. h h flashes i j d j t b l U The AutoRead function is active A measurement with AutoRead is active AutoRange is active Automatic ph calibration with standard buffer solutions, prepared according to DIN 19267, is active Automatic ph calibration with technical buffer solutions is active Conventional ph calibration with any buffer solutions is active Calibration of the conductivity measuring system Calibration of the ion sensitive measuring system 28

29 inolab ph/ion/cond 750 Basic principles of operation v z Temperature sensor is being used ph measurement only: Integrated temperature sensor of a conductivity measuring cell is being used [ ph measurement only: Temperature sensor on the second TP input is being used n q Conductivity measurement only: Temperature compensation "nlf" is active Conductivity measurement only: Temperature compensation "lin" is active! Conductivity measurement only: The TC nlin1 temperature compensation is active " Conductivity measurement only: The TC nlin2 temperature compensation is active 7 Conductivity measurement only: No temperature compensation (TC off) 0 Conductivity measurement only: T Ref = 20 C is selected as the reference temperature 5 Conductivity measurement only: T Ref = 25 C is selected as the reference temperature : Conductivity measurement only: Manually adjusted reference temperature + With ion selective measurements only: Reference value active (see section 7.2.3) - With ion selective measurements only: Blank value correction active (see section 7.2.3) 29

30 Basic principles of operation inolab ph/ion/cond Softkey functions The currently available softkey functions are displayed above the corresponding softkeys. Softkeys are displayed in italics and in square brackets, e.g. [Menu]. p [Menu] [ESC] [Tab] [Next] [Ident] [RCL Menu] [Open] [Start] [Ok] [X] Prints the current display contents (right-hand softkey only) Switches to the Menu mode (left-hand softkey only) Switches to the next higher menu level in the Menu mode, or quits the Menu mode (left-hand softkey only) Swaps between different displays that are open at the same time (e.g. graphical display - numerical measured value) Switches between the different entry fields in an entry window To input the ID of a measured value Opens a selection menu for stored measured values Opens a memory for input/output Starts a measurement Completes the entries Deletes the selected entry 30

31 inolab ph/ion/cond 750 Basic principles of operation Symbols in the Menu mode White script on a black background White script: (example: Baud rate 1200) Function/setting selected Black script on a white background Black script: (example: Baud rate 2400) Selectable function/setting; the function/setting can be selected by pressing 82 Tick Tick (example: Baud rate 4800) Active ( ) function/setting Arrow Arrow (example: Setup) After selecting and confirming by pressing g, a submenu with more functions/settings opens. Dots... Dots... (example: Cal rec....) this menu item has:! A display with entry field(s) (e.g. to enter the calibration interval), or! A special display (e. g. calibration records) 31

32 Basic principles of operation inolab ph/ion/cond Display of current measured values The display shows current measured values clearly by:! Detailed display of a measured value! Simultaneous display of two or three measured values Display of a measured value Example: Display of the ph value. Simultaneous display of both ph/ ISE inputs Instead of the display of a measured value, the following display can be selected if no conductivity measuring cell is connected: [Tab] 32

33 inolab ph/ion/cond 750 Basic principles of operation Triple display The solid frame in the double display marks the active measurement window to which the active menus, submenus, functions and settings refer. Alternately activate the left-hand or right-hand measurement window with [Tab] or 82. If a conductivity measuring cell is connected, you can switch between the following displays: [Tab] [Tab] [Tab] The solid frame marks the active measurement window to which the active menus, submenus, functions and settings refer. Activate the required measurement window with [Tab] or

34 Basic principles of operation inolab ph/ion/cond Display of stored measured values The display shows stored measured values clearly by:! Graphical representation of the course of a series of measurements! Digital recorder display Graphical display Example: graphical display of a stored ph curve. Digital recorder display Measurement datasets that you have stored with the AutoStore function (see section 9.1.2) can be displayed in the form of a graph. Sections of the graph can be zoomed. You can print out the current display. Example: Digital recorder for measurement of the ph value. Like an analog recorder, the digital recorder continuously records the current measured values. The measured values are displayed on the screen graphically and numerically. 34

35 inolab ph/ion/cond 750 Basic principles of operation Keys Three softkeys (display-dependent function keys). The currently available function of the key appears on the display above the key. 2 Switches from the Menu mode to the Display mode or selects the displayed measured parameter 3 Starts a calibration procedure 4 Print-LED* red: printer off (offline) or malfunction green: printer ready for operation (online) 5 Switches printer on/off* (online/offline) 6 Paper feed / line feed* (if printer offline) 7 Increases or reduces values; Selects functions/settings in the Menu mode 8 Makes a selection in the Menu mode and confirms inputs in entry fields 9 Saves a measured value manually 10 Activates/deactivates the AutoRead function 11 Switches the meter on/off 12 Displays/transmits measured values * only on the inolab ph/ion/cond 750 with integrated printer 35

36 Basic principles of operation inolab ph/ion/cond IBM PC keyboard You can also operate the meter via an external keyboard. This enables the input of letters, e.g. for assigning names as identification (ID). The keys of the meter are ordered similarly to the keys in the function block of an IBM PC keyboard. Keyboard of the meter Keys of an IBM PC keyboard In addition, the following keys of the PC keyboard have been allocated to the following functions on the meter: PC keyboard Enter Tab Esc Meter g Softkey [Tab] Softkey [ESC] Note The AK T-K PS2 adapter cable provided with the scope of delivery is required to connect a PC keyboard to the meter. Switching the integrated printer on or off is only possible via the o key on the meter (not via the PC keyboard). 36

37 inolab ph/ion/cond 750 Basic principles of operation Barcode reader The entry of letters, e.g. for assignment of names as identification (ID) is also possible with a barcode reader. The AK T-K PS2 adapter cable provided with the scope of delivery is required to connect a barcode reader to the meter. 4.3 Menu The main menu line of the display contains four main menus.! The Meas main menu contains the settings for measuring with the displayed or highlighted sensor.! The Cal main menu contains the settings for calibrating the displayed or highlighted sensor.! The Mem main menu contains functions to store and display measured values and system configurations.! The Opt main menu contains general settings, e.g. for the temperature unit or time, and configurations of the meter, e.g. of the display. Calling up the menu 1 Switch on the meter (see section 3.3) The Display mode is active. The display shows a measured value (e.g. ph value). The [Menu] and p softkeys are available. 37

38 Basic principles of operation inolab ph/ion/cond Switch to the Menu mode with [Menu]. The last main menu used, e.g. Opt, is opened and the last menu item used, e.g. Setup, is selected. The [ESC] softkey is available. Active ( ) function Selectable function A submenu with further settings is available Using a menu Action Key Switch to the next higher menu Press [ESC] Select a different main menu Press 46 Confirm the selected menu item Press g Select another menu item Press 82 Quitting a menu Action Switch to the next higher menu Switch to the Display mode Key Press [ESC] Press m How to operate the menu is explained in detail in the following example. 38

39 inolab ph/ion/cond 750 Basic principles of operation Example Setting the temperature unit Starting point: ph measurement in the Display mode 1 Switch to the Menu mode with [Menu]. 2 Use 46 to select the Opt main menu. 3 Select the Setup menu item with Confirm the Setup menu item with g. 5 Select the Temp unit menu item with

40 Basic principles of operation inolab ph/ion/cond Confirm the Temp unit menu item with g. 7 Select the Celsius or Fahrenh. setting with Confirm the selected temperature unit with g. The selected temperature unit is active ( ). 9 Terminate the Menu mode with m. The temperature unit is shown on the display. 40

41 inolab ph/ion/cond 750 Basic principles of operation 4.4 Recalling measurement data You can display measured values on the display graphically and numerically, and download them to a printer, an analog recorder, or a PC Measurement data display on the screen Sample display Representation Numerical display Display of the current measured value and the measured temperature value. Graphical display Display of the measurement datasets stored with AutoStore in the form of graphs. The graph can be downloaded to a printer (see chapter 10 DATA DOWNLOAD). Numerical display Display of the measurement datasets stored with AutoStore in the form of lists. The values can be downloaded to a printer (see chapter 10 DATA DOWNLOAD). Digital recorder The digital recorder shows the current measured values in the form of a graph on the display (and the internal printer). 41

42 Basic principles of operation inolab ph/ion/cond Downloading measurement data to the integrated printer* On a meter with integrated printer, you can download all displays directly to the internal printer. In order to print measurement datasets, it is necessary to configure the printer. The detailed settings of the menu can be found in chapter 10 DATA DOWNLOAD. If the internal printer is switched on, start the download of individual measurement datasets with the p softkey. Printing data from the memory is started via Print functions in the menu. If the digital recorder is on, the course of the measurement is shown as a graph on the display. Simultaneously, you can download the graphical display to the integrated printer Downloading measurement data to the RS232 interface Via the RS 232 interface, you can download numerical measuring data to an external printer, an analog recorder or a PC. Note If you download the data to a PC, you can easily transfer the data to a database (see section ). * only on the inolab ph/ion/cond 750 with integrated printer 42

43 inolab ph/ion/cond 750 System settings 5 System settings 5.1 Date and time The integrated real-time clock serves to display the date and time on the screen and on printouts. Two batteries buffer the clock against power failure (to exchange the batteries, see section 11.1 MAINTENANCE). 1 Switch to the Menu mode 2 Use 46 to select the Opt main menu. 3 Select the Setup menu item with Confirm the Setup menu item with g. 5 Select the Set time... menu item with Confirm the Set time... menu item with g. The Set time window appears on the display. The entry field for the hours in the Time line is highlighted. 7 Option: Switch between the individual digits with Increase or decrease the number with Press [Next] to switch to the next entry field (hour - minute - day - month - year). 10 Complete the entries for time and date. 11 Terminate the Menu mode with [ESC]. 43

44 System settings inolab ph/ion/cond Language selection 1 Switch to the Menu mode 2 Use 46 to select the Opt main menu. 3 Select the Setup menu item with Confirm the Setup menu item with g. 5 Select the Language menu item with Confirm the Language menu item with g. 7 Using 82, select the Deutsch or English language. 8 Confirm the selection with g. The language is active ( ). 9 Terminate the Menu mode with m. 10 Switch off the meter with o. 11 Switch the inolab ph/ion/cond 750 on again with o. Display texts appear in the selected language. 44

45 inolab ph/ion/cond 750 System settings 5.3 Display settings To adjust the display representation to the lighting conditions you can change the display contrast in 10 steps and switch on a display illumination Display contrast Setting the display contrast 1 Switch to the Menu mode 2 Use 46 to select the Opt main menu. 3 Select the Setup menu item with Confirm the Setup menu item with g. 5 Select the Display menu item with Confirm the Display menu item with g. 7 Select the Display... menu item with Confirm the Contrast... menu item with g. The Display contrast window appears on the display. The Input 0-9 entry field is selected. 9 Increase or decrease the number to set the required contrast with Confirm the input with g. The display contrast is set. 11 Finish the input with [ESC]. The Menu mode is terminated. 45

46 System settings inolab ph/ion/cond Display illumination Switching the display illumination on/off 1 Switch to the Menu mode 2 Use 46 to select the Opt main menu. 3 Select the Setup menu item with Confirm the Setup menu item with g. 5 Select the Display menu item with Confirm the Display menu item with g. 7 Select the BckLight menu item with Confirm the BckLight menu item with g. The display illumination is switched on ( ). 9 To switch off the display illumination: Confirm the BckLight menu item with g. The display illumination is switched off. The sign behind BckLight disappears. 10 Terminate the Menu mode with m. 46

47 inolab ph/ion/cond 750 System settings 5.4 Acoustic signals You can set which events should trigger an acoustic signal:! warnings (Beeper)! the measuring range limits are exceeded (Limit)! any keystroke without function (no func) You can select several options at the same time. Selecting acoustic signals 1 Switch to the Menu mode. 2 Use 46 to select the Opt main menu. 3 Select the Setup menu item with Confirm the Setup menu item with g. 5 Select the Beeper menu item with Confirm the Beeper menu item with g. 7 Using 82, select the Beeper, Limit or no func menu item. 8 Confirm the selected menu item with g. The selected acoustic signal is active ( ). 9 Option: Activate further acoustic signals ( ). 10 Leave the Menu mode with [ESC]. 47

48 System settings inolab ph/ion/cond Temperature The temperature is very important for the reproducibility of measurement results. You can select the unit of the temperature display. The temperature is determined automatically via an external temperature sensor or one that is integrated in the sensor. It is also possible to enter temperature values manually Temperature unit Measured temperature values can be displayed in the unit, C (degrees Celsius) or F (degrees Fahrenheit). 1 Switch to the Menu mode. 2 Use 46 to select the Opt main menu. 3 Select the Setup menu item with Confirm the Setup menu item with g. 5 Select the Temp unit menu item with Confirm the Temp unit menu item with g. 7 Select the required temperature unit, Celsius or Fahrenh., with Confirm the selected menu item with g. The selected temperature unit is active ( ). 9 Terminate the Menu mode with m. 48

49 inolab ph/ion/cond 750 System settings Temperature measurement For reproducible measurements it is essential to determine the corresponding temperature value. Depending on the connected sensors, the meter receives the temperature value from: Sensor Conductivity measuring cell ph/ise electrode Source of the temperature value! Temperature sensor integrated in the sensor! Temperature sensor integrated in the sensor! External temperature sensor NTC30 or Pt1000 (for ph/ise measurements only)! Integrated temperature sensor of another sensor (e.g. of a conductivity measuring cell)! Manual input of the temperature value The used temperature sensor is indicated on the display by v or z. Using an integrated temperature sensor Sensors with an integrated temperature sensor always measure the measured parameter and temperature simultaneously. If the integrated temperature sensor is recognized, the measured temperature value and the v status indicator appear on the display. Using the temperature sensor of another sensor If no temperature sensor is available for ph measurement, you can take over an existing temperature value (from the conductivity measuring cell or the other ph/ise input). 49

