SP-2300/SP-2500 Microprocessor ph/orp/ion Benchtop Meter. Operation Manual

Transcription

1 SP-2300/SP-2500 Microprocessor ph/orp/ion Benchtop Meter Operation Manual 1

2 CONTENTS 1. Specifications Panel Description Front panel Sockets Display Keypad Operation Measurement Block diagram of parameter settings Parameter settings Auto/Manual data storage Data transmitting and display Delet all of data Calibration ph calibration Opearation of ph calibration Auto calibration for preset buffers (CT/CN) Any Buffer manual calibration (CA) Define Buffers calibration (CD) ORP relative potential adjustment ION concentration calibration (SP-2500 only) ION concentration calibration (CC) (SP-2500 only) Error message Maintenance Battery replacement Electrode clean and maintenance Modbus protocol and instructions Function code Modbus name and address table Appenix...41 Note: The instrument software and hardware maybe modified to make progress of the better operation and better accuracy. Thus, this may result in difference between this manual and your instrument. We can not guarantee there are no errors in the manual. Therefore, we are sure that you understand that we cannot accept any legal claims resulting from the data, figures or descriptions.

3 1. Specifications Model SP-2300 SP-2500 Measuring Unit ph/orp/temp ph/orp/temp/ion ph -2.00~16.00 ph/-2.000~ ph Measuring ORP -1999~1999 mv/ ~ mv Range TEMP -10.0~110.0 C ION 0.001~ ppm(mg/l) ph 0.01 ph/0.001 ph Resolution ORP 1 mv/0.1 mv TEMP 0.1 C ION 1, 0.1, 0.01, ppm(mg/l) ph ±0.01 ph/±0.005 ph(±1digit) Accuracy ORP ±0.05 %(±1Digit) TEMP ±0.2 C(±1Digit) ION ±0.5 %(±1Digit) Auto-Read(HOLD) Yes Temperature Automatic with PT1000/NTC30K, auto recognition Compensation Manual ph: Tech./ NIST/ ANY/ Define Buffer mode Calibration ION: Ion concentration calibration (SP-2500 only) Up to 5-points calibration Rel. ORP Relative potential adjustable range: ±300 mv GLP Calibration Timer/Counter Timer or Counter selectable, range: 0~9999 times or hours RS232 Interface Data Storage Auto Power-off Ambient Temperature Storage Temperature Impedance Input Display Power Consumption Power Supply Certification Dimension Weight One way transmission: To the computer/ printer (ASCII) Two way transmission: Modbus (RTU or ASCII) 500 data sets with time and date stamp Continuously auto data storage & logging /Manual Yes, On/Off(Programmable time duration for auto power-off) 0~50C -20~70C LCD Display with backlight Max. 1W 4 x AA Batteries or AC/DC 6V adaptor CE 220x190x70mm(LxWxH) 0.7Kg Note: The specifications and appearance of the instrument are subject to change without notice. 1

4 2. Panel Description 2.1 Front Panel 2.2 Sockets ph/ise REF. T/P POWER RS-232 :BNC socket for ph, ORP, or specific ION electrode :Reference electrode socket :Temperature probe socket :6V DC Adaptor socket :RS-232 interface for computer/printer connection (For optional accessory: RS-232 cable Order No. 8-32) 2

5 2.3 Display Setting Mode Measuring Mode Reading Mode Unit Display Auto Read Auto Temp. Compensation Calibration Mode Time/Date Data Storage Mode Baud Rate Low Battery Warning Data Storage Location No. Data Output/ Transmitting Mode Data Storage ID No. 3

6 2.4 Keypad POWER MODE Power ON/OFF. Press POWER key to turn on the instrument, press it again to turn it off. Press POWER for a while when the power is already on, then the display will show the model type and software version. The user may set up auto turn-off timer. Users may select to switch on the auto power-off function (with programmable timer),or to switch off the function. Switch to ph, ORP or ISE(SP-2500 only) mode. Press Mode key to back to measuring mode at any time except under calibration mode. CAL Enter calibration mode / Select buffer type AUTO READ Activate/deactivate Auto Read control. Hold the measurement value, press it for activate the function, and press again to cancel it. UP Increase values / Scroll upwards or leftwards. DOWN Decrease values / Scroll downwards or rightwards. ENTER Confirm inputs / Execute / Transmitting data manually via RS-232 in measuring mode. RECALL Activate manual data recall and mode selection / Deactivate auto data recall. STORE Activate manual data storage / Deactivate auto data storage Note: The icon of the manual is subject to change without notice. 4

