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

11

Rev. A | 2020.11

cGas Detector for Indoor Public Spaces - Installation Manual

sensor or a remote refrigerant sensor (dongle). The internal sensor model is

ideal for mounting ﬂ ush with the wall. The remote refrigerant sensor model
has a 9m / 29.5 ft dongle cable that is ideal for use in packaged terminal air
conditioner (PTAC) applications.

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

• 1 or 2 gas channel operation (depends on model)
• Internal PM2.5 particulate sensor available
• One 4-20 mA analog output, or ﬁ eld conﬁ gurable Modbus® RS-485 RTU

or BACnet® MS/TP communication protocols for communication with a
Controller or Building Automation System (BAS)

• Easy Plug & Play Smart sensor replacement at end of life
• Customizable sensor and option combinations to meet speciﬁ c

application requirements

• 24 volt DC or (ground referenced) AC power
• In ﬁ eld upgradable ﬁ rmware/conﬁ guration via USB connection
• Bright LCD display
• Option -RLY*: One SPDT dry contact, rated 30 volts, 2 amps max
• Option -RHT *: Relative Humidity and Temperature sensor
• Low proﬁ le to reduce noticeability in public spaces
• RoHS compliant circuit boards
• Auto resetting fuse

NOTE:

*Option may be restricted to certain models and/or gas conﬁ gurations.

Analog models have one analog output. Factory default analog output is the
gas reading.

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Summary of Contents for CGAS-AP

Page 1: ...Rev A 2020 11 www critical environment com cGas Detector Indoor Public Spaces Installation Manual ...

Page 2: ...d viewed on our website https www critical environment com media download manuals CGAS AP and CGAS DP Operation Manual pdf Or scan the QR code below to open the pdf version of the manual The Operation Manual includes Adjusting Display Settings Alarm Status Fault Detection and Communication Failure Notiﬁcations Setting Channel Alarm Setpoints Direction and Hysteresis Relay Operation Enable Disable ...

Page 3: ...ion 10 2 2 Key Features 11 3 INSTRUMENT SPECIFICATIONS 12 3 1 Technical Speciﬁcations 12 3 2 Enclosure Dimensions 16 4 SENSOR SPECIFICATIONS 16 4 1 Analog Single Channel Gas Sensors 16 4 2 Digital Single Channel Gas Sensors 17 4 3 Digital Dual Channel Gas Sensors 18 4 4 RH Temperature Sensor Option RHT 19 5 INSTRUMENT FEATURES 20 5 1 Exterior Enclosure 20 5 2 Analog Interior System Layout 21 5 3 D...

Page 4: ...iring Connections 33 6 5 4 Digital Wire Gauge vs Run Length 35 6 5 5 Wiring Remote Dongle Sensor to the Smart Board 36 6 5 6 Wiring the Relay Smart Board Option RLY 37 7 BASIC SYSTEM OPERATION 38 7 1 Power up and Warm up Process from Factory 38 7 2 Navigating the Menu Structure 39 7 3 Accessing the Menu with Passcodes 39 7 4 Change Units o C or o F of Temperature Readings 41 7 5 Temperature and or...

Page 5: ...tor for Indoor Public Spaces Installation Manual 8 2 3 Modbus Holding Registers 50 8 3 Conﬁguring BACnet Settings 50 8 3 1 Change BACnet MAC Address 50 8 3 2 Change BACnet Instance ID 51 8 3 3 Change BACnet Baud Rate 52 8 3 4 BACnet PICS Information 52 9 MAINTENANCE 53 10 TROUBLE SHOOTING 54 ...

Page 6: ... qualiﬁed 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 This instrument has not been designed to be intrinsically safe For your safety do not use it in classiﬁed hazardous areas explosion rated environments INSTRUMENT SERIAL NUMBER ___________________...

Page 7: ...ed damaged or modiﬁed in any way The product 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 CETCI contact our oﬃce for an RMA All returned goods regardless of reason must be accompanied with an RMA number Please read our Warranty and Returns Policy and...

Page 8: ...copyright protection all rights are reserved Under international and domestic copyright 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 BACnet is a registered trademark of American Society of Heating Refrigeration and Air Conditioning ASHRAE 1 5 Disclaimer ...

Page 9: ...ontinuing efforts to improve its products and their documentation 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 version of the product the user has Should you detect any error or omission in this manual or should you want to inquire regarding upgr...