50 System settings inolab ph/ion/cond 750 To do so proceed as follows: 1 Immerse the conductivity measuring cell or temperature sensor of the second ph/ise input in the test sample (for ph measurement). 2 Switch to the Menu mode. 3 Use 46 to select the Meas main menu. 4 Select the ph setup menu item with Confirm the ph setup menu item with g. 6 Select the TP altern. menu item with Confirm the TP altern. menu item with g. The temperature measurement is active ( ). 8 Terminate the Menu mode with m. v or z appears on the display for a check. Using an external temperature sensor If you want to measure the temperature for ph measurements with an external temperature sensor proceed as follows: 1 Connect a temperature sensor to the measuring module. 2 Immerse the temperature sensor in the test sample. The measured temperature value is shown on the display. 50

51 inolab ph/ion/cond 750 System settings Manually entering the temperature value for ph measurements If you want to enter the temperature for ph measurements manually instead of measuring it automatically, proceed as follows: 1 Measure the current temperature of the test sample. 2 Switch to the Menu mode. 3 Use 46 to select the Meas main menu. 4 Select the ph setup menu item with Confirm the ph setup menu item with g. 6 Call up the TP man... menu item with Confirm the TP man... menu item with g. 8 Option: Move between the individual digits with Set the temperature value with Confirm the temperature value with g. 11 Finish the input with [ESC]. The adjusted temperature value is displayed. 51

52 System settings inolab ph/ion/cond 750 Manually entering the temperature value for ISE measurements If you want to enter the temperature for ISE measurements manually instead of measuring it automatically, proceed as follows: 1 Measure the current temperature of the test sample. 2 Switch to the Menu mode. 3 Use 46 to select the Meas main menu. 4 Select the ISE setup menu item with Confirm the ISE setup menu item with g. 6 Call up the TP setup menu item with Confirm the TP setup menu item with g. 8 Call up the TP man... menu item with Confirm the TP man... menu item with g. 10 Option: Move between the individual digits with Set the temperature value with Confirm the temperature value with g. 13 Finish the input with [ESC]. The adjusted temperature value is displayed. 52

53 inolab ph/ion/cond 750 System settings 5.6 User profiles All documented measurement and calibration data is recalled together with the user name. User profiles contain the user name and the corresponding authorization. Name Access Authorized Admin protected by password! to measure all measured parameters! to calibrate all parameters! to change all settings! to store all settings! to unlock/lock the login with the user name, Anonym.! to set up/erase user profiles Anonym. free! to measure all measured parameters! to calibrate all parameters! to change all settings! to store all settings User profiles set up by the user protected by password Setting: 0 (0 = none)! to measure all measured parameters! to calibrate all parameters! to change all settings! to store all settings Setting: ! to measure one measured parameter! to calibrate one parameter! to change the setting of one measured parameter The administration of user profiles is only possible with a login with the user name, Admin. 53

54 System settings inolab ph/ion/cond 750 Note The user name, Anonym., offers quick access to the inolab ph/ion/cond 750 meter without input of a password. The administrator can lock or unlock this access (see section 5.6.3). In the delivery condition, the password "0001" is preset for the user name, Admin. The administrator (login with the user name, Admin) administrates user names and authorizations (see section 5.6.3):! Unlock/lock the login with the user name, Anonym.! Set up a user profile! Change a user profile! Erase a user profile! Print the list of user profiles 54

55 inolab ph/ion/cond 750 System settings Opening the Administration menu 1 Switch to standby mode with e. 2 Swap to offline mode with [Offline]. 3 Select the Admin menu item with Confirm the user name with [Ok]. 5 Enter the password for the user name with 82 and Confirm the password with [Ok]. The access to the settings in offline mode is opened. 7 Switch to the Menu mode with [Menu]. 8 Select the Opt menu with Select the User menu item with Confirm the User menu item with g Opening the Administration window 1 Open the User menu (see section 5.6.1). 2 Select the Admin. menu item with Confirm the Admin. menu item with [Ok]. The Admin. window opens. 55

56 System settings inolab ph/ion/cond Setting up, editing, erasing a user profile Unlocking/locking the Anonym. user profile 1 Open the Admin. window (see section 5.6.2). 2 Select the Anonym. menu item with Confirm the user name, Anonym., with [Ok]. A prompt opens up to change the present setting. 4 Using [Next], select Yes. 5 Confirm the change with g. The OFF status indicator appears in the Admin. window near the Anonym. field. The login with the user name, Anonym., is locked. Setting up a user profile 1 Open the Admin. window (see section 5.6.2). 2 Select the??? entry with Confirm the??? entry with [Ok]. A dialog box to enter a new user profile opens up. 4 Enter a user profile. 5 Using [Next], switch to the Setting field. 6 Using 82, select one of the settings, (0 = none). 7 Using [Ok], confirm Name and Setting. The new user profile appears in the Admin. window. 56

57 inolab ph/ion/cond 750 System settings Note If no setting with the selected number is yet stored, a message appears when the user profile is stored. Save a setting (see section 9.2). It is not possible to log in with a user name without a valid setting. Changing a user profile 1 Open the Admin. window (see section 5.6.2). 2 Select a user name with Confirm the user name with [Ok]. A dialog opens for changing the Name or Setting of the user profile. 4 Using [Next], switch to the Setting field. 5 Use 82 to select a value Using [Ok], confirm Name and Setting. The modified user profile appears in the Admin. window. Erasing a user profile 1 Open the Admin. window (see section 5.6.2). 2 Select a user name with Erase the user profile with [X]. A security prompt for erasing the user profile opens up. 4 Using [Next], select Yes. 5 Confirm the deletion with g. The user name is deleted from the list of user names in the Admin. window. 57

58 System settings inolab ph/ion/cond Print the list of user profiles The administrator (login with the user name, Admin) can print out a list of current user profiles or all user profiles. The list of current user profiles (Actual) contains the user profiles which can be used for login. The list of all user profiles (Complete) contains all current and all deleted user profiles that have been used for at least one login. 1 Open the User menu (see section 5.6.1). 2 Select the Print menu item with Confirm the Print menu item with [Ok]. The list of user profiles is printed. 4 Using 82, select the Actual or Complete menu item. 5 Confirm the selection with [Ok]. The list of user profiles is printed. Note A consecutive number for each user profile is also assigned internally. 58

59 inolab ph/ion/cond 750 System settings 5.7 Password for user names The login with the user name, Admin and all self-created user names is protected by a password. Each inolab ph/ion/cond 750 meter is delivered with the password "0001" for the user name, Admin. Change this password as soon as possible Changing the password The password has 4 numerical digits. The password "0000" is not allowed. 1 Switch to standby mode. 2 Switch to the selection of user names with [Online] or [Offline]. 3 Select a user name with Confirm the selection of the user name with [Ok]. The dialog for the password input opens. 5 Switch to the Change Current field with [Next]. 6 Enter the current password with 82 and Switch to the Change new field with [Next]. 8 Input a new four-digit password with 82 and Confirm the new password with [Ok]. The display swaps to the online or offline display. The password is changed. 59

60 System settings inolab ph/ion/cond Assigning a password As long as no login has yet been made with a new user name, this user name is displayed in brackets in the list of user names. The user specifies the password when he or she first logs in with the new user name. Note No access to this user profile is possible without this password. 1 Switch to standby mode. 2 Switch to the selection of user names with [Online] or [Offline]. 3 Select the new user name (name in brackets) with Confirm the selection of the user name with [Ok]. The dialog for the password input opens. 5 Input a four-digit password with 82 and 46. Note The password has 4 numerical digits. The password "0000" is not allowed. 6 Confirm the new password with g. The display swaps to the online or offline display. 60

61 inolab ph/ion/cond 750 System settings Password forgotten? User profile set up by the user It is not possible to log in with this user name without a password. The administrator can delete and recreate the user profile (see section 5.6.3). Admin In emergencies, it is also possible to log in with the user name, Admin using a special enabling code obtained from WTW GmbH. The addresses and telephone numbers of the WTW GmbH are given on the cover of this operating manual. 61

62 System settings inolab ph/ion/cond

63 inolab ph/ion/cond 750 ph 6 ph 6.1 Settings for ph We recommend to check the current settings and correct them as necessary before measurement Displaying ph/ise or measured voltage values For ph measurements, the inolab ph/ion/cond 750 enables rapid switching between the display of the ph value (ph) and the voltage (U). 1 Activate the Display mode. 2 Switch to the display of the ph value with m. 3 Switch between the measured value display of the ph value (ph) and voltage (U) with

64 ph inolab ph/ion/cond Setting the ph display The selection of the measured parameter ISE or ph is made in the Meas main menu. The active ph or ISE setting is marked with. Measured parameter, ph 1 Switch to the Menu mode. 2 Use 46 to select the Meas main menu. 3 Select the ph menu item with Confirm the ph menu item with g. The ph display is active ( ). 5 Terminate the Menu mode with m. The ph value appears on the display. 64

65 inolab ph/ion/cond 750 ph Measured value resolution of voltage display You can select the resolution of the voltage measurement with the U-AutoRng function:! If U-AutoRng is not active, voltages in the range of to mv are measured with a resolution of 1 mv.! If U-AutoRng is active, voltages in the range of mv to mv are measured with a resolution of 0.1 mv. The rest of the measuring range remains unchanged. Note If you expect voltages outside the range mv to mv and want to connect a recorder, deactivate U- AutoRange. Otherwise, the recorder scaling at the range limits will change. Measured value resolution, U 1 Switch to the Menu mode. 2 Use 46 to select the Meas main menu. 3 Select the ph setup menu item with Confirm the ph setup menu item with g. 5 Select the U-AutoRng menu item with Confirm the U-AutoRng menu item with g. The U-AutoRng function is active ( ). Voltages in the range between and are displayed with a resolution of 0.1 mv. 7 Terminate the Menu mode with m. 65

66 ph inolab ph/ion/cond Measured value resolution of ph display You can select the resolution for the ph value:! If the high resolution (ph highres ) is switched on, measurement is carried out over the entire ph range with a resolution of ! If the high resolution (ph highres) is switched off, measurement is carried out over the entire ph range with a resolution of Measured value resolution, ph 1 Switch to the Menu mode. 2 Use 46 to select the Meas main menu. 3 Select the ph setup menu item with Confirm the ph setup menu item with g. 5 Select the ph highres menu item with Confirm the ph highres menu item with g. The resolution is active ( ). 7 Terminate the Menu mode with m. 66

67 inolab ph/ion/cond 750 ph Connecting the reference electrode inputs The inolab ph/ion/cond 750 enables to operate two electrodes with one reference electrode. To do so, the two inputs for the reference electrode are connected. Connecting both inputs is possible via the Meas menu. If the inputs for the reference electrode are connected the Ref conn. menu item is marked by. 1 Activate the Display mode. 2 Use 46 to select the Meas main menu. 3 Select the Ref conn. menu item with Confirm the ph menu item with g. The ph display is active ( ). 5 Terminate the Menu mode with m. The ph value appears on the display. 67

68 ph inolab ph/ion/cond Resetting to default settings You can reset (initialize) the settings for the ph measurement to the default settings. In a reset, the following functions for the ph measurement are reset to the default settings: Measuring mode Asymmetry U Asy in mv Slope S in mv Calibration procedure ph 0 mv mv Temperature, manual 25 C AutoCal TEC ph reset With the Reset ph function, all the settings for ph measurements are reset to the default values. 1 Switch to the Menu mode. 2 Use 46 to select the Cal main menu. 3 Select the Reset ph menu item with Confirm the selected menu item with g. The default settings for ph measurements have been restored. The Menu mode is finished. 68

69 inolab ph/ion/cond 750 ph 6.2 Calibrating ph measurements Why calibrate? When to calibrate? ph electrodes age. This changes the asymmetry (zero point) and slope of the ph electrode. As a result, an inexact measured value is displayed. Calibration determines the current values of the asymmetry and slope of the electrode and stores them. Thus, you should calibrate at regular intervals.! After connecting another electrode! When the sensor symbol flashes: after the calibration interval has expired after a voltage interruption AutoCal ConCal AutoRead You can choose between two calibration procedures: AutoCal and ConCal: is a fully automatic calibration using the datasets selected for buffer solutions in the ph buffer menu. The buffer solutions within a dataset are automatically recognized by the meter. Depending on the instrument setting (see SELECTING THE CALIBRATION PROCEDURE, page 73), the instrument displays the relevant nominal buffer value or the current electrode voltage in mv. The calibration can be terminated after the first buffer solution. This corresponds to a single-point calibration. To do this, the instrument uses the Nernst slope ( mv/ph at 25 C) and determines the asymmetry of the electrode. is the conventional two-point calibration with two buffer solutions (ph 7,0 ± 0,5 and any other buffer solution) or a single-point calibration with one buffer solution as the rapid method. When calibrating with AutoCal, the AutoRead function is automatically activated. The current AutoRead measurement can be terminated at any time (accepting the current value) by pressing g. 69

70 ph inolab ph/ion/cond 750 Calibration record The calibration record contains the calibration data of the current calibration. You can call up the calibration record by recalling the data memory (section 9.3). Note You can automatically print a calibration record following calibration. To do so, switch on the printer before calibrating (print LED lights up green). After a valid calibration, the record is printed. Sample printout: Calibration ph Cal date : Cal time : 22:46 Cal interval : 7 days AutoCal TEC Tman AR Buffer Buffer Buffer Buffer C mv 25 C C mv 25 C C1 0.2 mv 25 C C mv 25 C S mv/ph ASY 0 mv Probe +++ User: xxxxxx 70

71 inolab ph/ion/cond 750 ph Calibration evaluation After calibration, the meter automatically evaluates the current status of the system. The asymmetry and slope are evaluated separately. The displayed sensor symbol shows the worse-case evaluation of both variables.. Display Asymmetry [mv] Slope [mv/ ph] Clean the electrode according to the electrode operating manual E3 Perform error elimination according to chapter 12 WHAT TO DO IF or or < -30 or > 30 < -62 or >

72 ph inolab ph/ion/cond Buffer sets Each time before calibrating, it is necessary to check the adjusted calibration procedure and the used buffer sets. For automatic calibration, you can use the following buffer sets at the specified temperatures. * Buffer set Menu designation ph values WTW technical buffer solutions Buff TEC * Standard buffer solutions according to DIN Merck Titrisole buffers and buffer solutions Riedel de Haen Fixanale buffers and buffer solutions Merck Titrisole buffers and buffer solutions Riedel de Haen Fixanale buffers and buffer solutions Buff DIN Buff Mrk Buff Mrk Merck ready-made buffer solutions Buff Mrk at temp. 25 C 25 C 20 C 20 C 20 C * The TEC calibration for ph is optimized for the WTW technical buffer solution TEP 10 Trace or TPL 10 Trace. Other buffer solutions can lead to an erroneous calibration. The correct buffer solutions are given in the WTW catalog or on the Internet. 72