7 3. Operation 3.1 Measurement Press POWER key to turn on the instrument and it will directly enter the last measurement mode to start measurement. Press POWER key for a while when the power is already on, then the display will show the model type and software version. The user may set up auto turn-off timer. Users may select to switch on the auto power-off function (with programmable timer),or to switch off the function Mode Press MODE key to switch to ph, ORP, ION(for SP-2500 only) measuring mode. (ION mode has 2 units: ppm and mg/l for selection.) Press ENTER key +MODE key to switch on the decimal of resolution Temperature compensation 1. ATCAutomatically recognition of temperature probe NTC30K or PT-1K and auto temperature measurement and compensation. Under setting mode, the temperature can be adjusted ±5C for temperature correction. 2. MTCEntering into manual temperature compensation mode when there is no ATC probe plugged in. Press upward or downward key to modify the temperature value. Press upward and downward key simultaneously to restore default value 25C Auto Read Drift Control Under measurement mode, press AUTO READ key to hold the present reading(hold), and press ENTER key to confirm the Auto-Read function and to activate new measurement. Wait until the measurement is stable, the instrument hold the value automatically(hold) to finish the procedure. To cancel the hold value, press AUTO READ key or MODE key to relieve the Auto-Read hold value. Activate Auto-Read Press AUTO READ key Put the electrode into sample solution, press ENTER for starting reading. The Auto Read symbol twinkles. Wait until the measurement is stable. If the measurement can not be stable in a certain time, the display shows E-03 error message, and the Auto Read symbol disappears. Press ENTER key again to re-start the Auto-Read Wait until the measurement becomes stable, the Auto Read symbol stop twinkling. The display shows the ph measurement and holds the value.(hold) Relieve Auto-Read Hold Press AUTO READ key or MODE key 5

8 3.2 Block diagram of parameter settings Enter Parameter Setting mode Data Clear (Rewritable) Computer/ Modbus Comunica-tion Glp Calibration cycle setting System Time setting SEC (Digital Filter) Auto_Power Auto Power off setting ATC Temp. Compensation Buffer Define Buffer table OFF Preset: Auto AUTO (On) RTU o ASCII Parity Baud rate Glp.T Counter Setting Glp.H Timer Setting Year setting Date Setting Time setting Set measurement average Times OFF (Off) Preset: Auto AUTO (On) Timer Setting Temp. Setting Buffer_1~5 Setting Press RECALL Key Upward and Downward key Enter key Note: Under any setup mode, press MODE to back to measurement mode at any time. (Except Buffer_1~5 Settings) 6

9 3.3 Parameter settings Entering setting of parameter While the instrument s power is off, press MODE key and hold the pressing continuously, and press POWER key until the display shows model of the instrument. Release the POWER key and wait until the menu display enter into parameter settings mode, and then release MODE key. Press upward or downward key to select setting menu. To exit the parameter settings mode, press MODE key to back to measurement mode. Factory default value: Data Storage Rewriteable Function: AUTO Communication Settings: ASCII, non, 4800 GLP Calibration Settings: Counter, 5 System Time Settings: 2011, 01:01, 00:04 Digital Filter: 5 Auto Power-Off: OFF Define Calibration Buffer Table: Please refer to Ch.8, Table Data storage rewritable function Under data storage rewritable function menu display, users can set whether to enable the function. AUTO means to turn on the function. When data storage is full the data logger will overwrite the new data on the previous one. It is also allowed to select OFF to turn off the function. Press ENTER key to enter. Press upward or downward to select auto data storage rewritable function or to turn off the function. Press ENTER key for confirmation Enter Communication settings 7

10 3.3.3 RS-232 communication settings Users may according to their communication needs with following table to set transfer mode, (ASCII, RTU), parity (non, odd, even) and transmission baud rate (1200, 2400, 4800, 9600). 1. Communication setting format RS232 Single way Dual way Data transfer to Interface computer or printer Modbus Protocol Mode ASCII ASCII RTU Transmission 1200, 2400, 2400, 4800, 9600 Baud Rate 4800, 9600 Default data bit Parity non non, odd, even non odd, even Default stop bit The default None address 1 Note:1.Because of different transmission formats, two kinds of communication mode can not be operated simultaneously. 2. This Modbus protocol does not include the selection of baud rate Data bits, stop bits and the instrument s address are preset value which can not be modified. 8

11 2. Communication setting procedure Press ENTER key to enter Press upward or downward key to select ASCII or RTU transmission mode. Press ENTER key for confirmation Press upward or downward key to select odd, even or none parity, press ENTER key for confirmation. Enter Calibration Cycle settings Press upward or downward key to select baud rate, press ENTER key for confirmation. 9

12 3.3.4 Calibration cycle settings(glp calibration interval) Users can set their own calibration cycle counter or timer. 1. Calibration Counter: Under ph measurement mode, press AUTO READ key to activate the auto drift control measurement function. Each press of ENTER key represent that one time of measurement work has been done. After reaching the setup times for counter, the instrument makes reminder. 2. Calibration Timer: After how many hours from last calibration, the instrument makes reminder. If it exceeds the set times or hours, under ph measurement mode the symbol in the display continuously twinkles. The twinkling symbol will disappear until the next execution of ph calibration Press ENTER key to enter. Press upward or downward key to select calibration counter(t), or timer(h) Press ENTER key for confirmation. Press ENTER key for confirmation. Press ENTER key for confirmation. When the value twinkles, press upward or downward key to set calibration counter from 0~9999 times. If the value is set 0, it represents the GLP calibration counter has been turned off. When the value twinkles, press upward or downward key to set calibration time from 0~9999 hours. If the value is set 0, it represents the GLP calibration timer has been turned off. Enter System Time settings 10

