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© 2020 All rights reserved. Data subject to change without notice. 

cGas Detector Analog Transmitter - Operation Manual 

Rev. B | 2020.07

Signal output and supply should be in shielded cable. The cable shield should 

be connected to earth ground at the controller/power supply that is providing 

power for the cGas.

If the cGas Detector is being connected to either a QCC or FCS the supply 

voltage will either be supplied by the QCC or FCS and any additional power 

requirements of the system will be supplied by RPS-24VDC Remote Power 

Supply devices. In an analog configuration, a dedicated 4-20 mA signal wire is 

connected to each transmitter and only the ground and power wires are daisy 

chained. 

CGAS-A Connected to an FCS or QCC Controller (3-wire VDC)

If the cGas Detector is being connected to a BAS, DDC or other control panel 

then either a 24 VDC power supply or 24 VAC Class 2 or better transformer 

need to be used.

In all cases the voltage supply to the cGas Detector should never drop below 16 

Summary of Contents for CGAS-A Series

Page 1: ...Rev B 2020 22 www critical environment com CGAS A CO2 Detector Analog Transmitter Installation Operation Manual...

Page 2: ...9 2 2 Key Features 9 3 INSTRUMENT SPECIFICATIONS 10 3 1 Technical Specifications 10 3 2 Enclosure Dimensions 13 4 SENSOR SPECIFICATIONS 13 4 1 Available Internal Gas Sensors 13 4 2 Optional RH Temper...

Page 3: ...es 25 7 4 Display Settings 27 7 4 1 Adjust Display Brightness 27 7 4 2 Display Information Normal or Minimal 28 7 4 3 Display or Hide Gas Channel RH Temperature Readings 28 7 5 Alarm Status Fault Dete...

Page 4: ...Null Calibration 43 9 2 3 Span Calibration 44 9 3 Troubleshooting Zero and Span Calibration 45 9 3 1 Calibration Adapter Plug Doesn t Fit 46 9 3 2 Zero Fault 46 9 3 3 Span Fault 46 9 3 4 Zero Overrid...

Page 5: ...fied electrician or factory trained technician and according to instructions indicated in this manual This instrument should be inspected and calibrated regularly by a qualified and trained technician...

Page 6: ...is only to be used for the purposes stated in the manual Critical Environment Technologies is not liable for auxiliary interfaced equipment or consequential damage Prior to shipping equipment to CETC...

Page 7: ...yright laws this manual may not be copied or translated in whole or in part in any manner or format without the written permission of CETCI Modbus is a registered trademark of Gould Inc Corporation BA...

Page 8: ...the manufacturer reserves the right to make changes at any time without notice In addition due to improvements made to our products there may be information in this manual that does not exist in the...

Page 9: ...2 The sensors utilized in this device are accurate enough to measure to Occupational Health Safety OHS hazardous levels for toxic gases The transmitter operates by diffusion 2 2 Key Features Single ch...

Page 10: ...installed Copper coated interior to reduce RF interference Weight 400 g 14 oz Size 127 mm x 127 mm x 71 mm 5 0 in x 5 0 in x 2 8 in Conduit Entry Points 12 7 mm 1 2 in diameter Mounting Holes 4 47 mm...

Page 11: ...eferenced 3 conductor shielded 18 AWG or larger stranded within conduit Fuses Automatic resetting thermal INPUT OUTPUT Analog Output One Linear 4 20 mA output signals gas reading RH Temperature Option...

Page 12: ...TIFICATION ACNOR COUVRE UNIQUEMENT LES RISQUES DE CHOC ELECTRIQUE ET D INCENDIE D ORIGINE ELECTRIQUE Conforms to CSA C22 2 No 205 12 UL508 Edition 18 2018 Conforms to EMC Directive 2014 30 EU EN 50270...

Page 13: ...Rev B 2020 07 cGas Detector Analog Transmitter Operation Manual 3 2 Enclosure Dimensions 4 SENSOR SPECIFICATIONS 4 1 Available Internal Gas Sensors Infrared Sensors Part Numbers Range Lifespan Carbon...