73 inolab ph/ion/cond 750 ph Calibration settings Selecting the calibration procedure The following calibration procedures can be selected:! AutoCal AutoCal[mV] displays the current electrode voltage in mv during calibration AutoCal[pH] displays the relevant nominal buffer value during calibration! ConCal 1 Switch to the Menu mode. 2 Use 46 to select the Cal main menu. 3 Select the ph caltype menu item with Confirm the ph caltype menu item with g. 5 Using 82, select the AutoCal, AutoCal[pH] or ConCal menu item. 6 Confirm the selected menu item with g. The selected calibration procedure is active ( ). 73

74 ph inolab ph/ion/cond 750 Selecting the buffer dataset For each calibration procedure, you can select between the buffer datasets TEC, DIN and Mrk: 7 Select the ph buffer menu item with Confirm the ph buffer menu item with g. 9 Using 82, select the Buff TEC, Buff DIN or Buff Mrk1 menu item. 10 Confirm the selected buffer dataset with g. The selected setting is active ( ). 11 Terminate the Menu mode with m. 74

75 inolab ph/ion/cond 750 ph Setting the calibration interval The calibration interval determines the time interval between regular system calibrations. The inolab ph/ion/cond 750 reminds you to calibrate regularly by the flashing sensor symbol on the display. The calibration interval is set to 7 days in the factory. You can change the interval (1-999 days). For most applications, we recommend a shorter calibration interval. 1 Switch to the Menu mode. 2 Use 46 to select the Cal main menu. 3 Select the Cal int... menu item with Confirm the Cal int... menu item with g. The Calibration interval entry window appears. 5 Option: Move between the individual digits with Increase or reduce the value with Confirm the value for the calibration interval with g. 8 Terminate the Menu mode with [ESC]. 75

76 ph inolab ph/ion/cond 750 Selecting the unit for the slope The slope determined during calibration can be displayed in the unit mv/ph or %. The % display refers to the Nernst slope of mv/ph (100 x determined slope/nernst slope). 1 Switch to the Menu mode. 2 Use 46 to select the Cal main menu. 3 Select the ph caltype menu item with Confirm the ph caltype menu item with g. 5 Select the Slo [%] menu item with Confirm the Slo [%] menu item with g. The slope display in % is active ( ). 7 Terminate the Menu mode with m. 76

77 inolab ph/ion/cond 750 ph Calibration Preparatory activities 1 Use m and/or 46 to display the ph value. 2 Connect the ph electrode to the meter. 3 Keep the buffer solutions ready (up to 5 solutions, depending on the selected calibration procedure). 4 Adjust the temperature of the solutions and measure the temperature if measurement is made without a temperature sensor. Note During calibration without a temperature sensor, set the current temperature of the respective buffer solution manually (see section 5.5.1). If you use a temperature sensor, it is not necessary to enter the temperature manually. AutoCal calibration For the AutoCal procedure, use buffer solutions according to the buffer table (see section 6.2.1). During calibration, the display shows both the calibration procedure and the number of the next buffer solution before a new buffer solution is used. The display, e.g. ct1 here, has the following meaning: c: The calibration has been started. t: Selected buffer dataset t = Technical buffer or d = DIN buffer or m = Merck buffer Possible values: t, d, m 1: No. of the next buffer solution 1 = 1st buffer solution 2 = 2nd buffer solution 3 =..., etc. Possible values:

78 ph inolab ph/ion/cond 750 The following example covers the autocalibration procedure using WTW technical buffer solutions. If you use other buffer solutions, e. g. DIN buffers or Merck buffer solutions, the displays before using the next buffer will be different. Fivepoint calibration is possible when calibrating with DIN buffers. 1 Select the AutoCal calibration procedure (see section 6.2.2). 2 Select the buffer dataset (see section 6.2.1). 3 Perform the preparatory activities (see section 6.2.3). 4 Start the calibration procedure with c. ct1 appears on the display. 5 If necessary, set the temperature of the first buffer solution with 82 (see section 5.5.2). 6 Immerse the electrode and the temperature sensor in the first buffer solution. 7 Start the measurement with g. The h display indicator flashes. The electrode voltage (U in mv) appears on the display. As soon as a stable value is reached, the display h no longer flashes. ct2 appears on the display. 78

79 inolab ph/ion/cond 750 ph 8 Thoroughly rinse the electrode with deionized water. 9 If necessary, set the temperature of the second buffer solution with 82 (see section 5.5.1). 10 Immerse the electrode and the temperature sensor in the second buffer solution. 11 Start the measurement with g. The h display indicator flashes. The electrode voltage (mv) appears on the display. As soon as a stable value is reached, h disappears. The slope value (mv/ph) and the asymmetry value (mv) appear on the display. The sensor symbol shows the calibration evaluation after the two-point calibration. 12 Use g to go on to three-point calibration (ct3 appears on the display) or terminate after two-point calibration with m (the current calibration data are stored). 79

80 ph inolab ph/ion/cond 750 Three-point calibration 13 Thoroughly rinse the electrode with deionized water. 14 If necessary, set the temperature of the third buffer solution with 82 (see section 5.5.1). 15 Immerse the electrode and the temperature sensor in the third buffer solution. 16 Press the g key. The h display indicator flashes. The electrode voltage (mv) appears on the display. As soon as a stable value is reached, h disappears. The sensor symbol shows the calibration evaluation after three-point calibration. The value of the slope S (in mv/ph) and the value of the asymmetry (in mv) appear on the display. 17 Use g to go on to four-point calibration (ct4 appears on the display) or terminate after three-point calibration with m (the current calibration data are stored). Four-point calibration 18 Thoroughly rinse the electrode with deionized water. 19 If necessary, set the temperature of the fourth buffer solution with 82 (see section 5.5.1). 20 Immerse the electrode and the temperature sensor in the fourth buffer solution. 80

81 inolab ph/ion/cond 750 ph 21 Press the g key. The h display indicator flashes. The electrode voltage (mv) appears on the display. As soon as a stable value is reached, h disappears. The sensor symbol shows the calibration evaluation after four-point calibration. The value of the slope S (in mv/ph) and the value of the asymmetry U Asy (in mv) appear on the display. 22 Press the g key. The ph value and sensor symbol appear on the display. The system is calibrated for ph measurements. Note The calibration line is determined by linear regression. After calibration is finished, the calibration record is automatically printed if the printer is ready for operation. Information on setting up a printer and on the printout of further calibration records is given in chapter 10 DATA DOWNLOAD and section PRINTING. 81

82 ph inolab ph/ion/cond 750 ConCal single-point calibration Only one buffer solution is required for single-point calibration. The ph value should be as close as possible to the expected measured value. Only the electrode asymmetry is then newly determined. The slope of the last two-point calibration is retained. ConCal two-point calibration Use the following buffer solutions:! ph 7.0 ± 0.5! Any other buffer solution so that the measuring range is covered as well as possible Note The ConCal calibration procedure has no temperature compensation. The buffer solutions must have the correct temperature. If you use a temperature sensor, it is not necessary to enter the temperature manually. 1 Select the ConCal calibration procedure (section 6.2.1). 2 Perform the preparatory activities (see section 6.2.3). 3 Start the calibration procedure with c. 4 Immerse the electrode and the temperature sensor in the ph 7.0 ± 0.5 buffer solution. 5 If necessary, set the temperature of the first buffer solution with Use [Adj. Asy] to call up the entry field for the nominal ph value of the buffer solution. 7 Use 82 (and 46) to select the nominal ph value of the buffer solution (at the current temperature). 8 Confirm the nominal ph value with g. 9 Use [ESC] to leave the entry field for the nominal ph value. 82

83 inolab ph/ion/cond 750 ph 10 Use g to display the slope (mv/ph), the asymmetry (mv), and the calibration evaluation (sensor symbol). 11 Use g to go on to two-point calibration or terminate after single-point calibration with m (the present calibration data remain stored). Two-point calibration 12 Thoroughly rinse the electrode with deionized water. 13 Immerse the electrode and the temperature sensor in the second buffer solution. 14 If necessary, set the measured temperature value of the second buffer solution with Use [Adj. Asy] to call up the entry field for the nominal ph value of the buffer solution. 16 Use 82 (and 46) to select the nominal ph value of the buffer solution (at the current temperature). 17 Confirm the nominal ph value with g. 18 Use [ESC] to leave the entry field for the nominal ph value. 19 Press the g key. The slope S (in mv/ph), asymmetry U Asy (in mv) and calibration evaluation (sensor symbol) appear on the display. 83

84 ph inolab ph/ion/cond Press the g key. Calibration is finished. Note After the calibration is finished, the calibration record is automatically printed if the printer is ready for operation. Information on setting up a printer and on printing further calibration records is given in chapter 10 DATA DOWNLOAD and section PRINTING. 84

85 inolab ph/ion/cond 750 ph 6.3 Measuring the ph value Preparatory activities Perform the following preparatory activities when you want to measure: 1 Connect the electrode to the meter. 2 Call up the Display mode with m. 3 Call up the ph measured value display with Adjust the temperature of the solutions and measure the current temperature if the measurement is made without a temperature sensor. 5 With manual temperature input: Use 82 to call up the temperature entry field and adjust the temperature. Use [ESC] to complete the temperature input. 6 Calibrate or check the meter with the electrode. 7 Switch to the measuring mode with m. Note Incorrect calibration of ph electrodes leads to incorrect measured values. Calibrate regularly. The meter has to be calibrated before measuring. Temperature sensor For reproducible measurements it is essential to determine the corresponding temperature value. The meter receives the temperature value from:! an external temperature sensor NTC30 or Pt1000 (see section TEMPERATURE MEASUREMENT)! an integrated temperature sensor of another sensor, e.g. of a conductivity measuring cell (see section TEMPERATURE MEASUREMENT)! Manual input of the temperature value The used temperature sensor is indicated on the display by v or z. 85

86 ph inolab ph/ion/cond Perform the preparatory activities. 2 Immerse the ph electrode in the test sample. The display shows the current measured value. AutoRead (drift control) The AutoRead function (drift control) checks the stability of the measurement signal. The stability has a considerable effect on the reproducibility of the measured value. With identical measuring conditions, the maximum deviation is Call up the Display mode with m. 2 Call up the ph measured parameter with Immerse the ph electrode in the test sample. 4 Activate the AutoRead function with a. The h display appears. The current measured value is frozen (Hold function). 5 Start the AutoRead measurement with g. The h AR display indicator flashes. When a stable signal is reached, an acoustic signal is heard and h stops flashing. 6 If necessary, start the next AutoRead measurement with g. 7 To terminate the AutoRead function: Press the a key. Note In order to accept the current measured value without 86

87 inolab ph/ion/cond 750 ph waiting for the end of the AutoRead function, press g. You can only change to another measured parameter after the AutoRead function is finished. 6.4 Measuring the ORP voltage In conjunction with an ORP electrode, e.g. SenTix ORP, the meter can measure the ORP voltage (U) of a solution. 1 Call up the Display mode with m. 2 Call up the measured parameter U with Submerse the ORP electrode in the sample. 4 Wait for a stable measured value. Note Note that, when measuring ORP voltages, it can take a long time (even several hours) until the measured value becomes stable. ORP electrodes are not calibrated. However, you can check ORP electrodes using a test solution. 87

88 ph inolab ph/ion/cond

89 inolab ph/ion/cond 750 Ion concentration 7 Ion concentration 7.1 Settings for ISE We recommend to check the current settings and correct them as necessary before measurement Displaying ph/ise or voltage values For ph/ise measurements, the inolab ph/ion/cond 750 enables rapid switching between the display of the ph/ise value (ph) and the voltage (U). 1 Activate the Display mode. 2 Switch to the display of the ph/ise value with m. 3 Switch between the measured value display of the ph/ise value (ph) and voltage (U) with Setting up the ISE display Ion-selective electrodes are connected to the ph/u connector. If a reference electrode is available it is connected to the corresponding Ref connector. The selection of the measured parameter ISE or ph is made in the Meas main menu. The active ph or ISE setting is marked with. Measured parameter, ISE 1 Switch to the Menu mode. 2 Use 46 to select the Meas main menu. 3 Select the ISE menu item with

90 Ion concentration inolab ph/ion/cond Confirm the ISE menu item with g. The ISE display is active ( ). 5 Terminate the Menu mode with m. The ion concentration appears on the display (mg/l) Determining the measuring range You can select the measuring range manually or have it selected automatically. We recommend setting the measuring range manually when the intended measurement is output to a recorder at the same time. You can determine the measuring range as follows:! Automatic selection of the measuring range (AutoRange)! Manual selection between the following measuring ranges: Concentration [mg/l] Measuring range 1 (Resolution) (0.001) Measuring range 2 (Resolution) (0.01) Measuring range 3 (Resolution) (0.1) Measuring range 4 (Resolution) (1) 90

91 inolab ph/ion/cond 750 Ion concentration Note If you are using a recorder, we recommend deactivating the AutoRange function. Specify the expected measuring range manually. Otherwise, the recorder scaling will change to a different range due to the switch-over. Manual selection of the measuring range The AutoRng function has to be switched off for the manual selection of the measuring range. 1 Switch to the Display mode. 2 Use 46 to select the required measuring range. Automatic switchover of the measuring range 1 Switch to the Menu mode. 2 Use 46 to select the main Meas menu. 3 Select the ISE setup menu item with Confirm the ISE setup menu item with g. 5 Select the AutoRng menu item with Confirm the AutoRng menu item with g. i appears on the display. 7 Terminate the Menu mode with m. 91

92 Ion concentration inolab ph/ion/cond Measured value resolution of voltage display see section Connecting the reference electrode inputs The inolab ph/ion/cond 750 enables to operate two electrodes with one reference electrode. To do so, the two inputs for the reference electrode are connected. Connecting both inputs is possible via the Meas menu. If the inputs for the reference electrode are connected the Ref conn. menu item is marked by. 1 Activate the Display mode. 2 Use 46 to select the Meas main menu. 3 Select the Ref conn. menu item with Confirm the ph menu item with g. The ph display is active ( ). 5 Terminate the Menu mode with m. The ph value appears on the display Resetting to default settings No default settings are specified for ion-selective measurements. 92