13 3.3.5 System time settings Users may set the year, month, date, hour, and minute. When replacing the batteries, it is necessary to enter to the setting to update the system time. Press ENTER key to enter When the value twinkles, press upward or downward key to modify hour. Press ENTER key to confirm it. When the value twinkles, press upward or downward key to modify year. Press ENTER key to confirm it. When the value twinkles, press upward or downward key to modify minute. Press ENTER key to confirm it. When the value twinkles, press upward or downward key to modify month. Press ENTER key to confirm it. Enter Digital Filter settings When the value twinkles, press upward or downward key to modify date. Press ENTER key to confirm it. 11

14 3.3.6 Digital Filter settings (Sample average of measurements) Enter the setup of Digital filter. You may select the number of sample to be averaged each time to become a reading which is gradually counted in order to increase the stability of measurement. Press ENTER key to enter Enter Auto Power-OFF settings When the value twinkles, press upward or downward key to modify times of digital filter. Press ENTER key for confirmation. 12

15 3.3.7 Auto power-off settings Enter the setup of auto power-off. Users may setup whether to activate the auto power-off function, and there is a programmable timer for setting. The auto power-off timer setting range is from 10 minutes minimum to 23 hours and 59 minutes maximum. Note: Preset---OFF Press ENTER key to enter Press upward or downward key to select auto power-off, or to turn off this function. Press ENTER key for confirmation. When the value twinkles, press upward or downward key to modify the auto power-off timer. Press ENTER key for confirmation. Enter Auto Temperature Compensation Correction settings 13

16 3.3.8 Auto temperature compensation correction settings Enter auto temperature compensation settings. If the ATC probe is connected, it is allowed to correct the temperature value by pressing upward or downward key of 5C. Or press upward and downward key simultaneously to zero the temperature modification value. Note: If not ATC mode, it can not enter into auto temperature compensation correction settings. Press ENTER key to enter When the value twinkles, press upward or downward key to modify the temperature value difference. The corrected temperature will show in next menu display. Press ENTER key for confirmation. Enter Define Calibration Table settings 14

17 3.3.9Defien cal. table setting (Self-definition ph/temp. table--cd mode ) Define mode has pre-set 5 buffer solution ph/temperature(range: 5~50C) table. Users may modify the data sheet according to the buffer solutions set which they use. The table can be modified and saved in the memory of the transmitter. Press ENTER key to enter Press RECALL key to go back to Data storage rewritable function settings, press MODE key to back to measurement mode. Press upward or downward key to select buffer set 1~5, Press ENTER key to enter. When the buffer value twinkles, press upward or downward key to modify the buffer value. Press ENTER key to confirm it and to proceed to next temperature with the same buffer set. While setting, users may press MODE at any time to back to buffer selection menu. Each buffer value of each setting can be set from 5C to 50C. Every 5C a setting. Press ENTER key to input it after sequence. Press ENTER key to back to buffer set selection menu display. Users may select another buffer set and proceed the setting. 15

18 3.4 Auto/Manual Data Storage Under data storage mode, users may store ph, ORP and ION(SP-2500 only) measurement with No. and ID two kinds of classification. The No. represents the order of storage sequence. When data is stored to the 500 th data, the display will shows Full to represent there is no more space for data logger memory. While ID number 1~500 is for grouping the samples which the user requires. The Auto data storage can be set according to the time interval setting, the minimum interval is 5 seconds. If turn on the Data Rewritable Function, when the data memory is full the data logger will overwrite the new data Auto data storage Under measurement mode, press and hold ENTER key and press STORE key simultaneously to enter auto storage settings. When auto storage is not activated, press MODE key to exit the menu. Display the starting storage number Press ENTER key to enter Press upward or downward key to modify the grouping ID. Press ENTER key to confirm it. When the value twinkles, press upward or downward key to set the minute interval of auto storage. Press ENTER key to confirm it. When the value twinkles, press upward or downward key to set the second interval of auto storage. Press ENTER key to confirm it. Auto Storetwinkling represents the auto storage is activating. Press ENTER + STORE to turn off the auto storage function, and back to the measurement mode. 16

19 3.4.2 Manual data storage Overflow of data storage Under measurement mode, press STORE key to enter manual data storage mode. Press MODE key to exit at any time. Display the starting storage number When the all the memory is occupied and the data can not be stored any more, the display twinkles the text for reminder for 5 seconds and back to the measurement mode. Press ENTER key to enter Users may delete all of the data according to the ch 3.6 instruction.(when auto rewritable function is turned on, there is no this data full display reminder.) Press upward or downward key to modify the grouping ID. Press ENTER key to confirm it. Back to measurement mode 17