Page 10: ...sthetically pleasing enclosure is designed to reduce the noticeability of the device by the public eye It is secured by a mounting plate that can be mounted proud of the wall or ﬂush with the wall using a junction box Both the analog and digital models are powered by 24 VDC or ground referenced AC come with an LCD display temperature compensation and thermal resetting fuse Sensor replacement is ea...

Page 11: ... PM2 5 particulate sensor available One 4 20 mA analog output or ﬁeld conﬁgurable Modbus RS 485 RTU or BACnet MS TP communication protocols for communication with a Controller or Building Automation System BAS Easy Plug Play Smart sensor replacement at end of life Customizable sensor and option combinations to meet speciﬁc application requirements 24 volt DC or ground referenced AC power In ﬁeld u...

Page 12: ... channel conﬁ gurations Options RHT and RLY both together are available with CO and CO2 conﬁgurations only If after reading through the manual you have any questions please do not hesitate to contact our service department for technical support 3 INSTRUMENT SPECIFICATIONS 3 1 Technical Speciﬁcations MECHANICAL Enclosure White ABS Polycarbonate low proﬁle with mounting plate Weight 400 g 14 oz Size...

Page 13: ... 16 30 VDC 3 W Class 2 12 27 VAC 50 60 Hz 3 VA Class 2 24V recommended Refer to Section 6 5 Wiring Connections Digital Wiring VDC or VAC ground referenced four conductor shielded 16 AWG stranded within conduit network wiring daisy chain Analog Wiring VAC ground referenced three conductor shielded 18 AWG or larger stranded Fuses Automatic resetting thermal INPUT OUTPUT Digital Output CGAS DP models...

Page 14: ...ocol 135 2012 Baud Rate 76 800 default conﬁgurable Base Address 270 default conﬁgurable MAC Address 100 default conﬁgurable Parity no parity default conﬁgurable Stop bits 1 Data bits 8 Analog Output CGAS AP models One linear 4 20 mA output Relay Option RLY One SPDT dry contact rated 30 volts 2 amps max RH and Temperature Option RHT Available with CO or CO2 gas conﬁgurations User selectable units S...

Page 15: ...L FIRE HAZARD ONLY LA CERTIFICATION 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 2015 Type 1 EN61010 Conforms to FCC This device complies with part 15 of the FCC Rules Operation is subject to the following two conditions 1 This device may not cause harmfu...

Page 16: ...e Dimensions 4 SENSOR SPECIFICATIONS 4 1 Analog Single Channel Sensors PART NUMBER SENSOR RANGE LIFESPAN CGAS AP CO2 5K Infrared Carbon Dioxide CO2 0 5 000 ppm 8 years CGAS AP CO2 5 Infrared Carbon Dioxide CO2 0 5 vol 8 years CGAS AP CO Electrochemical Carbon Monoxide CO 0 200 ppm 6 years CGAS AP CH2O Electrochemical Formaldehyde CH2 O 0 5 ppm 2 years ...

Page 17: ...rnal 0 2 000 ppm 5 years CGAS AP RD ESH B SR410A Solid State R410A Refrigerant remote dongle 0 2 000 ppm 5 years CGAS AP RD ESH B SR507A Solid State R410A Refrigerant remote dongle 0 2 000 ppm 5 years CGAS AP STVOC Solid State TVOC sensor 0 500 ppm 5 years 4 2 Digital Single Channel Sensors PART NUMBER SENSOR RANGE LIFESPAN CGAS DP CO2 5K Infrared Carbon Dioxide CO2 0 5 000 ppm 8 years CGAS DP CO2...

Page 18: ...erant remote dongle 0 2 000 ppm 5 years CGAS DP RD ESH B SR507A Solid State R410A Refrigerant remote dongle 0 2 000 ppm 5 years CGAS DP STVOC Solid State TVOC sensor 0 500 ppm 5 years Other Refrigerants may be available upon request 4 3 Digital Dual Channel Sensors PART NUMBER SENSOR RANGE LIFESPAN CGAS DP CO CO2 5K Electrochemical Carbon Monoxide CO and Infrared Carbon Dioxide CO2 0 200 ppm 0 5 0...

Page 19: ...RH Temperature Sensor Option RHT For analog CGAS AP models with an internal gas sensor and the optional RH Temperature sensor the analog output default is the gas reading Because the CGAS AP is a single channel device it has only one analog output the RH and temperature readings are for display purposes only there is no current output or signal back to a controller or BAS DDC for RH or temperature...