93 inolab ph/ion/cond 750 Ion concentration 7.2 Advanced settings for ISE Units of the ISE display You can select the units of the measured value: 1 Switch to the Menu mode. 2 Use 46 to select the Meas main menu. 3 Select the ISE menu item with Select the ISE setup menu item with Confirm the ISE setup menu item with g. 6 Select the Unit menu item with Confirm the Unit menu item with g. 8 Select a Unit with Confirm the Unit with g. The selected Unit is active ( ). 10 If mg/l was selected: Continue with step If mol/l was selected: Select a Ion type with 82. Continue with step If mg/kg, ppm, % was selected: Enter the density of the sample with 82. Continue with step Confirm the entry with g or [ESC]. The units change over. 14 Switch to the measured value display. 93

94 Ion concentration inolab ph/ion/cond Blank value correction (BV corr.) If the ion concentration in the sample is so small that it is not in the linear range of the electrode, you can increase the ion concentration in the linear range with the blank value correction by the addition of a blank value solution. The displayed measured value is the difference between the actual measured value and the determined blank value. 1 Switch to the Menu mode. 2 Use 46 to select the Meas main menu. 3 Select the ISE menu item with Confirm the ISE menu item with g. 5 Select the ISE setup menu item with Confirm the ISE setup menu item with g. 7 Select the BV corr. menu item with Confirm the BV corr. menu item with g. The BV corr. function is active ( ). The flashing - symbol appears on the measured value display. 9 Perform a calibration (see section 7.3). 10 Use m to finish the calibration. The prompt for the measurement of the blank value appears. 11 Thoroughly rinse the electrode with deionized water. 12 Immerse the electrode in the blank value solution. 94

95 inolab ph/ion/cond 750 Ion concentration 13 Using [Next], select Yes. 14 Confirm the Yes with g. 15 Finish the blank value determination with [ESC]. The - symbol no longer flashes. The displayed measured value is reduced by the blank value. The blank value correction is active until the blank value is switched off. 95

96 Ion concentration inolab ph/ion/cond Reference measurement (Ref. meas) A reference measurement enables you to assign the voltage value 0 mv to the calibration curve of your electrode for a specific ion concentration (reference concentration). Prerequisite:! The measured value display must show the voltage.! A valid calibration must be available. 1 Switch to the Display mode. 2 Only if no valid calibration is available (no sensor symbol on the measured value display): Perform a calibration (see section 7.3). 3 Switch to the display of the voltage (U) with m. 4 Switch to the Menu mode. 5 Use 46 to select the Meas main menu. 6 Select the ISE menu item with Confirm the ISE menu item with g. 8 Select the ISE setup menu item with Confirm the ISE setup menu item with g. 10 Select the Ref. meas menu item with Confirm the Ref. meas menu item with g. The Ref. meas function is active ( ). The + symbol flashes on the measured value display. 12 Switch to the measured value display with m. 13 Open the entry field for temperature and reference concentration with

97 inolab ph/ion/cond 750 Ion concentration 14 Using [Next], select the R entry field. 15 Enter the reference concentration R with Use [ESC] to leave the entry field. The measured voltage value is referred to the new reference concentration. 97

98 Ion concentration inolab ph/ion/cond Criterion for AutoRead (AutoRead) The AutoRead criteria affect the reproducibility of the measured values. The following criteria can be adjusted:! high: highest reproducibility! medium: medium reproducibility! low:lowest reproducibility Note Increasing reproducibility also causes the response time to increase until a measured value is evaluated as stable. 1 Switch to the Menu mode. 2 Use 46 to select the Meas main menu. 3 Select the ISE menu item with Confirm the ISE menu item with g. 5 Select the ISE setup menu item with Confirm the ISE setup menu item with g. 7 Select the AutoRead... menu item with Confirm the AutoRead... menu item with g. The setting of the criterion for AutoRead opens. 9 Select the setting for AutoRead with Using [ESC], leave the setting for AutoRead. The setting of the criterion for AutoRead is active. 98

99 inolab ph/ion/cond 750 Ion concentration 7.3 Calibration for ion-selective measurements Why calibrate? Ion-selective electrodes age and are temperaturedependent. This changes the slope. Calibration determines the current value of the slope of the electrode and stores it in the instrument. Thus, you should calibrate before each measurement and at regular intervals. Note For calibration, use tempered standard solutions with a temperature that differs by a max. of ± 2 C from the temperature of the test sample. When to calibrate? ISECal AutoRead Display of ISE temp? Display of ISE limit?! Before any concentration measurement if possible! After connecting another electrode! When the sensor symbol flashes after a voltage disconnection, e.g. battery change This is the conventional two-point to six-point calibration procedure that uses 2 to 6 freely selectable standard solutions. The concentration expected in the measurement determines the concentration of the calibration standards to be selected. The calibration procedure automatically activates the AutoRead function. In order to accept the current measured value without waiting for the end of the AutoRead function, simply press g. If you are using a temperature sensor, any temperature deviation (± 2 C) of the standard solutions that is too large is signaled by the display indicator, ISE temp?. The ISE limit? display indicator indicates that the selected calibration standards are too close to each other. 99

100 Ion concentration inolab ph/ion/cond 750 Calibration record The calibration record contains the calibration data of the current calibration. You can call up the calibration record by recalling the data memory (section 9.3). Note You can automatically print a calibration record following calibration. To do so, switch on the printer before calibrating (print LED lights up green). After a valid calibration, the record is printed. Sample printout: Calibration ISE Cal date : Cal time : 22:46 ISE Cal Tman Std mg/l Std mg/l C mv 23 C C mv 23 C S 58.7 mv Probe +++ User: xxxxx Electrode evaluation After the calibration, the meter evaluates the current status of the electrode. At the same time, the slope S (in mv) is evaluated. The evaluation appears on the display as the electrode evaluation. Display E3 Slope [mv] Eliminate the error according to chapter 6 WHAT TO DO IF

101 inolab ph/ion/cond 750 Ion concentration Preparatory activities Perform the following preparatory activities: 1 Switch on the meter with e. 2 Connect the electrode to the meter. 3 Connect a temperature sensor to the meter so that any temperature differences that are too high will be indicated during calibration. 4 Keep the standard solutions ready. 5 Adjust the temperature of the standard solutions. 6 Switch to the Menu mode. 7 Use 46 to select the Meas main menu. 8 Select the ISE menu item with Confirm the ISE menu item with g. The measured parameter ISE appears on the display ( ). Note For calibration, use tempered standard solutions with a temperature that differs by a max. of ± 2 C from the temperature of the test sample. 101

102 Ion concentration inolab ph/ion/cond 750 Use different standard solutions for this. The standard solutions have to be selected in either increasing or decreasing order. Standard solution Values [mg/l] Std ; 0.02; 0.05; 0.1; 0.2; 0.5; 1; 2; 5; 10; 20; 50; 100; 200; 500; 1000 Note The measurement precision is also dependent on the selected standard solutions. Therefore, the selected standard solutions should cover the expected value range of the subsequent concentration measurement. Two-point calibration 1 Perform the preparatory activities. 2 Switch to the ISE display with m and/or Press the c key. A field to select the concentration of the first standard solution is displayed. 4 Use 82 to enter the concentration of the first standard solution. 5 Immerse the electrode in standard solution 1. 6 Press the g key. The electrode voltage is displayed and the h display indicator flashes. 102

103 inolab ph/ion/cond 750 Ion concentration 7 If necessary, set the temperature of the standard solution with 82 (see section 5.5.2). 8 As soon as a stable value is reached, h stops flashing and the field to input the concentration of the second standard solution appears. 9 Use 82 to enter the concentration of standard solution Thoroughly rinse the electrode with deionized water. 11 Immerse the electrode in standard solution Press the g key. The electrode voltage is displayed and the h display indicator flashes. 103

104 Ion concentration inolab ph/ion/cond If necessary, set the temperature of the standard solution with 82 (see section 5.5.2). 14 As soon as a stable value is achieved, the h display stops flashing. The slope (mv) of the electrode after two-point calibration is displayed. The sensor symbol shows the electrode evaluation after two-point calibration. 15 Use m to finish the calibration. or Switch to three-point to six-point calibration with g. Note The calibration line after two-point calibration is determined by linear regression. The values of the two-point calibration are then stored. Three-point to six-point calibration 16 Press the g key. The previously set concentration of the third standard solution appears on the display. 104

105 inolab ph/ion/cond 750 Ion concentration 17 Use 82 to enter the concentration of standard solution Thoroughly rinse the electrode with deionized water. 19 Immerse the electrode in standard solution Press the g key. The electrode voltage is displayed and the h display indicator flashes. 21 If necessary, set the temperature of the standard solution with 82 (see section 5.5.2). 22 As soon as a stable value is achieved, the h display stops flashing. The slope (mv) of the electrode after two-point calibration is displayed. The sensor symbol shows the electrode evaluation after the previous calibration. 23 Use m to finish the calibration. or Switch to the four-point to six-point calibration with g. 105

106 Ion concentration inolab ph/ion/cond For carrying out a multipoint calibration: Repeat steps To return to the measuring mode: Press the m key. Note The calibration line is determined in sections. A straight line of the calibration is determined according to the Nernst equation between the highest and second highest calibration standard. Between the lowest and second lowest calibration standard, a calibration line is determined according to the Nernst equation modified by Nikolski. The Nikolski equation reproduces the real course of the characteristic curve of the electrode for the low concentration range. Note You can also terminate the calibration prematurely with m. The values of the previous calibration will then remain stored. 106

107 inolab ph/ion/cond 750 Ion concentration 7.4 Measuring the ion concentration Preparatory activities Perform the following preparatory activities when you want to measure the concentration using ion-sensitive electrodes: 1 Connect the electrode to the meter. 2 Adjust the temperature of the solutions, or measure the temperature if the measurement is made without a temperature sensor. 3 Select the ISE measuring mode. 4 Calibrate or check the meter using the ion-sensitive electrode. Note Incorrect calibration of ion-sensitive electrodes will result in incorrect measured values. Calibrate regularly before measuring. Temperature sensor For reproducible measurements it is essential to determine the corresponding temperature value. The meter receives the temperature value from:! an external temperature sensor NTC30 or Pt1000 (see section TEMPERATURE MEASUREMENT)! an integrated temperature sensor of another sensor, e.g. of a conductivity measuring cell (see section TEMPERATURE MEASUREMENT)! manual input of the temperature value The used temperature sensor is indicated on the display by v or z. 107

108 Ion concentration inolab ph/ion/cond 750 Note The meter automatically recognizes the type of the temperature sensor used. If the measurement is made without a temperature sensor, proceed as follows: 1 Measure the current temperature of the test sample. 2 Adjust the temperature of the test sample and the calibration standards to the same temperature (maximum deviation: ± 2 C). Measuring the concentration Measure the concentration as follows: 1 Perform the preparatory activities according to section Immerse the electrode in the test sample. 3 Press the m key until ISE appears. The concentration value appears on the display. AutoRead (drift control) The AutoRead function (drift control) checks the stability of the measurement signal. The stability has a considerable effect on the reproducibility of the measured value. The AutoRead criterion is adjustable (see section 7.2.4). 1 Call up the ISE measuring mode with m. 2 Immerse the electrode in the test sample. 3 Activate the AutoRead function with a. The current measured value is frozen. 108

109 inolab ph/ion/cond 750 Ion concentration 4 Start AutoRead with g. h flashes until a stable measured value is reached. The stable measured value is transmitted to the printer or interface. 5 If necessary, start the next AutoRead measurement with g. 6 To terminate the AutoRead function: Press the a key. Note Before accepting a measured value, make sure that it is stable for a longer period of time. In order to accept the current measured value without waiting for the end of the AutoRead function, press g. 109

110 Ion concentration inolab ph/ion/cond Selecting the measuring method The following methods are supported:! Standard addition (Std. add.)! Double standard addition (Std. add. ++)! Standard subtraction (Std. sub.)! Sample addition (Smp. add.)! Sample subtraction (Smp. sub.)! Blank addition (Blank add.) 1 Switch on the meter with e. 2 Connect the electrode to the meter. 3 Connect a temperature sensor to the meter so that any temperature differences that are too high will be indicated during calibration. 4 Keep the standard solutions ready. 5 Adjust the temperature of the standard solutions. 6 Switch to the Menu mode. 7 Use 46 to select the Meas main menu. 8 Select the ISE menu item with Confirm the ISE menu item with g. The ISE measured parameter appears on the display ( ). 10 Select the ISE ext. menu item with

111 inolab ph/ion/cond 750 Ion concentration 11 Confirm the ISE ext. menu item with g. The menu with the measuring methods opens. 12 Select a method with Confirm the method with g. Measurement with the selected method begins Standard addition (Std. add.) In the Standard addition procedure, a known amount of standard solution is added to the sample. The ion concentration in the sample is calculated from the change in potential. 1 Select the measuring method (see section 7.4.1). 2 Prepare two standard calibration solutions. 3 Perform a two-point calibration according to the user guidance. 4 As soon as a stable value for the second standard calibration solution is achieved, the h display stops flashing. The slope (mv) of the electrode after two-point calibration is displayed. The sensor symbol shows the electrode evaluation after two-point calibration. 111

112 Ion concentration inolab ph/ion/cond 750 Measuring 5 Start the measurement with [Start]. A window for the entry of data opens. 6 Using 82 and [Next], enter Sample volume and ISA/TISAB volume. 7 Thoroughly rinse the electrode with deionized water. 8 Immerse the electrode in the sample. 9 Start the measurement with [Start]. 10 Add the standard solution to the sample. 11 Start the measurement with [Start]. A window for the entry of data opens. 112

113 inolab ph/ion/cond 750 Ion concentration 12 Using 82 and [Next], enter the standard volume (Std. volume), standard concentration (Std. conc.) and Ion type. 13 Terminate the measurement with [Start]. 14 Start a new measurement with [Next]. 15 Repeat steps 7-13 for all samples. 16 Terminate the measurement with [ESC]. A security prompt appears. 17 Using [Next], select Yes. 18 Confirm the Yes with g. Terminate the measurement. 113