20 3.5 Data transmitting and display Under measurement mode, press ENTER key to manually transmit the real-time measurement value by RS-232 interface. Note: The output of the instrument is non-insulated signal. It may impact the transmitting measurement value if the instrument connects with other earth-related device Time interval auto transmitting Data display & manual transmitting (Transmit the real-time measurement to a Under measurement mode, press computer or a printer through RS-232) RECALL key to roll up the data Under measurement mode, press and hold display & manual transmitting menu. ENTER key and then press RECALL key There are four kinds of operation mode. to enter auto transmitting menu display. Press ENTER key to enter the menu. After finishing setting, the data is 1.Display the stored data transmitted through RS-232 interface. When the value twinkles, press upward or downward key to set the minute interval of auto transmitting. Press ENTER key to confirm it. Press ENTER key to enter recent stored data menu display. When the value twinkles, press upward or downward key to set the second interval of auto transmitting. Press ENTER key to confirm it. When Auto RCL twinkles, it represents the auto transmitting function has been activated. Press ENTER+ RECALL to turn off the auto transmitting mode and back to the measurement mode. Press upward or downward key to select storage position. Press ENTER key to confirm it. Display the data and its ID grouping. Press upward and downward key to directly look up other data and their ID grouping. Press ENTER key to confirm to display this data of measurement value, storage year, date, and time. Back to measurement mode 18

21 2. Display the last calibration data (1) Under ph measurement mode, press RECALL key to show the last ph calibration data in display. (ex: 3-Point calibration) Press ENTER key to enter. The display shows Buffer 1 calibration data. Press ENTER key to enter. The display shows Buffer 3 calibration data. If no data, ignores the procedure and display the Slope value. Press ENTER key to display the mv value of Buffer 1. Press ENTER key to display the mv value of Buffer 3. Press ENTER key to enter. The display shows Buffer 2 calibration data. Press ENTER key to display the Slope value. If no data, ignores the procedure and display the Slope value. Press ENTER key to display the mv value of Buffer 2. Press ENTER key to display the SENSITIVITY value. 19

22 Press ENTER key to display the Press ENTER key ASYMMETRY value. Back to measurement mode (2) Under ORP measurement mode, press RECALL key to show the last relative potential adjusted data Press ENTER in display. key to display the R2 value. Press ENTER key to display Press ENTER relative potential. key to display the cal. data storage year. Press ENTER key to display the Press ENTER key cal. data storage date. Back to measurement mode Press ENTER key to display the cal. data storage time. 20

23 (2) Under ION measurement mode, press RECALL key to show the last ISE concentration calibration data in display. (ex: 3-Point calibration)(sp-2500 only) Press ENTER key to enter. The display shows Buffer 1 calibration data. Press ENTER key to enter. The display shows Buffer 3 calibration data. If no data, ignores the procedure and display the Slope value. Press ENTER key to display the mv value of Buffer 1. Press ENTER key to display the mv value of Buffer 3. Press ENTER key to enter. The display shows Buffer 2 calibration data. Press ENTER key to display the Slope value. Press ENTER key to display the mv value of Buffer 2. Press ENTER key to display the SENSITIVITY value. 21

24 3. Manual stored data transmitting (1) Transmit all the stored data Press ENTER key to display the Press ENTER key R2 value. Transmission completed Back to measurement mode Note: The output of the instrument is non-insulated signal. It may impact Press ENTER the transmitting measurement value key to display the if the instrument connects with other cal. data storage year. earth-related device. (2) Format of received storage data Press ENTER key to display the cal. data storage date. Press ENTER key to display the cal. data storage time. Press ENTER key Back to measurement mode 22

25 4. Calibration data transmitting 3.6 Delete all of the data (1) Transmit the stored cal. data Under power off status, press & hold STORE key and then Through RS-232 interface press & hold POWER key until the display shows the model of instrument. Release POWER key. While the menu display shows data clean text, release STORE key. Press ENTER key Transmission completed Back to measurement mode (2) Format of received calibration data SP-2300 ph mode Press ENTER key to confirm to delete all the data. To abandon the deletion, please press MODE key. Back to measurement mode SP-2500 ph mode SP-2500 ION mode 23

26 4. Calibration Under measurement mode, press CAL key to enter calibration mode, and press MODE key to go back to measurement mode. 4.1 ph Calibration The instrument provides multi-point standard buffer solution calibration. You may decide how many points to calibrate the measurement system.(up to 5-point) The principle is according to Method of Least Squares. Apply linear regression to calibration the electrode s slope and zero point (Asy, Offset or Zero point). When calibrating a electrode, you may calibrate 1 to 5 point by any sequence to provide linear regression for mv and ph multi-calibration of a electrode, and to show the electrode s slope and zero point(asy, offset or Zero point) at 25C. The electrode s slope rate which is actual slope divided by theoretical slope and the sensitivity shows in percentage in the display. In addition, the display shows the linear regression determination coefficient, R2, of the electrode and buffer solution to provide you an estimation of an electrode s regression suitability. According to different combination of standard buffers, the TECH, NIST, Any buffer solution calibration modes are provided TECH mode (up to 3 points calibration), CT The electrode is automatically calibrated according to built-in ph4.01, ph7.00, ph10.00 Tech standard buffers. The range of zero point and slope of the electrode is also determined. If one of them is over the range, the display shows error message of zero point and slope failure. (See appendix Table 1, ph/temperature table of TECH standard buffers) NIST mode (up to 5 points calibration), CN The electrode is automatically calibrated according to ph value and temperature of NIST standard buffers.(built-in 1.68, 4.01, 6.86, 9.18, NIST standard buffer calibration set) The range of zero point and slope of the electrode is also determined. If one of them is over the range, the display shows error message of zero point and slope failure. (See appendix Table 2, ph/temperature table of NIST standard buffers) Any buffer mode (up to 5 points calibration), CA The electrode measures mv value of different standard solutions. According 24

