IIR-FREON II FREON GAS TRANSMITTER/SENSOR INSTALLATION OPERATION AND MAINTENANCE MANUAL

Transcription

1 IIR-FRE II FRE GAS TRANSMITTER/SENSOR INSTALLATI OPERATI AND MAINTENANCE MANUAL INTEC Controls, Inc Distribution Ave., San Diego, CA Phone: (858) Fax: (858)

2 Table Of Contents READ BEFORE OPERATING GENERAL INFORMATI PRINCIPLE OF OPERATI KEY FEATURES APPLICATIS SPECIFICATIS INSTALLATI SENSOR LOCATI PHYSICAL DIMENSIS GAS SAMPLING MOUNTING AND SYSTEM WIRING Terminalsc...c Power Supply...c Wire and Cablec...c Digital Connectionc...c RS-485 Terminatorc...c RS-485 Driver Replacementc...c Isolated 4-20mA Analog Outputc...c9 3. 0FUNCTI AND CFIGURATI IIR-FRE II WORKING MODE SYSTEM INITIALIZATI KEYS AND POTS STATUS LED RS-485 INDICATORS RS-485 ADDRESSING GAS CALIBRATI CAL GAS CCENTRATI EQUIPMENT REQUIRED ZEROING CALIBRATI SPAN CALIBRATI MAINTENANCE CAL MA MODE AND POT CAL DVM CNECTI MA OUTPUT CALIBRATI MA OUTPUT CALIBRATI FACTORY POT CALIBRATI TROUBLESHOOTING...20 IIR-FREO N II O p e r a t i o n Ma nua l 1

3 READ BEFORE OPERATING All 0individuals 0who 0have 0or 0will 0have 0the 0responsibility 0of 0using, 0maintaining, 0or servicing 0this 0product 0must 0carefully 0read 0this 0manual. 0The 0product 0will 0perform 0as designed 0only 0if 0it 0is 0used, 0maintained, 0and 0serviced 0in 0accordance 0with 0the manufacturer s instructions. 1. CGeneral Information 1.1 gprinciple of Operation The 0IIR-FRE 0II 0Smart 0Sensor 0is 0a 0microprocessor 0controlled 0FRE 0gas 0Sensor 0or Transmitter using infrared sensing technology. The concentration of Freon is measured by determining the amount of absorption of light in a specific frequency band. As 0most 0gases 0have 0their 0characteristic 0spectra 0in 0the 0infrared. 0Those 0spectra 0derive 0from the 0molecule's 0composition 0in 0such 0a 0way 0that 0no 0two 0molecular 0gases 0have 0the 0same 0IR spectrum. 0IR 0spectra 0are 0the 0fingerprints 0of 0gases, 0and 0thus 0allow 0gases 0to 0be 0uniquely identified. By 0transmitting 0a 0beam 0of 0IR 0radiation 0through 0the 0air, 0or 0through 0any 0particular 0gas volume, and recording how much is transmitted at selected spectral lines, one may decide which 0gases 0are 0present 0and 0how 0much 0of 0each. 0This 0is 0a 0standard 0and 0well-proven principle, 0routinely 0used 0in 0laboratory 0analyses 0of 0chemical 0species, 0and 0is 0also 0the 0basis on which our sensors are made. An 0IR 0detector 0is 0essentially 0a 0temperature 0sensor 0and 0is, 0therefore, 0potentially 0very sensitive 0to 0changes 0in 0the 0ambient 0temperature. 0However, 0our 0IIR-Freon 0II 0smart 0sensor modules 0do 0it 0better, 0faster, 0and 0more 0precisely. 0The 0IIR-FRE 0II 0smart 0sensors 0are entirely electronic with no moving parts, and are built around our unique QT Gas Sample Cell with constant temperature control integrated with IR Source and IR Detector together. This makes our IR smart sensors work from -45 C to 65 C without being susceptible to ambient temperature fluctuations. IIR-FREO N II O p e r a t i o n Ma nua l 2