Page 20: ...tion Manual Rev A 2020 11 5 INSTRUMENT FEATURES 5 1 Exterior Enclosure NUMBER FEATURE FUNCTION Œ Display LCD Display Sensor Vents Allows gas diffusion into sensor Ž Remote Dongle ie ESH B SR410A Remote refrigerant sensor for hotel applications for CGAS AP RD and CGAS DP RD models only closure FEATURE FUNCTION Œ Ž ...

Page 21: ...ta subject to change without notice 21 Rev A 2020 11 cGas Detector for Indoor Public Spaces Installation Manual 5 2 Analog Interior System Layout Back Side of Circuit Board removed from enclosure Front Side of Circuit Board Œ Œ Ž ...

Page 22: ... board with display and smart boards attached 3 Programming Buttons Access menu options and program functions using buttons inside the enclosure at the side of circuit board Arrow up Enter Arrow down LCD Display Indicates transmitter operations Sockets for sensors and Options boards Smart sensor boards and Options boards plug into the main board using these sockets Particulate Sensor Mount Holds t...

Page 23: ... subject to change without notice 23 Rev A 2020 11 cGas Detector for Indoor Public Spaces Installation Manual 5 3 Digital Interior System Layout Front Side of Circuit Board Œ Œ Ž Back Side of Circuit Board removed from enclosure 11 ...

Page 24: ...ircuit board with display and smart boards attached 3 Programming Buttons Access menu options and program functions using buttons inside the enclosure at the side of circuit board Arrow up Enter Arrow down LCD Display Indicates transmitter operations Sockets for sensors and Options boards Smart sensor boards and Options boards plug into the main board using these sockets Particulate Sensor Harness...

Page 25: ... considering the gas readings to be accurate NOTE All sensors are calibrated in the factory and should not require calibration at the time of a routine installation or replacement NOTE Temperature affects calibration It is important to ensure the gas is at the appropriate temperature during calibration If the sensor is being used in an extreme temperature range calibration should be done in that s...

Page 26: ...l Risks Disconnect all power before servicing There may be multiple power sources Power supply may have a building installed circuit breaker switch that is suitably located and easy to access when servicing is required and should be labelled as cGas Detector supply disconnecting power to the cGas Detector Appropriate markings should be visible at the circuit breaker switch that is supplying power ...

Page 27: ...cts of these interferences and we meet CSA FCC and CE requirements for these type of devices However there are still circumstances and levels of interference that may cause our equipment to respond to these interferences and cause them to react as if there has been gas detected There are some installation procedures that will reduce the likelihood of getting faulty readings 1 Locate the detectors ...

Page 28: ...rom the ﬂoor where most human breathing takes place This is a good default location for sensors as many gases are often well dispersed in air Both Carbon monoxide and Carbon dioxide have a molecular weight close to that of air and should be installed in the breathing zone For monitoring refrigerant gas with the remote dongle sensor place the sensor as close to the potential leak area as possible T...

Page 29: ...re Base Œ Œ Ž NUMBER FEATURE Œ Holes for the screws to hold hinges together secured from the back of the enclosure Entry Point 6 x 2 cm 2 35 x 0 8 in Ž Two extra screws just in case you need them Screw used to secure circuit board in place Slide circuit board harness into the slots see and tighten this singular screw loosen to remove circuit board Mounting Key Holes 9 5 cm 3 75 in apart ...

Page 30: ... powered device Any application of operating voltages higher than indicated in the speciﬁcation may result in damage Double check wiring connections prior to powering the transmitter Damage from incorrect wiring connections or from too much voltage applied is not covered under warranty 6 5 1 Analog Wiring Connections Signal output and supply should be in shielded cable The cable shield should be c...

Page 31: ...ing 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 VDC or 12 VAC NOTE WARRANTY VOID IF SOLID CORE WIRE IS USED AT THE WIRING TERMINAL STRIP When using solid core wiring for distribution in the conduit use stranded wire pigtails 18 ...

Page 32: ...or each cGas Detector is required SUPPLY VOLTAGE MAXIMUM LOAD Wire Termination Resistor ohms WIRE GAUGE awg MAXIMUM CABLE LENGTH feet 24 VDC 592 20 4 400 18 7 100 16 10 700 16 VDC 216 assume a 200 Ω termination resistor 20 700 18 1 200 16 1 800 24 VAC 1 060 20 27 000 18 43 200 16 65 500 12 VAC 316 assume a 200 Ω termination resistor 20 5 600 18 8 900 16 13 583 NOTE The termination resistor could b...