27 to theoretic slope and the temperature of standard solutions, the display shows a approximate ph value. Then, you can calibrate the electrode by freely adjust the ph value as those of the standard solutions. There is not a zero point range failure determination by the instrument but only the slope range determination. If the slope is over the range, the display shows error message of slope failure Define Buffers mode(up to 5 points calibration), CD There is a factory default 5 buffer standard solutions ph/temperature table which may be modified and saved by users. When users have their own buffer solutions, they may create or modify the data sheet and then save it in the memory of transmitter. Under this calibration mode, the sensor does not do the zero-point calibration and slope range determination. (See appendix Table 3, ph/temperature table of define(built-in) standard buffers.) Definition of calibration parameter You can calibrate the electrode by one point or up to three points of standard solutions by any sequence. As different calibration point method is applied, the definition of the zero point and slope different. Calibration point Determination The showed calibration value One point calibration Two or three point calibration Asy Asy Slope Zero point (Asy, offset or Zero point)= Asy 1.If not calibrated, Slope = Theoretical slope 2.If calibrated, Slope = Slope of last calibration Zero point (Asy, offset or Zero point)= Asy Slope = Slope * Note: To obtain a new zero point(asy) and Slope by applying linear regression. 25

28 4.2 operation of ph calibration Under ph measurement mode, press CAL key to enter ph calibration mode. Press MODE at any time to finish calibration and back to measurement mode After entering calibration mode, press CAL key to switch buffer type. Press ENTER for confirmation. Buffer TypeCT1: TECH. Buffer No.1 CN1: NIST. Buffer No.1 CA1: Any Buffer No.1 CD1: Define Buffer No Within the 4 kinds of buffer type, they all can be done with up to 5 points calibration except TECH. Buffer for only single to three points calibration. You may calibrate the electrode with certain type buffers at any order. 4.3 Auto calibration for preset Buffers (CT / CN) After entering to calibration mode, press CAL key to select Ct1 or Cn1. If temperature mode is set as MTC(Manual), the temperature value starts twinkling. Press upward or downward key to adjust the temperature value. Or press upward and downward key simultaneously to back to the preset value--25c. Press ENTER key to start to read the preset Buffer 1 value When reading the value, the Auto Read symbol in the display starts to twinkle. Wait until the value is stable or directly press ENTER key to read the present value, then the menu enter into preset buffer 1 value with temperature value. 26

29 4.3.3 After entering preset Buffer 1 menu display, press ENTER or wait for 3 seconds to enter the Buffer 2 calibration menu display After entering into Buffer 2 menu display, press MODE key to leave the calibration menu to finish it as a single point calibration. The menu display shows slope value; for multi points calibration, clean the ph electrode with distilled water, put the electrode into second buffer solution. If temperature mode is set as MTC (Manual), the temperature value starts twinkling. Press upward or downward key to adjust the temperature value. Or press upward and downward key simultaneously to back to the preset value--25c. Press ENTER key to start to read the preset Buffer 2 value When reading the value, the Auto Read symbol in the display starts to twinkle. Wait until the value is stable or directly press ENTER key to read the present value, then the menu enter into preset buffer 2 value with temperature value After entering preset Buffer 2 menu display, press ENTER or wait for 3 seconds to enter the Buffer 3 calibration menu display. 27

30 4.3.7 After entering into Buffer 2 menu display, press MODE key to leave the calibration menu to finish it as a dual point calibration. The menu display shows slope value; for multi points calibration, clean the ph electrode with distilled water, put the electrode into third buffer solution. Press ENTER key to start to read the preset Buffer 3 value for continuing calibration After finishing whether single, dual to five points calibration(ct mode up to three points), press ENTER or wait for 3 seconds to show the slope value, the SENSITIVITY value, the ASYMMETRY value, the R2 value. Then after 3 seconds or press ENTER key to go back to measurement mode. 28