4 Comparing 0with 0conventional 0gas 0detector, 0gases 0to 0be 0detected 0are 0often 0corrosive 0and reactive. 0With 0most 0sensor 0types, 0the 0sensor 0itself 0is 0directly 0exposed 0to 0the 0gas, 0often causing 0the 0sensor 0to 0drift 0or 0die 0prematurely. 0The 0main 0advantage 0of 0IR 0sensor 0or transmitter 0is 0that 0the 0detector 0does 0not 0directly 0interact 0with 0the 0gas 0(or 0gases) 0to 0be detected. 0In 0the 0IIR-Freon 0II 0Smart 0Sensor, 0the 0major 0functional 0components 0are 0protected with 0optical 0parts. 0In 0other 0words, 0gas 0molecules 0interact 0only 0with 0a 0light 0beam. 0The 0IR Source 0and 0IR 0Detector 0can 0be 0treated, 0making 0them 0resistant 0to 0corrosion, 0and 0are designed such that they are easily removable for maintenance or replacement. 1.2 gkey Features Infrared Sensing Technology Constant Temperature QT Gas Sampling Cell Standard RS-485 Output with OptoMux protocol Standard Isolated 4-20mA Analog Output Diffusion Sampling module No moving parts in diffusion model Water and corrosion resistant PVC enclosure NEMA 4, 4X Addressable from 0 to 31 Calibration Buttons and Remote Calibration Available Operation at 20 28VDC or 20 28VAC Status/Error LED, TX/RX LED, IR-Source LED, 4-20mA Status LED CSA/UL approval (pending) 1.3 gapplications The IIR-FRE II is designed to monitor for the loss of refrigerant gas in a variety of applications: Mechanical equipment rooms Propellant filling operations Solvent cleaning stations Cold storage and transport facilities Meat packing plants Supermarkets and refrigerant storage locations Other specialty applications using halocarbons IIR-FREO N II O p e r a t i o n Ma nua l 3

5 1.4 gspecifications Input Power: 024VDC nominal, range 20 to 28VDC 24VAC nominal, range 20 to 28VAC 0 Fuse: 0F1 on Main Board: Polyswitch 1.6A F1 on Power Board: 2A Very Fast-Acting Fuse Littelfuse: Axial Lead and Cartridge Fuse Part Number: Sensor: Gas Detected: Range: Accuracy: Repeatability: Sampling: Output Signal: Infrared Freon R134a, R123, R22, R11 R12, R13, R14, R21, R23, R31, R32, R41, R113, R114, R115, R116, R125, R143a, R152, R161 0 to 100ppm for R123; 0 to 1000ppm for others ±3% of reading ±1% of full scale Diffusion RS-485 with OptoMux protocol Available Controller: M-Controller Q4 Controller Isolated 4-20mA Analog Signal Enclosure Rating: IP 66 & NEMA 4, 4X, 12 & 13 Cover Screws should be torqued to 2.5lbs-in (30cN-m) Operating Temperature: -45 C to 65 C Ambient Humidity: 5% to 95% RH (non-condensing) Storage Temperature: -45 C to 70 C Size: Weight: 200mm X 120mm X 90mm Less than 1.5lbs (0.680 kg) IIR-FREO N II O p e r a t i o n Ma nua l 4

6 2. Installation 2.1 Sensor Location Several factors should be considered when selecting locations to install sensors. The following general suggestions should be considered to assure the detection of the target gas. Select the most suitable location for each sensor. 1. Air Currents: If there are fans, winds, or others sources of air movement, gases may tend to rise or collect in certain areas of a facility. The local air currents should be assessed to aid in selecting the sensor location. In outdoor situations considerations such as prevailing winds should be accounted for. Air convection can often be more important in determining gas concentrated areas than factors of Vapor Density. 2. Vapor Density: R11, R22, R123 and R134a are heaver than air. Detecting location should be 9-18 inch (0.23m to 0.46m) above the floor. 3. Gas Emission Sources: As a rule, at least one sensor should be located in close proximity to each point where a leak is likely to occur. This is particularly important when a liquid having a low volatility is monitored. 4. Environmental Factors: Designed to rugged outdoor use consider the following in selecting locations. Install sensors where they will be protected from wind, dust, snow, water, vibration and shock. 2.2 Physical Dimensions IIR-FREO N II O p e r a t i o n Ma nua l Rev A