Page 14: ...tive humidity and temperature sensor the analog output signal be used to send the gas reading signal to a controller or BAS DDC Therefore the RH temperature readings are for display purposes only ther...

Page 15: ...ures door shut Lock Slot For security padlock or tie 5 2 Interior System Layout NUMBER FEATURE FUNCTION Programming Buttons Access menu options and program functions using buttons inside the enclosure...

Page 16: ...sidering the gas readings to be accurate If the device is not installed within two weeks of delivery the sensor may require a longer warm up time to stabilize approximately 48 hours and provide accura...

Page 17: ...components except the sensors 6 2 Protection Against Electrical Risks Disconnect all power before servicing There may be multiple power sources Power supply may have a building installed circuit break...

Page 18: ...ce the door hinges over the installed base hinges with the unit fully open and push towards the wall The hinges should easily snap back into place The enclosure has one screw securing the door to the...

Page 19: ...on the conduit hub entering the cGas Detector enclosure must be liquid tight type Any water or physical damage to the transmitter that occurs from the installer drilling their own installation holes w...

Page 20: ...r electrical equipment may interfere with the response of the gas detectors 6 4 3 Mounting Height The sensor mounting height depends on the molecular weight of the gas in relation to the molecular wei...

Page 21: ...tom NUMBER FEATURE Door Hinge Conduit Entry Points 12 7 mm 1 2 in diameter 6 6 Wiring Connections The cGas Detector analog transmitter is a low voltage powered device Any application of operating volt...

Page 22: ...ther be supplied by the QCC or FCS and any additional power requirements of the system will be supplied by RPS 24VDC Remote Power Supply devices In an analog configuration a dedicated 4 20 mA signal w...

Page 23: ...re can pull a soldered terminal strip completely off a circuit board and this will not be covered under warranty 6 6 1 Analog Wire Gauge vs Run Length The table below shows the maximum cable length be...

Page 24: ...and Warm up Process From Factory Upon application of power to a cGas Detector shipped from the factory the LCD display will turn on and rotate through several info screens that differ depending on th...

Page 25: ...UP button A line under a character or number indicates that is the space into which you are entering a character or number Use the ENTER button to move to the next space Or use the UP or DOWN button t...

Page 26: ...elected Alarm Level Set Alarm Setpoint Set Alarm Direction Ascending Descending Set Alarm Hysteresis Fault Reading 3022 Config Menu Selected Channel Enable Disable Channel Read from Sensor Write to Se...

Page 27: ...version the gas type and AD counts the channel number gas type and gas level and temperature and relative humidity if option is installed 7 4 1 Adjust Display Brightness The brightness of the display...

Page 28: ...n display press ENTER Enter passcode 1014 using the UP button and ENTER button Enter Password 1014 Press ENTER to access the Display Menu DisplayMenu Press Enter Display Type Normal Press ENTER Use th...

Page 29: ...ts present condition press ENTER Use the UP button to choose Hidden or Unhidden and press ENTER to save and Exit Repeat for each channel you want to hide or unhide 7 5 Alarm Status Fault Detection and...

Page 30: ...ot to show on the display you must hide the line Refer to Section 7 4 3 Display or Hide Gas Channel RH and or Temperature Readings NOTE The cGas Detector has one gas channel Enabling the temperature a...

Page 31: ...38 RH 7 7 Setting Channel Alarm Setpoints Direction and Hysteresis NOTE The cGas Detector DOES NOT HAVE an internal alarm Alarm setpoints should be configured at the controller or BAS DCC Configuring...

Page 32: ...the alarm condition will stop when the gas reading goes below the alarm setpoint For example if the alarm setpoint is 100 ppm and the hysteresis is 5 ppm when the gas concentration reaches or exceeds...

Page 33: ...Press ENTER and continue Selected Alarm Mid Alarm Press the Up button until you see Alarm Setpoint confirm the desired number is showing Alarm Setpoint 800 PPM If you want to enter a different alarm s...

Page 34: ...m Celsius to Fahrenheit or vice versa very easily From the main display press ENTER Enter passcode 3032 using the UP button and ENTER button Enter Password 3032 Press ENTER to access the Calibrate Men...