114 Ion concentration inolab ph/ion/cond Double standard addition (Std. add. ++) In the Double standard addition procedure, a known amount of standard solution is added to the sample in two steps. First, one percent of the sample volume is added, then 2 percent of the sample volume is added. The ion concentration in the sample is calculated from the change in potential between the first and second addition of standard solution. Measuring 1 Start the measurement with [Start]. A window for the entry of data opens. 2 Using 82 and [Next], enter Sample volume and ISA/TISAB volume. 3 Thoroughly rinse the electrode with deionized water. 4 Immerse the electrode in the sample. 5 Start the measurement with [Start]. 6 Add standard solution (1 Vol.% of the sample solution). 114

115 inolab ph/ion/cond 750 Ion concentration 7 Start the measurement with [Start]. A window for the entry of data opens. 8 Using 82 and [Next], enter the standard volume, standard concentration and Ion type. 9 Continue the measurement with [Start]. 10 Add the standard solution (2 Vol% of the sample solution). 11 Continue the measurement with [Start]. 12 Start a new measurement with [Next]. 13 Repeat steps 1-12 for all samples. 115

116 Ion concentration inolab ph/ion/cond Terminate the measurement with [ESC]. A security prompt appears. 15 Using [Next], select Yes. 16 Confirm the Yes with g. The measurement is terminated. 116

117 inolab ph/ion/cond 750 Ion concentration Standard subtraction (Std. sub.) In the Standard subtraction procedure, a known amount of standard solution is added to the sample (as complexing agent or precipitating agent) and, thus, the ion concentration lowered. The ion concentration in the sample is calculated from the change in potential. 1 Select the measuring method (see section 7.4.1). 2 Prepare two standard calibration solutions. 3 Perform a two-point calibration according to the user guidance. 4 As soon as a stable value for the second standard calibration solution is achieved, the h display stops flashing. The slope (mv) of the electrode after two-point calibration is displayed. The sensor symbol shows the electrode evaluation after two-point calibration. Measuring 5 Start the measurement with [Start]. A window for the entry of data opens. 117

118 Ion concentration inolab ph/ion/cond Using 82 and [Next], enter Sample volume and ISA/TISAB volume. 7 Thoroughly rinse the electrode with deionized water. 8 Immerse the electrode in the sample. 9 Start the measurement with [Start]. 10 Add the standard solution to the sample. 11 Start the measurement with [Start]. A window for the entry of data opens. 118

119 inolab ph/ion/cond 750 Ion concentration 12 Using 82 and [Next], enter the standard volume (Std. volume), standard concentration (Std. conc.) and Ion type for the test sample (#1) and standard solution (#2). 13 For the entry of a self-defining type of ion (??):! Select the?? entry for the ion in the sample (#1) with 82.! Set the valency and molecular weight for the ion in the sample with [Next] and 82.! Select the?? entry for the ion in the standard solution (#2) with [Next] and 82.! Set the valency and molecular weight for the ion in the standard solution with [Next] and Terminate the measurement with [Start]. 15 Start a new measurement with [Next]. 16 Repeat steps for all samples. 17 Terminate the measurement with [ESC]. A security prompt appears. 18 Using [Next], select Yes. 19 Confirm the Yes with g. The measurement is terminated. 119

120 Ion concentration inolab ph/ion/cond Sample addition (Smp. add.) In the Sample addition procedure, a known amount of test sample is added to the standard solution. The ion concentration in the sample is calculated from the change in potential. 1 Select the measuring method (see section 7.4.1). 2 Prepare two standard calibration solutions. 3 Perform a two-point calibration according to the user guidance. 4 As soon as a stable value for the second standard calibration solution is achieved, the h display stops flashing. The slope (mv) of the electrode after two-point calibration is displayed. The sensor symbol shows the electrode evaluation after two-point calibration. Measuring 5 Start the measurement with [Start]. The entry window for Standard volume, Standard concentration and ISA volume opens. 120

121 inolab ph/ion/cond 750 Ion concentration 6 Enter the standard volume, standard concentration and ISA volume with 82 and [Next]. 7 Thoroughly rinse the electrode with deionized water. 8 Immerse the electrode in the standard. 9 Start the measurement with [Start]. 10 Add the sample to the standard solution. 11 Start the measurement with [Start]. 12 Enter the standard volume, standard concentration and ISA volume with 82 and [Next]. 13 Terminate the measurement with [Start]. 121

122 Ion concentration inolab ph/ion/cond Start a new measurement with [Next]. 15 Repeat steps 5-14 for all samples. 16 Terminate the measurement with [ESC]. A security prompt appears. 17 Using [Next], select Yes. 18 Confirm the Yes with g. The measurement is terminated Sample subtraction (Smp. sub.) In the Sample subtraction procedure, a known amount of test sample is added to the standard solution. The ion concentration in the sample is calculated from the change in potential. The sample subtraction is one method for the indirect determination of ions. It is used for the determination of ions for which no direct determination is possible. 1 Select the measuring method (see section 7.4.1). 122

123 inolab ph/ion/cond 750 Ion concentration 2 Prepare two standard calibration solutions. 3 Perform a two-point calibration according to the user guidance. 4 As soon as a stable value for the second standard calibration solution is achieved, the h display stops flashing. The slope (mv) of the electrode after two-point calibration is displayed. The sensor symbol shows the electrode evaluation after two-point calibration. Measuring 5 Start the measurement with [Start]. The entry for standard volume, standard concentration and ISA volume with 82 and [Next] opens up. 6 Enter the standard volume, standard concentration and ISA volume with 82 and [Next]. 7 Thoroughly rinse the electrode with deionized water. 8 Immerse the electrode in the standard solution. 9 Start the measurement with [Start]. 123

124 Ion concentration inolab ph/ion/cond Add the standard solution to the sample. 11 Start the measurement with [Start]. 12 Using 82 and [Next], enter the Sample volume and Ion type for the test sample (#1) and standard solution (#2). 13 For the entry of a self-defined type of ion (??):! Select the?? entry for the ion in the sample (#1) with 82.! Set the valency and molecular weight for the ion in the sample with [Next] and 82.! Select the?? entry for the ion in the standard solution (#2) with [Next] and 82.! Set the valency and molecular weight for the ion in the standard solution with [Next] and Terminate the measurement with [Start]. 124

125 inolab ph/ion/cond 750 Ion concentration 15 Start a new measurement with [Next]. 16 Repeat steps 5-15 for all samples. 17 Terminate the measurement with [ESC]. A security prompt appears. 18 Using [Next], select Yes. 19 Confirm the Yes with g. The measurement is terminated. 125

126 Ion concentration inolab ph/ion/cond Standard addition with blank value correction (Blank add.) In the "Standard addition with blank value correction" procedure, a known amount of standard solution is added to the sample in two steps. The ion concentration in the linear range of the electrode characteristic curve is increased with the first addition. The second addition is equivalent to the standard addition. The ion concentration in the sample is calculated from the change in potential. 1 Select the measuring method (see section 7.4.1). 2 Prepare two standard calibration solutions. 3 Perform a two-point calibration according to the user guidance. 4 As soon as a stable value for the second standard calibration solution is achieved, the h display stops flashing. The slope (mv) of the electrode after two-point calibration is displayed. The sensor symbol shows the electrode evaluation after two-point calibration. 126

127 inolab ph/ion/cond 750 Ion concentration Measuring 5 Start the measurement with [Start]. A window for the entry of data opens. 6 Using 82 and [Next], enter the volume of the test sample (Smp. vol.), volume of the ISA solution (ISA vol.), volume of the blank value solution (BV vol. and concentration of the blank value solution (BV conc.). 7 Thoroughly rinse the electrode with deionized water. 8 Immerse the electrode in the sample supplemented with the blank value. 9 Start the measurement with [Start]. 10 Add the standard solution to the sample. 11 Start the measurement with [Start]. 127

128 Ion concentration inolab ph/ion/cond Using 82 and [Next], enter the volume of the standard solution (Std. volume), concentration of the standard solution (Std. conc.) and Ion type. 13 Terminate the measurement with [Start]. 14 Start a new measurement with [Next]. 15 Repeat steps 5-14 for all samples. 16 Terminate the measurement with [ESC]. A security prompt appears. 17 Using [Next], select Yes. 18 Confirm the Yes with g. The measurement is terminated. 128

129 inolab ph/ion/cond 750 Conductivity 8 Conductivity 8.1 Settings for conductivity measurements In order to achieve comparable and reproducible measuring results, we recommend to check and, if necessary, correct the current settings before measuring Determining the measuring range You can select the measuring range manually or automatically. We recommend to set the measuring range manually when the intended measurement is downloaded to a recorder at the same time. You can determine the measuring range for measuring the conductivity as follows:! Automatic switch-over of the measuring range (AutoRng)! Manual selection between the following ranges with the following resolution: µs (when using LR001), 0.01 µs (when using LR01), 0.1 µs/cm, 1 µs/cm, 0.01 ms/cm, 0.1 ms/cm, 1 ms/cm! Manual selection between the following ranges of the specific resistance with the following resolution: kωcm, 0.01 kωcm, 0.1 kωcm, 1 kωcm, 0.01 MΩcm, 0.1 MΩcm, 1 MΩcm! Measuring the salinity (Sal) and the total dissolved solids (TDS) Note If you are using a recorder, we recommend to deactivate the AutoRange function. Specify the expected range manually. Otherwise, the recorder scaling will change to a different range due to the switch-over. 129

130 Conductivity inolab ph/ion/cond 750 Manual selection of the measuring range The AutoRng function has to be switched off for the manual selection of the measuring range. 1 Switch to the Display mode. 2 Use 46 to select the required range or Sal or TDS. Automatic measuring range switch over (AutoRng) 1 Switch to the Menu mode. 2 Use 46 to select the Meas main menu. 3 Select the Cond setup menu item with Confirm the Cond setup menu item with g. 5 Select the AutoRng menu item with Confirm the AutoRng menu item with g. i appears on the display. 7 Terminate the Menu mode with m. 130

131 inolab ph/ion/cond 750 Conductivity Selecting the reference temperature The following reference temperatures are selectable:! TRef25: T Ref = 25 C! TRef20: T Ref = 20 C! TRefvar: adjusted reference temperature The adjustable reference temperature (TRefvar) is only available if a measuring method with adjustable reference temperature is active. The reference temperature is adjusted during the course of the measurement with the selected method, e.g. TC nlin2. 1 Switch to the Menu mode. 2 Use 46 to select the Meas main menu. 3 Select the Cond setup menu item with Confirm the Cond setup menu item with g. 5 Select the TRef menu item with Confirm the TRef menu item with g. 7 Select a reference temperature with Confirm the selected reference temperature with g. With TRefvar, the temperature that was last adjusted is displayed. 9 Terminate the Menu mode with m. When displaying the measured parameter, conductivity, ( display. ) 5, 0 or : appears on the 131

132 Conductivity inolab ph/ion/cond Displaying the conductivity or specific resistance You can select the display of the conductivity (in S/cm) or specific resistance (in MΩ cm). 1 Switch to the Menu mode. 2 Use 46 to select the Meas main menu. 3 Select the Cond setup menu item with Confirm the Cond setup menu item with g. 5 Select the Cond MOhm menu item with Confirm the Cond MOhm menu item with g. The conductivity is displayed in the unit, MΩ cm. 7 Terminate the Menu mode with [ESC]. 132

133 inolab ph/ion/cond 750 Conductivity Reset (Reset) You can reset (initialize) the settings for the conductivity measurement. In a reset, the following functions for the conductivity measurement are reset to the default settings: Measuring mode Cell constant (c) Temperature compensation Reference temperature Temperature coefficient (TC) of the linear temperature compensation cm -1 (calibrated) cm -1 (set up) nlf TRef25 TDS factor %/K 1 Switch to the Menu mode. 2 Use 46 to select the Cal main menu. 3 Select the Reset Cond menu item with Confirm the Reset Cond menu item with g. The default settings for conductivity measurements are restored. The Menu mode is finished. Note The calibration data will be lost in a reset. Recalibrate after performing a reset. 133

134 Conductivity inolab ph/ion/cond Determining/setting the temperature compensation The conductivity of aqueous solutions is mainly caused by the temperature and concentration of dissolved substances. Reference temperature Temperature compensation To compare measured values that were determined at different temperatures they have to be converted to a reference temperature. Thus, a conductivity specification includes a temperature specification as a matter of principle. The temperature compensation is used to calculate the conductivity at the reference temperature from a conductivity value that was measured at any temperature. To do so, the temperature dependency (linear or nonlinear) of the conductivity for the solution must be known. The conductivity of most diluted aqueous salt solutions and natural water changes approximately linearly with the temperature. The conductivity of most other diluted solutions changes nonlinearly with the temperature. The characteristics of the test sample indicate which procedure is suitable for temperature compensation. # Characteristics of the test sample! diluted! small temperature range! diluted! wide temperature range! concentrated! wide temperature range! wide concentration range! wide temperature range Procedure for temperature compensation linear (Set TC lin) nonlinear (TC nlf) nonlinear (TC nlin1...2) nonlinear (TC nlin3, TC nlin4) 134

135 inolab ph/ion/cond 750 Conductivity For diluted test samples, linear and nonlinear temperature dependencies are stored in the meter. For other test samples the inolab ph/ion/cond 750 provides the option of determining the temperature dependency and, if necessary, the concentration dependency of the conductivity as well. Temperature compensation for diluted solutions For the measurement of aqueous solutions! in a low concentration range (diluted solution)! in a small temperature range ( T - Tref < 10 K)! with a fixed reference temperature at 20 C or 25 C the procedures of linear (TC lin) and nonlinear (TC nlf) temperature compensation are suitable. Test sample Natural water (ground water, surface water, drinking water) Ultrapure water Salinity (seawater) Procedure for temperature compensation nlf EN nlf EN Automatically nlf according to IOT Display indicator n n k, n Other diluted aqueous solutions linear temperature compensation; temperature coefficient adjustable in the range of %/K q 135