31 4.4 Any Buffer manual calibration (CA) After entering calibration mode, clean the ph electrode with distilled water, put the electrode into first buffer solution. Press CAL key to select CA1. If temperature mode is set as MTC (Manual), the temperature value starts twinkling. Press upward or downward key to adjust the temperature value. Or press upward and downward key simultaneously to back to the preset value--25c. Press ENTER key to start to read the preset Buffer 1 value When reading the value, the Auto Read symbol in the display starts to twinkle. Wait until the value is stable or directly press ENTER key to read the present value, then the menu enter into manual calibration for Buffer After entering into manual calibration of Buffer 1 menu display (ph value twinkles), press upward or downward key to adjust the value to the selected buffer 1 value. After confirming, press ENTER key to enter into CA2 calibration menu display Under CA2 calibration menu display, if press MODE key to leave the calibration menu to finish it as a single point calibration. The menu display shows slope value; for multi points calibration, clean the ph electrode with distilled water, put the electrode into second buffer solution. If temperature mode is set as MTC (Manual), the temperature value starts twinkling. Press upward or downward key to adjust the temperature value. Or press upward and downward key simultaneously to back to the preset value--25c. Press ENTER key to start to read the Buffer 2 value. 29

32 4.4.5 When reading the value, the Auto Read symbol in the display starts to twinkle. Wait until the value is stable or directly press ENTER key to read the present value, then the menu enter into manual calibration for Buffer After entering into manual calibration of Buffer 2 menu display (ph value twinkles), press upward or downward key to adjust the value to the selected buffer 1 value. After confirming, press ENTER key to enter into CA3 calibration menu display Under CA3 calibration menu display, if press MODE key to leave the calibration menu to finish it as a dual point calibration. The menu display shows slope value; for multi points calibration, clean the ph electrode with distilled water, put the electrode into third buffer solution and continue the calibration procedures After finishing whether single, dual to five points calibration(ct mode up to three points), press ENTER or wait for 3 seconds to show the slope value, the SENSITIVITY value, the ASYMMETRY value, the R2 value. Then after 3 seconds or press ENTER key to go back to measurement mode. 30

33 4.5 Define Buffers calibration (CD) After entering calibration mode, clean the ph electrode with distilled water, put the electrode into first buffer solution. Press CAL key to select CD1.. Press ENTER key to start to read the user-tailored method Buffer 1 value After entering into define calibration menu display, the buffer text in the display starts to twinkle. Press upward or downward key to select the user-tailored Buffer 1 value. Press ENTER key to enter into temperature value setting menu display Under temperature setting menu display(the temperature twinkles), press upward or downward key to adjust the temperature value. Or press upward and downward key simultaneously to back to the preset value--25c. Press ENTER key(if as ATC mode) to start to read the present value When reading the value, the Auto Read symbol in the display starts to twinkle. Wait until the value is stable or directly press ENTER key to read the present value After entering into define calibration of Buffer 1 menu display, press ENTER key or wait for 3 seconds to enter into CD2 calibration menu display Under CD2 calibration menu display, if press MODE key to leave the calibration menu to finish it as a single point calibration. The menu display shows slope value; for multi-point calibration, clean the ph electrode with distilled water, put the electrode into second buffer solution and press ENTER key to enter user-tailored calibration value menu display After entering into define calibration menu display, the buffer text in the display starts to 31

34 twinkle. Press upward or downward key to select the user-tailored Buffer 2 value. Press ENTER key to enter into temperature value setting menu display Under temperature setting menu display(the temperature twinkles), press upward or downward key to adjust the temperature value. Or press upward and downward key simultaneously to back to the preset value--25c. Press ENTER key(if as ATC mode) to start to read the present value When reading the value, the Auto Read symbol in the display starts to twinkle. Press ENTER key to read the present value After entering into define calibration of Buffer 2 menu display, press ENTER key or wait for 3 seconds to enter into CD3 calibration menu display Under CD3 calibration menu display, if press MODE key to leave the calibration menu to finish it as a dual point calibration. The menu display shows slope value; for multi-point calibration, clean the ph electrode with distilled water, put the electrode into third buffer solution and continue the calibration procedures After finishing whether single, dual to five points calibration, press ENTER or wait for 3 seconds to show the slope value, the SENSITIVITY value, the ASYMMETRY value, the R2 value. Then after 3 seconds or press ENTER key to go back to measurement mode. 32

35 4.6 ORP relative potential adjustment Under ph measurement mode, press MODE key to switch to the mv measurement mode. Press CAL key to enter relative potential adjustment mode. Press MODE key at any time to back to measurement mode Clean the ORP electrode with distilled water, put the electrode into ORP standard solution, and press CAL key enter into ORP relative potential adjustment Press ENTER key to read the value. The adjustable value in the menu display starts to twinkle. Press upward or downward key to adjust the value to the required value. Or press upward and downward key simultaneously to zero the value. Press ENTER for confirmation After displaying the adjusted value, wait for 3 seconds or directly press ENTER key to go back to measurement mode. 33