Page 35: ...ring the ambient temperature or relative humidity you can adjust the reading by setting an offset value so the reading is more accurate The Temperature offset value is a number of degrees in either di...

Page 36: ...ut and will stop the analog output from sending a signal to the controller or control panel This may be useful if you need to perform maintenance on or replace the transmitter NOTE If the analog outpu...

Page 37: ...s expected From the main display press ENTER Enter passcode 0001 using the UP button and ENTER button Enter Password 0001 Press ENTER to access the Test Menu Test Menu Press Enter In the Test AO menu...

Page 38: ...r board is installed the information it contains must be written to the main circuit board 8 1 How to Replace a New Smart Sensor Board Smart board replacement sensors arrive pre calibrated and factory...

Page 39: ...nu Press Enter In the Selected Channel menu confirm the desired channel is showing Selected Channel CH1 CO2 Press the UP button to find Read From Sensor Press ENTER Read from Sensor CH1 Left Read from...

Page 40: ...change from NO to YES and press ENTER to select The system will Write the sensor configuration information to the smart sensor board 9 CALIBRATION 9 1 Calibration Specifications 9 1 1 Gas Calibration...

Page 41: ...C or use the Cal Clip hands free adapter part number CET SGC 9 1 4 Calibration Frequency Follow local codes and regulations OHS applications Once every 6 months OHS Occupational Health Safety For best...

Page 42: ...he calibration gas cylinder you are using This is especially important if you are not using the same Cal gas concentration that was used previously to calibrate the device How much gas the sensor dete...

Page 43: ...gen gas for 4 minutes before entering the Calibrate Zero menu From the main display press ENTER Enter passcode 3032 using the UP button and ENTER button Enter Password 3032 Press ENTER to access the C...

Page 44: ...et gas to correct drift and keep linearity NOTE To exit the Span Calibration at any time press ENTER When calibrating a CO2 sensor flow the span gas for 4 minutes before entering the Calibrate Span me...

Page 45: ...the Span calibration was accepted press ENTER and use the UP button navigate to Exit and press ENTER to exit Remove the cylinder of span gas If the Span calibration was not successful refer to Section...

Page 46: ...gen long enough or if the sensor detects ambient gas readings that are at an unacceptable level due to not enough clean air there is enough residual target gas in the environment or other gases that a...

Page 47: ...above the fault limit the display will indicate that an override is required To override the value use the UP button to select Y and press ENTER To keep the original value leave the indicator on N an...

Page 48: ...Y Press ENTER to make another adjustment to the number confirm and repeat until the desired current output is reached on the multi meter in this example keep adjusting the number until the multimeter...

Page 49: ...and when attached the enclosure meets IP54 standards To calibrate a device with a splash guard use the Cal Clip NOTE The splash guard will slow down the response time of the sensor 10 2 Calibration Ad...

Page 50: ...are openings in the front to allow gas and air to flow through to the sensor With only four slotted mounting holes installation and removal for gas detector servicing is easy Enclosure 16 gauge galvan...

Page 51: ...ly no maintenance other than regular calibration of the sensor s There are no replaceable components except the sensors The transmitter should be monitored for possible damaging conditions The sensor...

Page 52: ...e Span passes but the gas level reading keeps climbing Start the calibration process over Flow the nitrogen gas for 4 minutes before entering the Calibrate Zero menu Then flow the span gas for 4 minut...

Page 53: ...d Fault cGas cannot communicate with the smart board Ensure the smart board is installed and installed on the correct side left if a single channel unit Otherwise power cycle or replace the sensor sma...

Page 54: ...Manual Rev B 2020 07 FO7 RH Temp Fault cGas cannot communicate with the sensor Ensure the smart board is installed correctly If unresolved contact our Technical Support Department F30 AO DAC is not r...

Page 55: ...2020 All rights reserved Data subject to change without notice 55 Rev B 2020 07 cGas Detector Analog Transmitter Operation Manual NOTES...

Page 56: ...t 145 7391 Vantage Way Delta BC V4G 1M3 Canada Tel 1 604 940 8741 Toll Free 1 877 940 8741 www critical environment com CGAS A 2020722 Rev B 2020 All rights reserved Data subject to change without not...

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