136 Conductivity inolab ph/ion/cond 750 Temperature compensation for concentrated solutions For the measurement of aqueous solutions! in a wide concentration range! in a wide temperature range ( T - Tref > 10 K)! with freely adjustable reference temperature procedures with an individually determined nonlinear temperature compensation are suitable (designation: TC nlin1... 4). The temperature compensation procedures have different ways of determining the temperature and concentration dependency. Procedure TC nlin1 TC nlin2 TC nlin3 TC nlin4 Determining the temperature dependency (and concentration dependency) Temperature coefficients (e.g. from further reading) can be selected and entered manually.! with one standard with known concentration! at different temperatures! with several standards with known concentrations! at different temperatures! with several standards with unknown concentrations (produced by equidistant dilution)! at different temperatures Note These procedures are, for example, used for the monitoring of industrial processes. Note The concentration of the test sample is determined with the TC nlin3 procedure, the conductivity is determined with the TC nlin4 procedure. 136

137 inolab ph/ion/cond 750 Conductivity Selecting the nonlinear temperature compensation TC nlf 1 Switch to the Menu mode. 2 Use 46 to select the Meas main menu. 3 Select the TC nlf menu item with Confirm the selected menu item with g. The temperature compensation is active ( ). 5 Terminate the Menu mode with m. 137

138 Conductivity inolab ph/ion/cond Selecting the linear temperature compensation TC lin The temperature coefficient for the linear temperature compensation is adjustable in the range of coefficients from %/K. The nonlinear temperature compensation is carried out according to the following equation: X Tref = X T / (1 + [TC/100] [T-TRef]) X T = conductivity at temperature T [S/cm] X Tref = conductivity at reference temperature Tref [S/cm] TC = temperature coefficient [%/K] T = temperature [ C] Tref = reference temperature [ C] 1 Switch to the Menu mode. 2 Use 46 to select the Cal main menu. 3 Select the Cal TC menu item with Confirm the selected menu item with g. The selection of the temperature coefficients opens up. 5 Select the Set TC lin... menu item with

139 inolab ph/ion/cond 750 Conductivity 6 Confirm the selected menu item with g. The entry field for the temperature coefficient opens up. 7 Option: Move between the individual digits with Using 82, set the temperature coefficient in the range %/K. 9 With [ESC] accept the adjusted temperature coefficient and exit the Menu mode. 139

140 Conductivity inolab ph/ion/cond Selecting and adjusting the nonlinear temperature compensation TC nlin1 The nonlinear temperature compensation is carried out according to the following equation: X Tref = X T / (1 + TC 1 [T-TRef] + TC 2 [T-TRef] 2 ) X T = conductivity at temperature T [S/cm] X Tref = conductivity at reference temperature Tref [S/cm] TC 1 = temperature coefficient 1 [1/ C] TC 2 = temperature coefficient 2 [1/ C 2 ] T = temperature [ C] Tref = reference temperature [ C] The equation includes two temperature coefficients, TC 1 and TC 2. In the inolab ph/ion/cond 750 meter, the temperature coefficients TC 1 and TC 2 are stored for the following test samples: Concentration c [mol/l] Temperature range [ C] HCl NaOH NaCl KCl 1,0 0,67 0,85 0, Tref [ C] Suitable temperature coefficients TC 1 and TC 2 for solutions that are not mentioned here can be taken from tables found in further reading and entered in the meter. 140

141 inolab ph/ion/cond 750 Conductivity 1 Switch to the Menu mode. 2 Use 46 to select the Cal main menu. 3 Select the Cal TC menu item with Confirm the selected menu item with g. The selection of the temperature coefficients opens up. 5 Select the TC nlin1... menu item with Confirm the selected menu item with g. The window for the selection of the test sample opens up. 7 Using 82, select a test sample with permanently stored coefficients (NaCl, KCl, NaOH, HCl) or the freely adjustable coefficients (variable). The stored temperature coefficients are displayed during the selection of the test sample. Freely selectable temperature coefficients Solution variable Permanently stored temperature coefficients, e.g. Solution KCl 141

142 Conductivity inolab ph/ion/cond With freely selectable temperature coefficients only: Switch to the entry field for the temperature coefficient with g or [Next]. 9 With freely selectable temperature coefficients only: Using 82 and [Next] select each temperature coefficient with its exponent (unit: 1/ C) 10 Using [Ok] accept the setting and exit the Menu mode. 142

143 inolab ph/ion/cond 750 Conductivity Selecting and determining the nonlinear temperature compensation TC nlin2 1 Switch to the Menu mode. 2 Use 46 to select the Cal main menu. 3 Select the Cal TC menu item with Confirm the selected menu item with g. A submenu with selectable temperature compensation procedures opens up. 5 Select the TC nlin2... menu item with Confirm the selected menu item with g. The Cal Temp Coeff entry window opens up. 7 Enter the data with 82 and [Next].! Tstart: Start of the temperature range! Tend: End of the temperature range! TStep: Temperature interval that is used to store the temperature and conductivity value to determine the temperature coefficient from T start.! TRef: Entry of a reference temperature 143

144 Conductivity inolab ph/ion/cond 750 Note The measuring method can only be started if T Ref, T start and T Step are selected so that the reference temperature corresponds to the nominal temperature of a measuring point: T Ref = T start + x*t Step. 8 Warm or cool the test sample to the start temperature Tstart. 9 Immerse the measuring cell in the test sample. 10 Start measuring the temperature dependency with [Start]. The display shows:! the current conductivity value (885 µs/cm)! the current temperature (13 C)! the next measuring point with the corresponding nominal temperature (MP1 = 15 C)! the temperature difference between the current temperature and the nominal temperature ([d = -2 C]) 11 Warm or cool the test sample until the end temperature T end is achieved. Each time the nominal temperature for a measuring point is reached a dataset is stored. The end of the calibration is displayed. If the calibration is successful, the determined temperature dependency for the TC nlin2 method is stored and used for further measurements with this method. 144

145 inolab ph/ion/cond 750 Conductivity Selecting and determining the nonlinear temperature compensation TC nlin3 1 Switch to the Menu mode. 2 Use 46 to select the Cal main menu. 3 Select the Cal TC menu item with Confirm the selected menu item with g. A submenu with selectable temperature compensation procedures opens up. 5 Select the TC nlin3... menu item with Confirm the selected menu item with g. The Cal Temp Coeff entry window opens up. 7 Enter the data with 82 and [Next].! Tstart: Start of the temperature range! Tend: End of the temperature range! TStep: Temperature interval that is used to store the temperature and conductivity value to determine the temperature coefficient from Tstart.! Conc. number: Number of standard solutions with different concentrations 145

146 Conductivity inolab ph/ion/cond 750 Note The measuring method can only be started if T Ref, T start and T Step are selected so that the reference temperature corresponds to the nominal temperature of a measuring point: T Ref = T start + x*t Step 8 Enter the data of all standard solutions (1 to x) with 82 and [Next].! [1]: number of the standard solution! 0.000: concentration that belongs to the number of the standard solution! ppm: unit of the concentration of the standard solution 9 Warm or cool the test sample to the start temperature Tstart. 10 Immerse the measuring cell in the test sample. 11 Start measuring the temperature dependency with [Start]. The display shows:! the current conductivity value (885 µs/cm)! the current temperature (13 C)! the next measuring point with the corresponding nominal temperature (MP1 = 15 C)! the temperature difference between the current temperature and the nominal temperature ([d = -2 C]) 146

147 inolab ph/ion/cond 750 Conductivity 12 Warm or cool the test sample until the end temperature T end is achieved. Each time the nominal temperature for a measuring point is reached a dataset is stored. 13 Repeat step 9-12 for all other standard solutions. The end of the calibration for a standard solution is displayed. Note It is possible to prematurely finish calibration with the [End] softkey if the conductivity value at the reference temperature and at least one further conductivity value were determined. After finishing calibration no more temperature measuring points of the current standard are measured. For the next standard, temperature measuring points are only offered up to the last temperature measuring point with assigned conductivity value. For a valid calibration that can be stored, at least two temperature measuring points for at least two standards are required. 14 After successful calibration the Store TC data? query appears. Select Yes with [Next] and confirm with g. Thus, the determined temperature dependency for the TC nlin3 method is stored and used for further measurements with this method. 147

148 Conductivity inolab ph/ion/cond Selecting and determining the nonlinear temperature compensation TC nlin4 Preparatory activities The nonlinear temperature compensation TC nlin4 is determined from several standards with unknown concentration. Prepare the required standards yourself by diluting the standard with the highest concentration at equal spacings, e.g.: Standard with the highest concentration Volume share in % Deionized water Volume share in % Standard Standard Standard Standard Standard Determining the temperature compensation 1 Switch to the Menu mode. 2 Use 46 to select the Cal main menu. 3 Select the Cal TC menu item with Confirm the selected menu item with g. A submenu with selectable temperature compensation procedures opens up. 5 Select the TC nlin4... menu item with

149 inolab ph/ion/cond 750 Conductivity 6 Confirm the selected menu item with g. The Cal Temp Coeff entry window opens up. 7 Enter the data with 82 and [Next].! Tstart: Start of the temperature range! Tend: End of the temperature range! TStep: Temperature interval that is used to store the temperature and conductivity value to determine the temperature coefficient from T start.! TRef: Entry of a reference temperature.! Conc. number: Number of standard solutions with different, equidistant concentrations Note The measuring method can only be started if T Ref, T start and T Step are selected so that the reference temperature corresponds to the nominal temperature of a measuring point: T Ref = T start + x*t Step. 149

150 Conductivity inolab ph/ion/cond Warm or cool the test sample to the start temperature Tstart. 9 Immerse the measuring cell in the test sample. 10 Start measuring the temperature dependency with [Start]. The display shows:! the current conductivity value (885 µs/cm)! the current temperature (13 C)! the next measuring point with the corresponding nominal temperature (MP1 = 15 C)! the temperature difference between the current temperature and the nominal temperature ([d = -2 C]) 11 Warm or cool the test sample until the end temperature T end is achieved. Each time the nominal temperature for a measuring point is reached a dataset is stored. The end of the calibration is displayed. 12 Repeat step 8-12 for all other standard solutions. The end of the calibration for a standard solution is displayed. Note It is possible to prematurely finish calibration with the [End] softkey if the conductivity value at the reference temperature and at least one further conductivity value was determined. 150

151 inolab ph/ion/cond 750 Conductivity No further temperature measuring points of the current standard are measured. For the next standard, temperature measuring points are only offered up to the last temperature measuring point with assigned conductivity value. For a valid calibration to be stored, at least two temperature measuring points for at least two standards are required. 13 After successful calibration the Store TC data? query appears. Select Yes with [Next] and confirm with g. Thus, the determined temperature dependency for the TC nlin4 method is stored and used for further measurements with this method. 151

152 Conductivity inolab ph/ion/cond Switching off the temperature compensation 1 Switch to the Menu mode. 2 Use 46 to select the Meas main menu. 3 Select the TC off menu item with Confirm the selected menu item with g. The temperature compensation is switched off ( ). 5 Terminate the Menu mode with m. 152

153 inolab ph/ion/cond 750 Conductivity 8.3 Determining/setting up the cell constant Why determine/set up the cell constant? Aging slightly changes the characteristics of the cell, e. g. by coatings. As a result, an inexact measured value is displayed. The original characteristics of the cell can often be restored by cleaning the cell. Calibration determines the current cell constant and stores it in the meter. Thus, you should calibrate at regular intervals (we recommend: every 6 months). You can determine the actual cell constant of the conductivity measuring cell by calibrating with the control standard in the following ranges:! cm -1 (e.g. TetraCon, nominal cell constant 0.475)! cm -1 (cells with a cell constant of approx. 1) Calibration is not required for the fixed cell constant of 0.01 cm -1. Cell constants outside the ranges mentioned above cannot be calibrated Determining the cell constant (calibration) Note This method of automatically determining the cell constant by calibration with the 0.01 mol/l KCL standard solution can only be used for measuring cells with cell constants in the range cm -1 or cm -1. Note If error message E3 appears refer to chapter 12 WHAT TO DO IF

154 Conductivity inolab ph/ion/cond 750 Calibration procedure To determine the cell constant, you need a 0.01 mol/l KCl calibration solution. 1 Start the determination of the cell constant with c. 2 Immerse the measuring cell in the prepared calibration solution. 3 Press the g key in order to start the measurement with AutoRead to determine the cell constant. The h display indicator flashes until a stable signal is reached. The cell constant determined is displayed. 4 Return to the measuring mode with g or m. 154

155 inolab ph/ion/cond 750 Conductivity Calibration evaluation After calibrating, the meter automatically evaluates the calibration. The evaluation appears on the display. Display Cell constant [cm -1 ] cm -1 E3 Perform error elimination according to chapter 12 WHAT TO DO IF cm -1 outside the ranges cm -1 or cm

156 Conductivity inolab ph/ion/cond 750 Calibration record The meter automatically stores the cell constant in the calibration record. The last calibration record can be displayed at any time with the aid of the Cal rec.... function in the Cal menu (see section 9.3). Note You can automatically print a calibration record after the calibration. To do so, switch on the printer before calibrating (print LED lights up green). After a valid calibration, the record is printed. Sample printout: Calibration Conductivity Cal date : Cal time : 22:46 Cal interval : 180 days Cal standard: 0.01 mol/l KCL Conductivity/Tref25: 1413 us/cm Cell constant : /cm Probe +++ User: xxxxx Calibration interval The calibration interval is used to determine after how many days you want to be reminded that a conductivity calibration is due. 1 Switch to the Menu mode. 2 Use 46 to select the Cal main menu. 3 Select the Cal int. menu item with Confirm the Cal int... menu item with g. The entry field for the calibration interval appears. 156

157 inolab ph/ion/cond 750 Conductivity 5 Option: Select a digit with Set the required interval (days) with Confirm the calibration interval entered with g. 8 Use [ESC] to leave the entry field Setting the cell constant Note The cell constant to be set must either be taken from the operating manual of the measuring cell or is printed on the measuring cell. The inolab 3 meter offers the following possibilities of setting the cell constant:! Accepting the cell constant from the last calibration record (Cal cell)! Selecting any cell constant within the range to cm -1 (Man cell)! Selecting any cell constant within the range to cm -1 (Man LR01)! Selecting the fixed cell constant cm -1 (LR001) Note The last calibration record can be displayed at any time with the aid of the Cal rec.... function in the Cal menu (see section 9.3 MEMORY OF CALIBRATION RECORDS). 157