36 4.7 ION concentration calibration (SP-2500 only) The instrument applies the easiest and widely used ion-selective electrode direct potentiometry ISE, to measure the potential reaction of the solution. Establishing the relationship of ion concentration(activity) and electrode potential by calibration, the instrument then is able to start measurement. The measurement and calibration of electrode is necessary to refer to the operation manual of ION selective electrodes(ise). The method of calibration standard solution usually applies continuous dilution from high concentration standard solution in sequence to get 1000, 100, 10, 1 ppm(mg/l). In order to prevent from the difference of ISE activity and actual concentration, it is usually necessary to add ISAB (Ionic Strength Adjustment Buffer) when calibration for making the sample solution has similar ionic strength. It is recommended to use the calibration standard solution from low to high to prevent contamination of standard solution. If the concentration range of sample solution is known, it should be applied the nearest value of standard solution for calibration. If the sample measurement range and the standard solution calibration range have been confirmed to be in the linear range of the electrode, it is acceptable to make dual points calibration. However, making three of more points calibration can help to confirm whether the measurement is within the linear range or not. The calibration is up to 5 points calibration, and the instrument provides log(a) = the logarithm of the activity of the measured ion of linear regression calculation for the electrode potential(mv) and ion concentration(activity). It measures and displays the electrode s slope under 25C and the ratio of electrode actual slope with theoretical slope. It also displays the percentage of electrode sensitivity for judgment whether electrode is aged or contaminated. It also displays the linear regression R2 value (determination coefficient) of electrode and standard solution as the judgment of electrode regression suitability. Because the calibration slope is related the temperature, the measurement is compensated with temperature value. However, it is better to measure the standard solution and sample solution within ±2 C temperature difference. The definition of electrode slope determination: Slope The number of valence 48 ~ monovalent ion -48 ~ monovalent ion 24 ~ ion -24 ~ ion Note: If over range, the error message of slope failure is E

37 4.8 ION concentration calibration (CC) (SP-2500 only) For concentration calibration(cc) (up to 5 points calibration), select ppm or mg/l unit under measurement mode. Press CAL key to enter into ION concentration calibration mode. The instrument has built-in 10 sets selection of different standard solution value from: The minimum is 2 points calibration and up to 5 points calibration. Users may press MODE key at any time to finish the calibration and back to measurement mode Press CAL key to select CC1. If temperature mode is set as MTC (Manual), the temperature value starts twinkling. Press upward or downward key to adjust the temperature value. Or press upward and downward key simultaneously to back to the preset value--25c. Press ENTER key to start to read the preset standard solution No.1 value After entering into CC1 calibration menu display, the buffer text in the display starts to twinkle. Press upward or downward key to the required value. Press ENTER key to start to measure standard solution No When reading the value, the Auto Read symbol in the display starts to twinkle. Wait until the value is stable or directly press ENTER key to read and to display the standard solution No.1 s mv value Under the standard solution 1 menu display, wait for 3 seconds or press ENTER key to enter into CC2 calibration menu display Clean the electrode with distilled water, put the electrode into second standard solution Under CC2 calibration menu display. If temperature mode is set as MTC (Manual), the temperature value starts twinkling. Press upward or downward key to adjust the temperature value. Or press upward and downward key simultaneously to back to the preset value--25c. Press ENTER key to enter into standard solution No.2 menu display. 35

38 4.8.6 Under standard solution No.2 menu display. The concentration value starts twinkles, press CAL key to select concentration value, press upward or downward key to adjust it to the required value. Press ENTER key to read and to display the standard solution No.2 s mv value When reading the value, the Auto Read symbol in the display starts to twinkle. Wait until the value is stable or directly press ENTER key to read and to display the standard solution No.2 s mv value Under the standard solution 2 menu display, wait for 3 seconds or press ENTER key to enter into CC3 calibration menu display Under CC3 calibration menu display, if press MODE key to leave the calibration menu to finish it as a dual point calibration. The menu display shows slope value; for multi-point calibration, clean the ph electrode with distilled water, put the electrode into third standard solution and continue the calibration procedures After finishing whether dual or up to five points calibration, press ENTER or wait for 3 seconds to show the slope value, the SENSITIVITY value, the ASYMMETRY value, the R2 value. Then after 3 seconds or press ENTER key to go back to measurement mode. 36

39 5. Error messages Messages Reason Dispositions OFFSET(zero-point electric potential) value over range 1. Replace the buffer solutions 2. Maintain the electrode or replace the new electrode, and make another calibration. SLOPE value exceeds the upper or lower limit 1. Replace the buffer solutions 2. Maintain the electrode or replace the new electrode, and make another calibration. The readout is unstable During calibration, the buffer solution temperature exceeds the range of 5~50 C 2. The buffer can not be identified. Please check whether there is bubble or air in the glass end of the electrode; maintain the electrode or change a new electrode, and make another calibration. 1. Please adjust the buffer solution temperature to the appropriate temperature range and make another calibration. 2. Please replace the buffer, or maintain or replace the electrode and make another calibration. Serious error that does not permit any further measuring Please call service engineer. 37