7 2.3 ggas Sampling The 0IIR 0FRE 0II 0gas 0sampling 0system 0is 0composed 0of 0a 0diffusion 0type 0gas 0sample chamber 0and 0two 0vent 0holes. 0The 0gas 0flows 0in 0and 0out 0through 0the 0two 0vent 0plugs 0on 0the bottom of the IIR-FRE II enclosure. See above picture. 2.4 gmounting and System Wiring NOTE: 1The 1Diffusion 1version 1IIR-FRE 1II 1smart 1sensor 1should 1be 1mounted 1 1foot (30cm) from the floor. IIR-FREO N II O p e r a t i o n Ma nua l 6

8 2.4.1 Terminals Power Board Terminals Power Supply NOTICE: Installing or using this equipment in a manner not specified by the manufacturer could cause electric shock, bodily injury, or risk of fire. Power Supply: Voltage: ~ 24 ± 4 VAC 50/60Hz 1.0A AC Total max. 24 ± 4 VDC 1.0A DC Total max. Note: AC Power must be non-grounded (floating). Note: No external over-current protection is required. Over-current protection is provided by means of fuses F1. Fuse F1: 2A Very Fast-Acting Fuse and Must be CSA/UL approved Littelfuse: Axial Lead and Cartridge Fuse Part Number: IIR-FREO N II O p e r a t i o n Ma nua l Rev A

9 2.4.3 Wire and Cable The terminal block plug TB1 accepts 12 AWG to 24 AWG wire, Use 16 AWG or 18 AWG wire for Power Supply in long wiring runs, which can be up to 1km (1,000 meters) long. We recommend using BELDEN 9841 for communications. This wire has 120 ohm input impendence, which will eliminate RS-485 communication problems Digital Connection RS-485 Terminator The terminator on each end of the RS485 loop is designed to match the electrical impedance characteristic of the twisted pair loop, and will prevent signal echoes from corrupting the data on the line. The terminator should be enabled on BOTH ends of the RS485 loop. Short and medium length modbus/485 loops can operate without the terminating resistor. Longer runs may require the terminating resistors. But adding terminator dramatically increases power consumption. IIR-FREO N II O p e r a t i o n Ma nua l Rev A

10 Factory default setting is disabled terminator. The IIR-FRE II smart sensor supplies this resistor on the main board, and it is chosen using a jumper at J6. J6 1-2: Terminator Disabled / OFF (default) J6 2-3: Terminator Enabled / RS-485 Driver Replacement RS-485 0lines 0in 0heavy 0industrial 0environments 0are 0sometimes 0subjected 0to 0magnetic disturbances 0causing 0sufficient 0inducted 0power 0surges 0to 0damage 0the 0driver 0integrated circuit 0(IC). 0This 0IC 0U14 0is 0socketed 0on 0the 0circuit 0card 0for 0ease 0of 0replacement 0in 0the field Isolated 4-20mA Analog Output IIR-FRE 0II 0can 0provide 0one 0channel 0isolated milliamp 0analog 0outputs 0with 1no need for separate power supply. The maximum output impedance is 600 ohms. The minimum isolation voltage is 1000 Vrms. IIR-FREO N II O p e r a t i o n Ma nua l 9