158 Conductivity inolab ph/ion/cond 750 Accepting the cell constant of the calibration record Accept the cell constant of the last calibration record as follows: 1 Switch to the Menu mode. 2 Use 46 to select the Cal main menu. 3 Select the Use cell menu item with Confirm the Use cell menu item with g. 5 Select the Cal cell menu item with Confirm the Cal cell menu item with g. The cell constant of the last calibration is accepted. Cal cell is active ( ). 7 Terminate the Menu mode with m. 158

159 inolab ph/ion/cond 750 Conductivity Setting any cell constant within the range cm -1 You can set the cell constant manually in the range cm -1 as follows: 1 Switch to the Menu mode. 2 Use 46 to select the Cal main menu. 3 Select the Use cell menu item with Confirm the Use cell menu item with g. 5 Select the Man cell menu item with Confirm the Man cell menu item with g. The entry field for the cell constant opens. The current value is displayed. 7 Increase/reduce the value with Use [ESC] to leave the entry field. The selected cell constant is accepted. Man cell is active ( ). 9 Terminate the Menu mode with m. 159

160 Conductivity inolab ph/ion/cond 750 Setting any cell constant within the range cm -1 You can set the cell constant manually in the range cm -1 as follows: 1 Switch to the Menu mode. 2 Use 46 to select the Cal main menu. 3 Select the Use cell menu item with Confirm the Use cell menu item with g. 5 Select the Man LR01 menu item with Confirm the Man LR01 menu item with g. The entry field for the cell constant opens. The current value is displayed. 7 Increase/reduce the value with Use [ESC] to leave the entry field. The selected cell constant is accepted. Man LR01 is active ( ). 9 Terminate the Menu mode with m. 160

161 inolab ph/ion/cond 750 Conductivity Selecting the fixed cell constant cm -1 Set the cell constant to the fixed value of cm -1 as follows: 1 Switch to the Menu mode. 2 Use 46 to select the Cal main menu. 3 Select the Use cell menu item with Confirm the Use cell menu item with g. 5 Using 82, select the required cell constant LR001 (0.001 cm -1 ). 6 Using 82, select the required cell constant LR001 (0.001 cm -1 ). 7 Confirm the selected cell constant with g. The selected cell constant is active ( ). 8 Terminate the Menu mode with m. 161

162 Conductivity inolab ph/ion/cond Measuring the conductivity General information You can display the following measured parameters:! Conductivity/specific resistance (For details of how to switch over, see chapter 8.1 SETTINGS FOR CONDUCTIVITY MEASUREMENTS)! Salinity (Sal)! Total dissolved solids (TDS) Preparatory activities Perform the following preparatory activities when you want to measure: 1 Connect a conductivity measuring cell with temperature sensor to the meter. The instrument recognizes the measuring cell and automatically switches to the conductivity measuring mode that was last selected. If the conductivity measuring cell is already connected, press the m repeatedly until the conductivity measuring mode appears. 2 Check the selected cell constant or calibrate the meter with the measuring cell. How to calibrate is described in section DETERMINING THE CELL CONSTANT (CALIBRATION) from page Check the selected temperature compensation Displaying the conductivity, total dissolved solids (TDS) or salinity You can switch back and forth between the measured parameters, conductivity, TDS and salinity: 1 Perform the preparatory activities according to section Immerse the measuring cell in the test sample. 162

163 inolab ph/ion/cond 750 Conductivity 3 Press the 46 key until the measured parameter, conductivity ( ) appears. The measured value appears on the display. 4 Press the 46 keys repeatedly until the measured parameter Sal appears. The salinity value appears on the display. 5 Press the 46 keys repeatedly until the measured parameter TDS appears. The TDS value appears on the display. Note See also Application report CONDUCTOMETRICAL DETERMINATION OF THE TOTAL DISSOLVED SOLIDS (TDS). 163

164 Conductivity inolab ph/ion/cond Drift control (AutoRead) The drift control function (AutoRead) checks the stability of the measured value. The stability has a considerable effect on the reproducibility of the measured value. 1 Select the required measuring mode with Immerse the conductivity measuring cell in the test sample. 3 Activate the AutoRead function with a. The measured value is frozen (hold function). 4 Start the measurement with AutoRead by pressing g. The h display indicator flashes. When a stable signal is reached, an acoustic signal is heard and h stops flashing. 5 If necessary, start the next measurement with AutoRead by pressing g. 6 To terminate AutoRead: Press the a key. Note In order to accept the current measured value without waiting for the end of the AutoRead function, simply press g. You can only change to another measured parameter after completion of AutoRead. 164

165 inolab ph/ion/cond 750 Data memory 9 Data memory Data memory enables the storage and administration of measurement, configuration and calibration data. The following types of memory are available:! Memory of measurement datasets: This memory contains measurement datasets for subsequent processing or download (see section 9.1)! Memory of system configurations (settings): This memory enables you to save and recall individual configurations (see section 9.2)! Memory of calibration records: This memory contains all current calibration records (see section 9.3) 165

166 Data memory inolab ph/ion/cond Storage of measurement datasets Measurement dataset memory enables the storage of measurement datasets for subsequent processing or download. There are two methods of storing measurement datasets:! Manual storage of individual measurement datasets! Automatic storage of several measurement datasets A measurement dataset consists of:! Number of the memory location (Mem no.)! Date/time! Identification (ID)! Measured values (e.g. ph and temperature value) with status information To find datasets easily, Mem no., name (ID) and date/time are available as filter criteria. The identification (ID), which you allocate yourself, can be especially useful when doing this (see section 9.1.3). The ID can consist of a number, or, when using an external PC keyboard, of digits and letters Saving individual measurement datasets You can store individual measurement datasets and assign them an ID that makes it easier to find the dataset again. 1 Switch to the Display mode. 2 Start the manual storing with s. The Store window shows the current dataset. The instrument automatically allocates a memory number to themem no. 166

167 inolab ph/ion/cond 750 Data memory 3 Using [Ident], open the Ident entry window. 4 Input the required name (ID) with With g confirm the ID. In the manual type of storage, the measurement dataset is stored together with the selected ID. 6 Using [ESC], quit the Ident entry window. The Store window shows the dataset with the new ID. 7 Using [ESC], quit the Store window. 167

168 Data memory inolab ph/ion/cond Automatically storing measurement datasets AutoStore enables measurement datasets to be stored at defined time intervals. Starting AutoStore moves you to the Set AutoStore entry window where you define the details of the storage with AutoStore.! ID: The name (ID) identifies the measurement and makes it easier to find the data in memory. The ID can consist of figures and letters (when using an external IBM PC keyboard).! Duration: Here you set up the measuring period for which the planned AutoStore storing is to be performed.! Interval : Here you determine the intervals at which the measuring datasets will be stored.! Memory (data sets): Here you obtain information of how many memory locations are required with the current settings.! Memory available: Here you obtain information of how many memory locations are still available. Note If not enough memory locations are available, a message appears on the display. Change the entries in the Duration and/or Interval field until an available number of memory locations is displayed. 168

169 inolab ph/ion/cond 750 Data memory Measurement datasets can only be stored in a free memory location. If necessary, the contents of the memory must be deleted (see page 176). Starting AutoStore 1 Switch to the Menu mode. 2 Use 46 to select the Mem main menu. 3 Select the Set AutoStore menu item with Confirm the Set AutoStore menu item with g. 5 Select the Open menu item with Confirm the Open menu item with g. The free memory locations are shown (black=free). 7 Use 82 to select a free memory location, Mem Confirm the menu item with g. The Set AutoStore entry window is open. 9 Enter a name with 82, external keyboard or barcode reader. 169

170 Data memory inolab ph/ion/cond Switch to the next entry field with [Next]. Complete the input with Use [Open] to start the automatic storing. 9 appears on the display. Terminating AutoStore AutoStore is automatically finished when the period set for storing (Duration) has expired. You can see that an AutoStore is terminated when 9 is no longer visible on the display. If you want to quit an AutoStore storing procedure before the specified period has expired, proceed as follows: 1 Switch to the Menu mode. 2 Use 46 to select the Mem main menu. 3 Select the Autostore menu item with Confirm the Autostore menu item with g. 5 Select the Close menu item with Confirm the Close menu item with g. The automatic storing function is terminated. Recorded measuring data remain in the memory. The 9 display indicator is no longer displayed. 170

171 inolab ph/ion/cond 750 Data memory Displaying stored measurement datasets You can display measured values that have been stored automatically or manually. Data from the AutoStore memory can be displayed as a graph or in tabular form. Data from the manual measurement dataset memory can only be displayed numerically. Displaying automatically stored measurement datasets graphically 1 Switch to the Menu mode. 2 Use 46 to select the Mem main menu. 3 Select the AutStoGrph menu item with Confirm the AutStoGrph menu item with g. 5 Select the Open menu item with Confirm the Open menu item with g. 7 Select a memory location, e.g. Mem 1, with Confirm the selected memory location with g. The AutoStoGrph Mem 1 entry window is open. 9 Select an available parameter ph or Cond (here, e.g. ph) with Confirm the selected parameter with [Open]. The content of the memory location is displayed in the form of a graph. 171

172 Data memory inolab ph/ion/cond 750 Zooming a sector (zoom function) 1 Display the upper left-hand corner of the required sector with g. 2 Position the corner with Confirm the upper left-hand corner of the required sector and display the lower right-hand corner of the required sector with g. 4 Position the corner with Confirm the selected display sector with g. The display shows the new sector. Note You can zoom up to three times in a sequence and undo each zooming. 172

173 inolab ph/ion/cond 750 Data memory Undoing the zoom function 6 Use g and [Tab] to undo the last zoom function. The sector before the last zooming is displayed again. Terminating the graphical display 1 Switch to the Menu mode. 2 Use 46 to select the Mem main menu. 3 Select the AutStoGrph menu item with Confirm the AutStoGrph menu item with g. 5 Select the Close menu item with Confirm the Close menu item with g. The graphical display is terminated. 173

174 Data memory inolab ph/ion/cond 750 Displaying measuring datasets numerically With the following function you can download manually stored individual datasets or AutoStore data to the display. Filters help you to select individual datasets according to the following criteria:! Number of the memory location (Mem no.)! Identification (ID)! Date and time of storing 1 Use r to call up the manual measurement dataset memory (Mem man). The first dataset that meets the selected criterion is displayed. 2 Call up further measurement dataset memories with r. The measurement dataset memory locations are called up in the order, Mem man - Mem auto Call up the RCL menu with [RCL Menu]. 4 Select the RCL filter menu item with Confirm the RCL filter menu item with g. The RCL filter entry window is open. 174

175 inolab ph/ion/cond 750 Data memory 6 Use 82 to switch on or off a filter, e.g. Mem no. (off,on). 7 Switch to the next entry field with [Next]. Complete all inputs. 8 Option: Select a digit with Increase/reduce values or switch on/off a filter with 82 (off,on). 10 Close the entry window with [ESC]. The first dataset meeting the selected criterion is displayed. 11 Swap between the datasets meeting the selected filter criterion with Terminate the memory display with [ESC]. Note If there are large amounts of data, you may have to wait for a few seconds until a dataset is displayed. 175

176 Data memory inolab ph/ion/cond Deleting stored measurement datasets Deleting automatically stored measurement datasets Using the following function, you can delete the contents of the AutoStore memory locations, Mem 1 to Mem 4. 1 Switch to the Menu mode. 2 Use 46 to select the Mem main menu. 3 Select the Autostore menu item with Confirm the Autostore menu item with g. 5 Select the Clear menu item with Confirm the Clear menu item with g. 7 Select a memory location, e.g. Mem 1, with Confirm the selected memory with g. A security prompt appears on the display. Note You can cancel the delete process with [ESC]. 9 Using [Next], select Yes. 10 Confirm the delete with g. The measurement dataset memory is deleted. 176

177 inolab ph/ion/cond 750 Data memory Deleting the manual measurement dataset memory The memory for individual, manual stored measurement datasets can be deleted as a whole. 1 Switch to the Menu mode. 2 Use 46 to select the Mem main menu. 3 Select the Mem man menu item with Confirm the Mem man menu item with g. 5 Select the Clear menu item with Confirm the Clear menu item with g. A security prompt appears on the display. Note You can cancel the delete process with [ESC]. 7 Using [Next], select Yes. 8 Confirm the delete with g. The manual measurement dataset memory is deleted. 177

178 Data memory inolab ph/ion/cond Memory of system configurations Up to 4 different system configurations can be managed (store, recall, delete and print) by the inolab ph/ion/ Cond 750 meter. This can then be helpful, e.g. if several persons are using the same meter, or different measurement tasks require different settings Saving the system configuration When storing the system configuration, you store all the current settings for all sensors. 1 Switch to the Menu mode with [Menu]. 2 Use 46 to select the Mem main menu. 3 Select the Setting menu item with Confirm the Setting menu item with g. 5 Select the Store menu item with Confirm the Store menu item with g. 7 Use 82 to select a free memory location, Setting Free memory locations are displayed in black, occupied memory locations are gray. 8 Confirm the storing with g. The stored data are displayed. 178

179 inolab ph/ion/cond 750 Data memory 9 View further settings with 82 as necessary. 10 Save the data with [Ok]. 11 Terminate the saving process with [ESC] Recalling a system configuration You can recall system configurations that you have stored yourself or the default setting as follows: 1 Switch to the Menu mode with [Menu]. 2 Use 46 to select the Mem main menu. 3 Select the Settings menu item with Confirm the Settings menu item with g. 5 Select the Open menu item with Confirm the Open menu item with g. 7 Use 82 to select a memory location, Actual, Default or Setting Occupied memory locations are displayed in black, free memory locations are gray. 179

180 Data memory inolab ph/ion/cond Call up the selected memory location with g. The settings are displayed. 9 Call up the selected setting with [Ok]. Actual: Displays the current settings Default: Accepts the default setting Setting 1-4: Opens the stored setting A security prompt appears. 10 Using [Next], select Yes. 11 Confirm the selection with g. The user profile is taken as the current setting. 12 Terminate the Menu mode with m. 180

181 inolab ph/ion/cond 750 Data memory Deleting a system configuration With this function, you can delete system configurations that you have stored yourself. The default settings always remain stored. 1 Switch to the Menu mode with [Menu]. 2 Use 46 to select the Mem main menu. 3 Select the Settings menu item with Confirm the Settings menu item with g. 5 Select the Clear menu item with Confirm the Clear menu item with g. 7 Use 82 to select a memory location, Setting Delete the system configuration with g. A security prompt appears before it is deleted. 9 Using [Next], select Yes. 10 Confirm the delete with g. The user profile is deleted. 181