40 6. Maintenance 6.1 Battery Replacement a. Turn off the instrument power first. b. Open the battery cover, and remove the old batteries. c. Put into the new AA batteries, and close the battery cover. 6.2 Electrode clean and maintenance Generally speaking, under normal operation, the transmitter produced by our company needs no maintenance expect regular cleaning and calibration of the electrode to ensure accurate and stable measurement and system operation. The cleaning cycle for the electrode depends on the pollution degree of the measurement sample. Normally, it is recommended to make weekly cleaning. The following chart gives introductions of different cleaning methods according to different type of contaminations to provide the operators with reference for cleaning and maintenance. Type of Contaminations Cleaning methods Measuring solutions containing proteins.contamination of the junction The electrode should be soaked in Pepsin/HCl for several hours. METTLER-TOLEDO 9891 Electrode Cleaner is recommended. Measuring solution containing The junction should be soaked in Thiourea/HCl solution sulfides.the junction becomes until being bleached. METTLER-TOLEDO 9892 black Electrode Cleaner is recommended. Contamination by grease or organic substance Short rinsing of the electrode with acetone and ethanol. Acid and alkaline soluble contaminations Rinsing the electrode with 0.1mol/l NaOH or 0.1mol/l HCl for a few minutes. Apply clean water to flash the electrode after above cleaning steps and immerse the electrode in 3M KCl solution for 15 minutes at least, and then calibrate the electrode. The electrode should only be rinsed and never rubbed or mechanically cleaned, since this would lead to electrostatic charges. This could cause an increase in the response time. In cleaning the platinum electrode, the platinum ring of the electrode can be rubbed gently with a wet soft piece of cloth. The frequency of electrode cleaning depends on the type and degree of contamination. However it is recommended that the electrode be cleaned once a week. 38

41 7. Modbus protocol and instructions 7.1 Function code In the original Modbus protocol definition, there are many command functions on the substance of duplication. Base on the reason, SP-2300/2500 only supports some of the function codes. When starting communication, the Master sends the request through function code to tell the Slave to perform which actions. The Slave responds function which is the same as that sent by the Master to indicate the Slave has already responded to the Master and has performed the action. The range of function code is 1~255. In between, the function code 128~255 are defined as abnormal responding function code. The function codes which the slaves normally respond are the same as those from the Master. The highest bit(msb) is 0. When the slaves respond abnormal message, the lowest bit(lsb) of function codes is the same as those of the master, however, the highest bit(msb) of the function codes are set to be 1. It means that there occurs a error when executing the function codes. The following table lists the function codes supported by SP-2300/2500 Function code Definition Operation 01H Read Coil Status 03H Read Holding Registers 05H Write Single Coil 06H Write Single Register 0FH Write Multiple Coils 10H Write Multiple Registers 08H Diagnostics Reads the ON/OFF status of discrete coils in the slave Read the binary contents of holding registers in the slave Writes a single coil to either ON or OFF. Writes a value into a single holding register Writes each coil in a sequence of coils to either ON or OFF Writes values into a sequence of holding registers Diagnostics function Read the status of one or more discrete contacts Read one or more data register value Set the status of discrete individual contacts to the specified address Set a single 16-bit data register Set the status of multiple discrete continuous contacts to the specified address Set multiple sequence of 16-bit data register The assessment of network communication capability 39

42 7.2 MODBUS name and address table Function Code03H, 06H, 10H Modbus response (setup parameter) Logic Number Information Description of data Default Item address of Byte type transmission value Note 0001H Equipment s ID 2 USHORT H Meter s model 6 USHORT ASCII Code SP2300 SP H Communication 0RTU 2 USHORT protocol 1ASCII 1 Serial transmission 0006H 2 USHORT speed (Baud rate) 0: None 0007H Parity 2 USHORT 1: Even 0 2: Odd 0008H USHORT Second 0009H USHORT Minute AH Real-time USHORT Hour BH clock* USHORT Day CH USHORT Month 000DH USHORT Year The actions without * sign only support for function code 03H. The actions with * sign support function code 03H, 06H, 10H. USHORT data range from 0 to 65535, SHORT data range from to FLOAT is a 4 data bits IEEE format float. The data range follows is the same. Function code: 03H Modbus response (measurement parameter) Logic Number of Information Description of data Item address Byte type transmission Number of 0031H measurement 2 USHORT channels 0032H Sign byte 6 CHAR 0035H 0037H ph/orp/ion measurement Temperature measurement 4 FLOAT 4 FLOAT Default value SP2300/SP2500 only has one channel 1 ph ORP(mV) C ppm(sp-2500 only) mg/l(sp-2500 only) ph/orp/ion (Ion SP-2500 only) measurement Temperature measurement Note ASCII code Data affected by sign byte Data affected by sign byte 40

43 8. Appendix Table 1 CT Mode Tech. Buffers TEMP Buffer 4.01 Buffer 7 Buffer Table 2 CN Mode NIST. Buffers(DIN 19266) TEMP Buffer 1.68 Buffer 4.01 Buffer 6.86 Buffer 9.18 Buffer

44 Table 3 CD Mode Define standard buffers table TEMP Buffer 1 Buffer 2 Buffer 3 Buffer 4 Buffer

45

46 SUNTEX INSTRUMENTS CO., LTD. 13F, No. 31, Lane 169, Kangning St., Xizhi Dist., New Taipei City, Taiwan (R.O.C.) Tel: Fax: C SP-2300_2500/Technical data subject to alternations/ Quality Systems ISO 9001/201111