11 Connection 0Indicator 0will 0be 0turned 0on 0when 04-20mA 0loops 0are 0connected 0and 0will 0be turned off if the 4-20mA loops are open. Test 0point 0SIG+ 0and 0SIG- 0are 0used 0to 0measure 0the 0current 0online 0when 0the 0IIR-FRE 0II is working in the field. The 0module 0can 0also 0be 0used 0to 0output 02-10VDC 0if 0the 0Jump 0J is 0connected. 0The default setting: J2 1-2 is connected that mean the output is 4-20mA analog output. IIR-FRE 0II 0outputs 04mA 0or 02VDC 0at 0ppm, 0outputs 020mA 0or 010VDC 0at 0Full 0Scale. For 0example, 0for 0R123, 0it 0outputs 020mA 0at 0100ppm, 0for 0R134a, 0R22 0and 0R11, 0it 0outputs 20mA at 1000ppm. The IIR-FRE II will draw a straight line between. If there is any fault found in IIR-FRE II, it will output 2.5mA to indicate the fault. IIR-FREO N II O p e r a t i o n Ma nua l 10

12 3. CFunction and Configuration 3.1 giir-freon Working Mode IIR-FRE II has four kinds of working mode: Warm-up Mode: It allows IIR-FRE II to heat up Optical Block and initialize components Monitoring Mode: SW1 position 6 is switched OFF. It allows IIR-FRE II to measure the gas concentration and output signals. Calibrate ma Mode: SW1 position 6 is switched It allows IIR-FRE II to calibrate 4mA and 20 ma outputs. Adjust ma Mode: A key is pressed and hold when in Calibrate ma Mode It allows IIR-FRE II to adjust 4mA and 20 ma outputs. 3.2 gsystem Initialization When the IIR-FRE II smart sensor is turned on, it initializes hardware and software. As the 0transmitter 0is 0warming 0up, 0the 0optical 0block 0is 0heated 0to 0a 0constant 0temperature, 0the status 0LED 0blinks 0at 050% 0duty 0 0which 0indicates 0the 0transmitter 0is 0in 0warming-up procedure. In 0warming-up 0procedure, 0the 0reading 0of 0the 0transmitter 0will 0always 0be 0zero 0and 0the analog 0output 0will 0always 0be 04mA. 0M-Controller 0and 0Q4 0Controller 0will 0display Warming 0up 0in 0their 0LCD 0display 0panel. 0The 0time 0for 0warming-up 0procedure 0depends on 0the 0ambient 0temperature. 0The 0lower 0the 0ambient 0temperature 0is, 0the 0longer 0it 0takes. Normally, it takes 5 minutes during the warming-up procedure. After 0warming-up 0procedure, 0the 0transmitter 0automatically 0starts 0testing 0for 0errors. 0If there are no errors, the Status LED is turned constantly. If there is an error, the Status LED 0blinks 0once 0every 0second 0and 0the 04-20mA 0analog 0outputs 02.5mA. 0An 0error 0message will display on the M-Controller or Q4 Controller panel. NOTE: 1If 1the 1Status 1LED 1blinks 1twice 1every 1second, 1check 1SW1 1position 16, 1make sure the position 6 is switched OFF, which makes the IIR-FRE II work in Normal Monitoring Mode, rather than in Cal ma Mode. When the transmitter is powered up, the IR Source LED on Lamp Board blinks all the time. If the IR Source LED is always or OFF, that means the IR Source in the optical block has problem or the driver for the IR Source has problem. Refer to Section 5: Troubleshooting for IR Source. IIR-FREO N II O p e r a t i o n Ma nua l 11