182 Data memory inolab ph/ion/cond Memory of calibration records The following calibration results are automatically stored in a record during each calibration:! Calibrating for ph/ise! Determination of the cell constant of conductivity measuring cells. The text displayed on the calibration record shows the calibration data for all measured parameters as continuous text. You can recall the data of the last calibration/ determination at any time: 1 Switch to the Menu mode with [Menu]. 2 Use 46 to select the Cal main menu. 3 Select the Cal rec... menu item with Confirm the Cal rec... menu item with g. The Cal. records window opens. The first page of the calibration records is displayed. 5 Scroll through the display text with 2. 6 Scroll through the display text with Terminate the Menu mode with [ESC]. 182

183 inolab ph/ion/cond 750 Data download 10 Data download The inolab ph/ion/cond 750 provides several options of downloading data.! Download to the display (Displaying measured values) numerical display of measured values (standard) graphical display of measured values (digital recorder)! Download to the integrated printer (on inolab ph/ion/cond 750 with integrated printer only) printing graphical and numerical data printing on the digital recorder! Download to the RS 232/REC interface printing numerical data on an external printer transmitting data to a PC, e.g. to be saved in a database recording the data via an external analog recorder You can download the following data:! Graphical displays! Alphanumerical displays Calibration records Stored measured values Stored system configurations Alphanumerical data can be downloaded as a legible text or database-conform (data list separated by semicolons). 183

184 Data download inolab ph/ion/cond 750 You can start the data download to the integrated printer or the RS232 interface as follows:! Manually by pressing the p softkey: prints, e.g. the current measured value or the current calibration record by pressing the g key: prints the current measured value (precondition: the AutoRead function is not active) by selecting Print in the menu: prints, e.g. the system configuration or selected elements of a data memory! Automatically by selecting Print in the menu: prints, e.g. the recording on the digital recorder after each AutoRead measurement with a stable measured value each time a measured value is stored if AutoStore is active (9 flashes) after each calibration when the calibration record is downloaded 184

185 inolab ph/ion/cond 750 Data download 10.1 Data download to the display The current measured value can be displayed numerically or graphically. The numerical display of measured values is the default setting. The graphical representation of a selected measured parameter is activated via the digital recorder Numerical display The numerical display of measured values is the default display. The current measured value is displayed continuously. The numerical display looks as follows (example): 185

186 Data download inolab ph/ion/cond Graphical display The digital recorder continuously records measured values and depicts them graphically with respect to time (vertical axis) on the display. In the graphical display the cursor (+) moves from the top to the bottom. The measured value is also displayed numerically (here, e.g ph) at the same time. If the digital recorder is started, you are moved first to the Set Recorder entry window to define the details of the graphical display. Entry window Graphical display ! Center (1) determines the center of the measured value range (here 7.000).! Delta (2) determines the extension of the measured value range from the center (here, Center ± Delta results in the range ph to ).! Timebase: min (3) defines the length of the time intervals (5, 6) shown on the display; the duration is also displayed on the recorder strip (8)! Digits (4) determines the number of decimal places When the first period has expired, the recording of the current period is displayed in the lower half (6) and the previous period is displayed in the upper half (5). Note The current measured values are not stored. 186

187 inolab ph/ion/cond 750 Data download Starting the digital recorder When starting the digital recorder, you can make settings that define the graphical display and the recording of the measured values. 1 Switch to the Menu mode. 2 Use 46 to select the Opt main menu. 3 Select the Dig. Rec menu item with Confirm the Dig. Rec menu item with g. 5 Select the Open menu item with Confirm the Open menu item with g. 7 Use 82 to select one of the menu items, ph or Cond. 8 Confirm the selected menu item with g. The Set Recorder entry field appears on the display. 9 Option: Move between the individual digits with Increase or decrease the value with Switch to the next entry field with [Next]. 12 Complete all inputs. 13 Confirm the input and start the digital recorder with [Open]. or quit without starting the recorder with [ESC]. 187

188 Data download inolab ph/ion/cond Option: Switch to the numerical display with [Tab]. Reducing the measuring range limits (zoom function) 15 Display the left-hand measuring range limit with g. 16 Change the left-hand measuring range limit with Fix the left-hand measuring range limit and display the right-hand measuring range limit with g. 18 Change the right-hand measuring range limit with Fix the right-hand measuring range limit with g. The measuring range limits show the new values. 188

189 inolab ph/ion/cond 750 Data download Undoing the zoom function Terminating the digital recorder 20 Use g and [Tab] to undo the zoom function. The sector determined in the Set Recorder entry window appears on the display again. 1 Switch to the Menu mode. 2 Use 46 to select the Opt main menu. 3 Select the Dig. Rec menu item with Confirm the Dig. Rec menu item with g. 5 Select the Close menu item with Confirm the Close menu item with g. The digital recording is terminated. 189

190 Data download inolab ph/ion/cond Downloading data to the integrated printer General information The integrated printer is operated via the o key (switched on/off) and the f key (manual line feed). The operating status of the printer is indicated by the print LED.! Green LED: printer ready for operation! Red LED: printer off or malfunction To print on the integrated printer, the following conditions must be fulfilled:! The integrated printer must be switched on and ready for operation (print LED lights up green, see section ),! The data download is set to the integrated printer (see section ),! A manual or automatic print job must have been given (section ), Note For troublefree operation of the integrated printer, we recommend to disconnect any other devices from the RS232/REC interface. It is not possible to operate the integrated printer and external devices (printer, PC, or analog recorder) on the RS232/REC interface at the same time. 190

191 inolab ph/ion/cond 750 Data download Switching on the integrated printer It is only possible to print with the integrated printer if the printer has been switched on. 1 Switch on the printer with o. The print LED lights up green. The printer is ready for operation. Note Line feed with f is only possible when the integrated printer has been switched off (the print LED lights up red) Downloading data to the integrated printer Data is either downloaded to the integrated printer or to the RS232 interface. You can select where to download the data in the Opt menu. 1 Switch to the Menu mode. 2 Use 46 to select the Opt main menu. 3 Select the Int. Prt menu item with Confirm the Int. Prt menu item with g. The data download is switched to the integrated printer ( ). 5 Terminate the Menu mode with m. 191

192 Data download inolab ph/ion/cond Printing Printing the display When the p softkey function is shown on the display you can always print the current display. Use the p softkey to print the following data:! The dataset of the current measured value! The dataset of a stored measured value! The graphical representation of a measured data series stored with AutoStore (only on the integrated printer)! Calibration records 1 Start the printout of the currently displayed numerical or graphical data with p. Printing stored datasets If there are stored measured values, you can display and print them. 1 Switch to the Display mode. 2 Switch to the memory display with r. 3 Call up the RCL menu with [RCL Menu]. 4 Option: Fix the selection criteria for the data in the RCL filter entry window (see section 9.1.3) 5 Select the Print all menu item with Confirm the Print all menu item with g. All datasets meeting the selection criteria in the RCL filter entry window are printed. 192

193 inolab ph/ion/cond 750 Data download Printing the display of the digital recorder If the digital recorder is switched on, the graphical representation of the measured values is also downloaded to the integrated printer at the same time. Precondition: The printer is on (green LED) and the download is switched to the integrated printer (see section ). 1 Switch to the Menu mode. 2 Use 46 to select the Opt main menu. 3 Select the Dig. Rec menu item with Confirm the Dig. Rec menu item with g. 5 Select the Print menu item with Confirm the Print menu item with g. Print is active ( ). The recorder strip is printed out as long as the Print menu item is active ( ). 193

194 Data download inolab ph/ion/cond 750 Switching off the printout of the digital recorder The printout of the digital recorder can be switched off without terminating the digital recorder. 1 Switch to the Menu mode. 2 Use 46 to select the Opt main menu. 3 Select the Dig. Rec menu item with Confirm the Dig. Rec menu item with g. 5 Select the Print menu item with Confirm the Print menu item with g. Print is switched off. The recorder printout is discontinued, but the screen display of the recorder continues to run. 194

195 inolab ph/ion/cond 750 Data download Selecting the print quality You can select the quality of the printout in the menu:! Draft: Basic print quality (prints more quickly)! LQ: Higher print quality (prints more slowly) 1 Switch to the Menu mode. 2 Use 46 to select the Opt main menu. 3 Select the RS232/Prt menu item with Confirm the RS232/Prt menu item with g. 5 Select the Prt font menu item with Confirm the Prt font menu item with g. 7 Select the LQ or Draft menu item with Confirm the selected menu item with g. The printing quality has been set. 195

196 Data download inolab ph/ion/cond Downloading data to an external printer/pc Via the RS 232 interface, you can transmit the data to a PC or an external printer. Connect the interface to the devices via the AK T-PC (PC) or AK T-9PIN/25PIN (ext. printer) cable. The data download automatically switches to the RS232 interface. Note If a grounded PC/printer is connected, you can also measure in grounded media. Set up the following transmission data on the PC/printer: Baud rate can be selected from: 1200, 2400, 4800, 9600 Handshake Parity Data bits 8 Stop bits 1 RTS/CTS + Xon/Xoff none Socket assignment RS 232 REC 1 RTS 2 RxD 3 TxD 4DTR 5 SGnd 6 CTS 196

197 inolab ph/ion/cond 750 Data download Switch the data download to the RS232/REC interface To download data to an external printer/pc, the data download must be switched to the RS232/REC interface. 1 Switch to the Menu mode. 2 Use 46 to select the Opt main menu. 3 Select the RS232/Rec menu item with Confirm the RS232/Rec menu item with g. The data is downloaded to the RS232/REC interface ( ). 5 Terminate the Menu mode with m Setting the baud rate The baud rate for the RS232/REC interface must be the same as the baud rate of the connected devices. 1 Switch to the Menu mode. 2 Use 46 to select the Opt main menu. 3 Select the RS232/Prt menu item with Confirm the RS232/Prt menu item with g. 5 Select the Baud rate menu item with Confirm the Baud rate menu item with g. 197

198 Data download inolab ph/ion/cond Use 82 to select the required baud rate 1200, 2400, 4800 or Confirm the selected baud rate with g. The selected baud rate is active ( ). 9 Terminate the Menu mode with m Determining the data format You can determine the form in which the numerical data is sent to the RS232/REC interface. The selection of the data format type determines the data transmission:! Ascii the data is transmitted in the same form as it is displayed: recommended for external printers on the RS232/REC interface! Data The data is transmitted with separators. The data can easily be saved in a database if it is transmitted to a PC. 1 Switch to the Menu mode. 2 Use 46 to select the Opt main menu. 3 Select the RS232/Prt menu item with Confirm the RS232/Prt menu item with g. 198

199 inolab ph/ion/cond 750 Data download 5 Select the Datformat menu item with Confirm the Datformat menu item with g. 7 Using 82, select the Ascii or Data menu item. 8 Confirm the selected menu item with g. The selected data format is active ( ). 9 Terminate the Menu mode with m. Data format In the Data format, all data is downloaded in a fixed sequence and separated by semicolons (;). If you download more than one data memory location in the RCL menu, a header designating the individual data columns is automatically downloaded. Data download in the Data format with the header: Header Datasets Printing the header You can also print the header separately. 1 Switch to the Menu mode. 2 Use 46 to select the Opt main menu. 3 Select the RS232/Prt menu item with Confirm the RS232/Prt menu item with g. 199

200 Data download inolab ph/ion/cond Select the Datformat menu item with Confirm the Datformat menu item with g. 7 Select the Header menu item with Confirm the Header menu item with g. The labeling of the data in the Data format is downloaded (e.g. on a printer or the PC). 9 Terminate the Menu mode with m Setting the print interval The print interval sets the time period between the transmission of measured values to the interface. 1 Switch to the Menu mode. 2 Use 46 to select the Opt main menu. 3 Select the RS232/Prt menu item with Confirm the RS232/Prt menu item with g. 5 Select the Prt int.menu item with Confirm the Prt int... menu item with g. The Print interval window appears on the display. 200

201 inolab ph/ion/cond 750 Data download 7 Switch the internal printer on or off (on / off) with Using [Next], switch to the fields for the print interval (Interval ) and the time unit for the print interval (Unit ). Complete the entries. 9 Increase or decrease the value with Using [Next], switch to the fields for the print interval (Interval ) and the time unit for the print interval (Unit ). Complete the entries. 11 Select the required inputs with Confirm the settings with g. 13 Finish the input with [ESC] Downloading data to an external printer or PC Connecting the external printer/pc Printing/ transmitting data to the PC In order to transmit data to an external printer or PC, follow the settings in the RS232/Prt menu. The inolab ph/ion/cond 750 allows an external printer to be run on the RS232/REC interface. Connect the external printer to the RS232/REC interface. Printing or transmitting data to a PC is the same as for the integrated printer (see chapter 10 DATA DOWNLOAD). 201

202 Data download inolab ph/ion/cond 750 Note In order to store the data in a file on the PC, a terminal program is required that can continuously store the received data Downloading data to the external recorder To record measured values graphically, you can also connect an analog external recorder to the RS232/REC interface. Note Before recording measured values with the external recorder, please observe the following points:! Switch off AutoRange (automatic measuring range switch-over),! Set the measuring range manually (tables with the possible measuring ranges can be found in chapter 13 TECHNICAL DATA, section 13.1 METER),! Switch the data download to the RS232/REC interface,! Select the measured parameter to be recorded in the menu. Selecting the measured parameter to be recorded As soon as the data download is directed to the RS232/REC interface and the measured parameter to be recorded is selected, the corresponding voltage is downloaded on the RS232/REC interface. 1 Switch to the Menu mode. 2 Use 46 to select the Opt main menu. 3 Select the Ana. Rec menu item with Confirm the Ana. Rec menu item with g. 5 Select the measured parameter to be recorded with

203 inolab ph/ion/cond 750 Data download 6 Confirm the selected measured parameter with g. The selected measured parameter is active ( ). 7 Terminate the Menu mode with m. The voltage corresponding to the selected measured parameter is downloaded to the interface. 8 Switch on the recorder. Note Additional settings can be made on the recorder itself. 203