Page 33: ...l network to the other through the same connections along the entire run From one digital device to the next digital device A goes to A B goes to B GND goes to GND 24V goes to 24V Do not mix up the individual wires or the two groups of four wires An end of line jumper must be installed at both ends of the digital network To terminate you must enable the 120 ohm resistor on the IN or sometimes labe...

Page 34: ...ing connected to a BAS DDC or other control panel then either a 24 VDC power supply or 24 VAC Class 2 or better transformer needs to be used Wiring Example 4 Wire VDC If the cGas Detector is being connected to 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 ...

Page 35: ...timum performance along the entire wire run Large wire sizes will have less voltage drop than smaller wires sizes of the same length Similarly shorter wire lengths will have less voltage drop than longer wires for the same wire size The longer the wire run the more attention there should be made to preventing voltage drop The addition of an RPS 24VDC Remote Power Supply may be required CETCI highl...

Page 36: ...large system applications if the recommended maximum cable length needs to be exceeded an LNK XT Network Extender can be used to boost the waning signal strength One LNK XT extends the network length by an additional 610 m 2 000 ft It is recommended that an LNK XT be installed approximately every 32 connected devices or when a drop in signal strength is detected 6 5 5 Wiring the Remote Dongle Refr...

Page 37: ...er from the relay terminal A dry contact relay operate like a switch to simply activate switch on or de activate switch off equipment to be controlled such as fan starters The cGas Detector is designed to be fail safe any equipment to be controlled by the system relays should be wired to the NC Normally closed and COM Common terminals With this wiring the connection will be open under normal low g...

Page 38: ...n on and rotate through several info screens that differ depending on the conﬁguration of the transmitter number of channels used type of communication etc The warm up period takes between 2 and 5 minutes depending on the gas sensor type NOTE The cGas Detector will be visible on the controller BAS DDC system during the warm up countdown but a correct reading will not show up until the unit has ﬁni...

Page 39: ...dicates 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 to change the value in that space The symbol indicates that you can edit the menu line item After entering and conﬁrming a value you can either Exit the menu or press the UP button to move to the next item in that menu All menus are circular and wi...

Page 40: ...Test Relay 1001d Basic Menu If conﬁgure as a Modbus device Comm Type Comm Mac Comm Baud Modbus Parity If conﬁgured as a BACnet device Comm Type Comm Mac Comm Baud Instance ID Comm Parity 1014 Display Menu Display Type Brightness Selected Channel Hide Channel Scroll Delay 2012 Alarms Menu Selected Channel Selected Alarm Level Set Alarm Setpoint Set Alarm Direction Ascending Descending Set Alarm Hys...

Page 41: ... Output a Set Analog Output Zero a Set Analog Output Range a Temperature Offset Humidity Offset Temperature Units 7 4 Change Units o C or o F Temperature Readings NOTE This menu item only applies if the cGas Detector has the RHT option installed You can change the factory conﬁgured temperature unit type from Celsius to Fahrenheit or vice versa very easily IMPORTANT Analog models have one analog ou...

Page 42: ...pe press ENTER Temperature Unit Celsius Press the UP button to choose Fahrenheit press ENTER and ENTER to exit Temperature Unit Fahrenheit 7 5 Temperature and or Relative Humidity Offset NOTE This menu item only applies if the cGas Detector has the RHT option installed Depending on the conﬁguration the device will show the temperature in either Celsius or Fahrenheit The units can be changed at any...

Page 43: ...ss ENTER and use the UP button to scroll to ﬁnd the item you are looking for Press ENTER Selected Channel CO Selected Channel Temperature Selected Channel Humidity Use the UP button to ﬁnd Temperature Adj or Humidity Adj If you want to change the offset value press ENTER Change the offset value using the UP or DOWN and ENTER buttons Temperature Adj 4 0 degC Humidity Adj 02 RH Press ENTER to conﬁrm...

Page 44: ...m 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 the default entry is 4 mA Press ENTER Test AO 4 0 mA Enter the preferred output value between 0 and 30 mA by using the UP DOWN and ENTER buttons or to continue with 4 mA press ENTER to the end Test AO 14 0 mA When ...

Page 45: ... 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 Selected Channel menu conﬁrm the correct channel is showing Selected Channel CO If you want to choose a different channel press ENTER and use the UP button to scroll to the next value Press ENTER and continue Selected Channel NO2 The lis...

Page 46: ... is not caused by activating fans or equipment or inadvertantly calling the ﬁre department or other emergency response team 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 Relay menu the default entry is Untripped Press ENTER and use the UP button to change to Trippe...