13 Keys IIR FREO N II O p e r a t i o n And Ma i nt e na nce Ma nua l 3.3 g and Pots IIR-FRE II has two keys and two pots on main board. Key SW3 is named Zeroing CAL, CAL 4mA and - Key SW2 is named Span CAL, CAL 20mA and + Pot W1 is named ZERO POT Port W2 is named CAL POT The two keys perform different functions in different working mode: In Monitoring Mode: The two keys are used as Zeroing CAL and Span CAL. o When key Zeroing CAL is pressed, it will perform zeroing calibration. o When key Span CAL is pressed, it will perform span calibration. In CAL ma Mode: The two keys are used to calibrate 4mA and 20mA output. o When key CAL 4mA is pressed, it will output 4mA or 2VDC. o When key CAL 20mA is pressed, it will output 20mA or 10VDC. o When key CAL 4mA is pressed and held for 3 seconds, it will enter Adjust 4mA Mode. o When key CAL 20mA is pressed and held for 3 seconds, it will enter Adjust 20mA Mode. In Adjust ma Mode: The two keys are used to adjust 4mA and 20mA output. o When key - is pressed, it will decrease the output signal. o When key + is pressed, it will increase the output signal. In Warm-up Mode: The two keys cannot be used as Zeroing CAL and Span CAL, but they can be used for calibrating 4-20mA output. The two pots are used to adjust zeroing gain and calibration gain when the unit is in the factory calibration procedure. Do not attempt to modify or adjust the two pots in the field. IIR-FREO N II O p e r a t i o n Ma nua l 12

14 3.4 Status LED The Status LED indicates the status of the transmitter is running: Always : Normal monitoring mode Blink once every second: Fault report Blink twice every second: Cal ma Mode Blink 50% duty on: Warming up mode or Adjust ma Mode 3.5 RS-485 Indicators When the transmitter is connected to a M-Controller or Q4 Controller, the traffic of the communication can be monitored visually through the two RS-485 indicators, one is RX LED, which indicates the data stream received in the transmitter. The other is TX LED, which indicates the data stream out from the transmitter. If the TX LED or the RX LED is always, that means the communication has problem. Refer to Section 5: Troubleshooting for RS-485. IIR-FREO N II O p e r a t i o n Ma nua l Rev A

15 3.6 grs-485 Addressing M-Controller supports RS-485 addressing from 0 to 31 for digital sensor. Q4 Controller supports RS-485 addressing from 0 to 3 for digital sensor. The 0IIR-FRE 0II 0smart 0sensor 0RS-485 0address 0can 0be 0defined 0from 0 0to 031 0by 0using DIPSWITCH 0SW1 0position 01 0to 05. 0Position 06 0is 0used 0to 0define 0CAL 0Gas 0concentration for Span Calibration. SW1 ADDRESS7CAL 4-20mA : 1 OFF: Default Address: ADDRESS ADDRESS ADDRESS ADDRESS ADDRESS ADDRESS ADDRESS ADDRESS ADDRESS ADDRESS ADDRESS ADDRESS ADDRESS ADDRESS ADDRESS ADDRESS ADDRESS ADDRESS ADDRESS ADDRESS ADDRESS ADDRESS ADDRESS ADDRESS ADDRESS ADDRESS 25 ADDRESS ADDRESS 27 ADDRESS ADDRESS 29 ADDRESS 30 ADDRESS 31 IIR-FRE II Address SW1 Setting IIR-FREO N II O p e r a t i o n Ma nua l 14

16 4. CGas Calibration Calibration 0should 0not 0vary 0significantly 0over 0a 0period 0of 0years; 0however, 0it 0is 0best 0to perform 0a 0verification 0calibration 0after 0installation, 0and 0at 0one-year 0intervals 0thereafter. All units are factory calibrated. The 0IIR-FRE 0II 0smart 0sensor 0is 0calibrated 0using 0a 0two-point 0calibration 0process. 0First, use 0a 0 Zero 0Gas, 0then 0use 0a 0 CAL 0Gas 0containing 0a 0known 0concentration 0of 0a 0standard reference gas, to set the second point of reference. 4.1 gcal GAS Concentration The IIR-FRE II uses full scale as its CAL GAS concentration: Basically, IIR-FRE II full scale for all Freon gases is 1000ppm except for R123, which is 100ppm. Gas Type Full Scale Cal Gas Concentration R134a 1000ppm 1000ppm R ppm 100ppm R ppm 1000ppm R ppm 1000ppm Others 1000ppm 1000ppm IIR-FREO N II O p e r a t i o n Ma nua l 15