Page 47: ...n and ENTER button From the main display press ENTER Enter passcode 1001 using the UP button and ENTER button Enter Password 1001 Press ENTER to access the Basic Menu Basic Menu Press Enter Comm Type MODBUS Press ENTER Use the UP or DOWN buttons to choose MODBUS or BACNET or Cancel Press ENTER If you have changed the communication type the device will display Reset Device Comm Type BACNET Reset De...

Page 48: ...adding the transmitters to an existing system in the ﬁeld the factory default Modbus settings may require changes in order for communication to be successful between the devices on your network Make sure your network connection is complete the network termination switches are set appropriately and all the devices are conﬁgured with the same baud rate character format etc Each device must have its ...

Page 49: ...digit by pressing ENTER When ﬁnished press ENTER to conﬁrm and again to Exit Comm MAC 101 Confirm 101 N Y 8 2 2 Change Modbus Baud Rate All devices on the same network must have the same baud rate The default Modbus baud rate for all CETCI Modbus devices is 19 200 From the main display press ENTER Enter passcode 1001 using the UP button and ENTER button Enter Password 1001 Press ENTER to access th...

Page 50: ...CI for assistance 8 3 Conﬁguring BACnet Settings The cGas Detector CGAS DP can be conﬁgured with BACnet output to communicate with a BAS DDC or similar control panel 8 3 1 Change BACnet MAC Address The factory set default BACnet MAC address is 100 The MAC ID along with the Instance ID make up the complete ID for the device Each device requires a unique ID in order to communicate with the BAS DDC A...

Page 51: ...network must have a unique Instance ID An Instance ID is the Vendor ID or Base ID followed by the device s MAC address CETCI s Vendor ID is 270 If the device s MAC ID is 100 then the Instance ID would be 270100 From the main display press ENTER Enter passcode 1001 using the UP button and ENTER button Enter Password 1001 Press ENTER to access the Basic Menu Basic Menu Press Enter The Comm Type shou...

Page 52: ...e Basic Menu Basic Menu Press Enter The Comm Type should be BACnet Press the UP button until you see Comm Baud Comm Type BACnet Comm Baud 76 800 Press ENTER Using the UP or DOWN buttons scroll through the baud rates to choose from 9 600 14 400 19 200 38 400 57 600 76 800 default conﬁgurable 115 200 Select the preferred baud rate by pressing ENTER to save 8 3 4 BACnet PICS Information Critical Envi...

Page 53: ...rtually 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 vents should be kept free of dirt or soot build up If in a damp location source of water should be shielded from entering the enclosure If located in a working area the front of the transmitter s...

Page 54: ...es that are interfering with the sensor seeing the zero air Display shows SPAN FAULT message Check all connections and possible interferences and try a complete calibration procedure from the beginning again to see if this corrects the fault If a second calibration does not resolve the fault then the sensor needs to be replaced cGas Detector display shows COMM message Modbus or BACnet output signa...

Page 55: ...ng the equipment to react this way Refer to Section 6 3 2 EMI and RF Interference Considerations for more information When calibrating a CO2 sensor Calibrate Zero keeps failing or the Calibrate Span passes but the gas level reading keeps climbing Start the calibration process over Flow the nitrogen gas for 2 minutes before entering the Calibrate Zero menu Then ﬂow the span gas for 2 minutes before...

Page 56: ...nsor board gainPOT chip has failed If a power cycle does not resolve this replace the sensor smart board F05 Error in reading Smart Board cGas detected an error in the smart board ID Use Write to Sensor for the indicated channel passcode 3022 F06 SB ID Mismatch Firmware expected a different smart board than what is in the sensor socket F20 RLY GPIO chip is not responding Check to make sure the rel...

Page 57: ... 2020 All rights reserved Data subject to change without notice 57 Rev A 2020 11 cGas Detector for Indoor Public Spaces Installation Manual NOTES ...

Page 58: ...58 2020 All rights reserved Data subject to change without notice cGas Detector for Indoor Public Spaces Installation Manual Rev A 2020 11 NOTES ...

Page 59: ... 2020 All rights reserved Data subject to change without notice 59 Rev A 2020 11 cGas Detector for Indoor Public Spaces Installation Manual NOTES ...

Page 60: ...91 Vantage Way Delta BC V4G 1M3 Canada Tel 1 604 940 8741 Toll Free 1 877 940 8741 www critical environment com CGAS AP DP 20201119 Rev A Installation 2020 All rights reserved Data subject to change without notice ...

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