17 4.2 gequipment Required A cylinder of Zero Gas, (clean air or nitrogen). A cylinder of Cal Gas Flow Limiting Regulator(s) 0.4 to 0.6 lpm for Diffusion Version Tubing and calibration adapter. 4.3 gzeroing Calibration Note: Zeroing Calibration must be performed before Span Calibration. Note: 1Make 1sure 1SW1 1position 16 1is 1OFF, 1that 1means 1the 1IIR-FRE 1II 1is 1in Monitoring Mode, rather than in CAL ma Mode. 1. 0For Diffusion Version: Open the enclosure of the IIR-FRE II smart sensor Connect the zero gas supply tubing to the push-in fitting on the optical block 2. Turn on the gas flow. 3. Waiting for about 3 minutes or the reading on Controller panel is stable or 4-20mA Analog Signal Output is stable 4. Push and hold the button Zero / Cal 4mA for one second, and then release the button, the Status LED will blink for 15 to 30 seconds and then be constant ; the zero calibration data is saved. 5. If the Status LED is constantly blinking, that means something is wrong in the Zeroing procedure, repeat procedure 4 to try again, if the Status LED continue blinking, the unit needs to be repaired in factory, otherwise, Zeroing Calibration has succeeded, go to procedure Turn off the gas flow and remove it. IIR-FREO N II O p e r a t i o n Ma nua l 16

18 4.4 gspan Calibration 1. 0For Diffusion Version: Open the enclosure of the IIR-FRE II smart sensor Connect the cal gas supply tubing to the push-in fitting on the optical block 2. 0Turn on the gas flow. 3. 0Waiting 0for 0about 03 0minutes 0or 0the 0reading 0on 0Controller 0panel 0is 0stable 0or 04-20mA Analog Signal Output is stable 4. 0Push 0and 0hold 0the 0button 0 CAL 0/ 0Cal 020mA 0for 01 0second, 0and 0then 0release 0the button, 0the 0Status 0LED 0will 0blink 0for 015 0to 030 0seconds 0and 0then 0be 0constant 0, 0that means the IIR-FRE II sensitivity is acceptable; the span calibration data is saved. 5. 0If 0the 0Status 0LED 0is 0constantly 0blinking, 0that 0means 0the 0IIR-FRE 0II 0sensitivity 0is unacceptable. Repeat procedure 4 to try again, if the Status LED continue blinking, it may be necessary to clean or replace the Optical Block Assembly, the unit needs to be repaired in the factory. 6. Turn off the gas flow and remove it. IIR-FREO N II O p e r a t i o n Ma nua l 17

19 5. CMaintenance 5.1 gcal ma Mode and Pot CAL CAL 0mA 0Mode 0and 0Port 0CAL 0are 0used 0during 0factory 0calibration 0and 0should 0not 0require recalibration in the field. Do not attempt to modify these settings in the field. Changing these values will change the analog output signal scale. Warning: 1This 1procedure 1is 1part 1of 1factory 1setup. 1In 1most 1circumstances 1it 1will not 1be 1necessary 1to 1perform 1this 1procedure 1in 1the 1field. 1These functions require the use of precision reference instrumentation. 5.2 gdvm Connection IIR-FRE II is Offline: o Switch DVM to measure DC current, plug the probe - into IGND and plug the probe + into SIG-. The LED D6 will be constant. IIR-FRE II is Online: o Switch DVM to measure DC current, plug the probe - into SIG - and plug the probe + into SIG +. The LED D6 will be short and turned OFF. 5.3 g4ma Output Calibration SW1 ADDRESS7CAL 4-20mA : 1 OFF: Default Address: 1 SW1 position 6 can force IIR-FRE II into CAL ma Mode o position: Calibrate 4 or 20mA Mode o OFF position: Normal Monitoring Mode Calibrate 4mA Output procedure: 1. 0Switch SW1 position 6 to 2. 0Status-LED will Flash Twice, that means the IIR-Freon II is in Cal 4-20mA Mode IIR-FREO N II O p e r a t i o n Ma nua l 18

20 3. 0Without key press, the DVM reading is the real time current output 4. 0Press key [4mA CAL] shortly, it outputs 4mA for verify 5. 0Press key [20mA CAL] shortly, it outputs 20mA for verify 6. 0Press and hold key [4mA CAL] for 3 second, or till the Status-LED is flash at 50% duty, that means the 4mA can be adjusted now. 7. 0Press [4mA CAL] to reduce the output; Press [20mA] to increase the output; 8. 0Adjust the output to 4.00 to 4.05mA 9. 0Switch SW1 position 6 back to OFF, then the settings will be accepted and saved in IIR-Freon II. 10. If there is no key pressed for 60 seconds before the SW1 position 6 is switched back to OFF, the IIR-Freon will exit 4mA adjust mode and return to step g20ma Output Calibration Calibrate 20mA Output procedure: 1. 0Switch SW1 position 6 to 2. 0Status-LED will Flash Twice, that means the IIR-Freon II is in Cal 4-20mA Mode 3. 0Without key press, the DVM reading is the real time current output 4. 0Press key [4mA CAL] shortly, it outputs 4mA for verify 5. 0Press key [20mA CAL] shortly, it outputs 20mA for verify 6. 0Press and hold key [20mA CAL] for 3 second, or till the Status-LED is flash at 50% duty, that means the 20mA can be adjusted now. 7. 0Press [4mA CAL] to reduce the output; Press [20mA] to increase the output; 8. 0Adjust the output to to 20.05mA 9. 0Switch SW1 position 6 back to OFF, that means the settings will be accepted and saved in IIR-Freon II. 10. If there is no key pressed for 60 seconds before the SW1 position 6 is switched back to OFF, the IIR-Freon will exit 20mA adjust mode and return to step Factory Pot Calibration Switch DVM to measure DC Voltage, plug the probe - into AGND on Main Board and plug the probe + into TP3 on Main Board. Apply Zero Gas, Slowly adjust ZERO POT to make the output of TP3 at 1.235V ± 0.025V. Apply CAL Gas, Slowly adjust CAL POT to make the output of TP3 at 4.500V ± 0.050V. (For R123, the TP3 is 2.500V ± 0.050V) Perform Gas Calibration again by pressing the two calibration keys. IIR-FREO N II O p e r a t i o n Ma nua l 19

21 6. Troubleshooting This troubleshooting guide is intended as an aid in identifying the cause of unexpected behavior and determining whether the behavior is due to normal operation or an internal or external problem. SYMPTOMS PROBABLE CAUSE SUGGESTED SOLUTI RS-485 RX LED or TX LED constantly Status LED is blinking on 50% duty RS-485 bus connection has problem RS-485 Driver U14 is damaged Controller side RS-485 Driver has problem In Warming up process Temperature sensor broken Heater is broken Disconnect the Cable to isolate the problem Replace U14 IC on main board Replace RS-485 Driver in Controller Wait for the block to warm up Check IR Detector Assembly Check IR Detector Assembly Status LED is blinking once every second Temperature Sensor Fault IR Source or Lamp Dirty Gas Sample Cell Dirty Signal Fault Lamp Short/Open Calibrating Error Other Error Check IR Detector Assembly Return to Factory Return to Factory Return to Factory Check IR Source Assembly Recalibration or Check Gas Flow or Use different calibration gas or Replace weak IR Source Assembly or Replace Broken IR Detector Assembly Return to Factory IR Source LED is constant or OFF, not blinking Main Board has problem Heater is short/open Check Firmware and Driver Check IR Source Assembly Reading abnormally high or low or jumping around randomly Dirty Sensor Block Excessive moisture Weak IR Source Temperature Sensor Loose Return to Factory Add filter to gas inlet Replace IR Source Assembly Check IR Detector Assembly IIR-FREO N II O p e r a t i o n Ma nua l Rev A