CET cGas Detector User manual

Rev. A | 2020.03
www.critical-environment.com
cGas Detector Digital Transmitter
Operation Manual

2© 2020 All rights reserved. Data subject to change without notice.
cGas Detector Digital Transmitter - Operation Manual Rev. A | 2020.03
NEED MORE INFORMATION?
This is the Operation Manual for the cGas Detector Digital Transmitter. If you
would like it in pdf form, please scan the QR code on the back cover page of this
booklet or you can download it from our website:
https://www.critical-environment.com/media/download/manuals/CGAS-D-
Operation-Manual.pdf
There is also an Installation Manual, which includes more information:
• Installation
• Special Considerations for Different Types of Sensors
• Mounting the Transmitter
• Wiring Connections
You can scan the QR code below or download the Installation Manual from our
website:
https://www.critical-environment.com/media/download/manuals/CGAS-D-
Installation-Manual.pdf

© 2020 All rights reserved. Data subject to change without notice. 3
Rev. A | 2020.03 cGas Detector Digital Transmitter - Operation Manual
TABLE OF CONTENTS
1 POLICIES .......................................................................................................6
1.1 Important Note....................................................................................... 6
1.2 Warranty Policy ...................................................................................... 7
1.3 Service Policy ......................................................................................... 8
1.4 Copyrights .............................................................................................. 9
1.5 Disclaimer............................................................................................... 9
1.6 Revisions ................................................................................................ 9
2 INTRODUCTION ...........................................................................................10
2.1 General Description.............................................................................. 10
2.2 Key Features......................................................................................... 11
3 INSTRUMENT SPECIFICATIONS..................................................................12
3.1 Technical Speci!cations...................................................................... 12
3.2 Enclosure Dimensions......................................................................... 16
4 SENSOR SPECIFICATIONS ..........................................................................17
4.1 Single Channel Gas Sensor Options ................................................... 17
4.2 Dual Channel Gas Sensor Options...................................................... 19
4.3 Calibration Extending Firmware (CEF) and Sensor Aging................. 20
5 INSTRUMENT FEATURES ............................................................................21
5.1 Exterior Enclosure................................................................................ 21
5.2 Interior System Layout......................................................................... 22
6 SYSTEM OPERATION & CONFIGURATION...................................................23
6.1 Navigating the Menu Structure ........................................................... 23
6.2 Accessing the Menu with Passcodes................................................. 23
6.3 Display Settings.................................................................................... 25
6.3.1 Adjust Display Brightness ............................................................. 25

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cGas Detector Digital Transmitter - Operation Manual Rev. A | 2020.03
6.3.2 Display Configurations................................................................... 26
6.3.3 Display or Hide Line 1 and/or 2.................................................... 27
6.4 Alarm Status, Fault Detection and Communication Failure Alerts ... 28
6.5 Enable / Disable Channels................................................................... 29
6.6 Setting Channel Alarm Setpoints, Direction and Hysteresis ............. 30
6.7 Relay Function (models with Option -RLY) ......................................... 34
6.8 Change Units (oC or oF) of Temperature Readings............................. 35
6.9 Temperature and/or Relative Humidity Offset ................................... 35
6.10 Test Functions.................................................................................... 37
6.10.1 Test Readings / Digital Output ................................................... 37
6.10.2 Test Relay (models with Option -RLY)....................................... 38
7 MODBUS® AND BACNET® CONFIGURATION.............................................39
7.1 Changing Digital Communication Type in the Field........................... 39
7.2 Con!guring Modbus® Settings........................................................... 40
7.2.1 Change Modbus® MAC Address................................................. 40
7.2.2 Change Modbus® Baud Rate....................................................... 41
7.2.3 Modbus® Holding Registers ........................................................ 42
7.3 Con!guring BACnet® Settings............................................................ 42
7.3.1 Change BACnet® MAC Address.................................................. 42
7.3.2 Change BACnet® Instance ID ...................................................... 43
7.3.3 Change BACnet® Baud Rate........................................................ 44
7.3.4 BACnet® PICS Information........................................................... 45
8 PLUG & PLAY SMART SENSOR REPLACEMENT..........................................45
8.1 How to Replace or Add a New Smart Sensor Board.......................... 46
8.2 Read from Sensor ................................................................................ 47
8.3 Write to Sensor..................................................................................... 48

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Rev. A | 2020.03 cGas Detector Digital Transmitter - Operation Manual
9 CALIBRATION ..............................................................................................49
9.1 Calibration Speci•cations.................................................................... 49
9.1.1 Gas..................................................................................................... 49
9.1.2 Regulators & Flow........................................................................... 50
9.1.3 Adapters ........................................................................................... 50
9.1.4 Calibration Frequency .................................................................... 50
9.1.5 Gas Testing Frequency (Bump Testing) ..................................... 51
9.1.6 Sticky Gases..................................................................................... 51
9.2 Calibrating the Internal Sensor(s)....................................................... 51
9.2.1 Set Calibration Gas Value.............................................................. 52
9.2.2 Zero (Null) Calibration .................................................................... 53
9.2.3 Span Calibration.............................................................................. 54
9.3 Troubleshooting Calibration................................................................ 56
9.3.1 Calibration Adapter Plug Doesn’t Fit ........................................... 56
9.3.2 Zero Fault.......................................................................................... 57
9.3.3 Span (Calibration) Fault ................................................................. 57
9.3.4 Zero Override ................................................................................... 57
9.3.5 Span Override .................................................................................. 58
9.4 Calibrating an Oxygen Sensor............................................................. 58
10 ACCESSORIES ...........................................................................................61
10.1 Splash Guard (Option -S)................................................................... 61
10.2 Calibration Adapter Clip ”Cal Clip” .................................................... 61
10.3 Splash Guard for Sticky Gases (Option -SN).................................... 62
10.4 Metal Protective Guard...................................................................... 62
10.5 Calibration Kit..................................................................................... 63
11 MAINTENANCE .........................................................................................64
12 TROUBLE SHOOTING.................................................................................64

6© 2020 All rights reserved. Data subject to change without notice.
cGas Detector Digital Transmitter - Operation Manual Rev. A | 2020.03
1 POLICIES
1.1 Important Note
Read and understand this manual prior to using this instrument. Carefully read
the warranty policy, service policy, notices, disclaimers and revisions on the
following pages.
This product must be installed by a 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:
______________________________________________________
PURCHASE DATE:
______________________________________________________
PURCHASED FROM:
______________________________________________________

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Rev. A | 2020.03 cGas Detector Digital Transmitter - Operation Manual
1.2 Warranty Policy
Critical Environment Technologies Canada Inc. (the manufacturer) warrants this
gas monitoring instrument, (excluding sensors, battery packs, batteries, pumps
and filters), to be free from defects in materials and workmanship for a period
of two years from the date of purchase from our facility. The sensors have a
warranty period of one year on a pro-rated basis from the date of purchase
from our facility. This warranty is limited to the mechanics of the physical
sensor components and as such, should the sensor become defective within
this warranty period, we will repair or replace it at our discretion. This warranty
does not extend to sensors that have been poisoned by external compounds
such as, but not limited to, extreme gas concentrations, paint fumes, excessive
dust, debris, etc. or to sensors that have been improperly zeroed, calibrated
or altered in any way. If it is determined within 90 days of purchase that a
sensor is malfunctioning or unable to remain calibrated due to no fault of its
placement or treatment, the instrument may be sent back to the factory for a
free calibration service.
The warranty status may be affected if the instrument has not been operated,
calibrated or maintained as per the instructions in the instrument’s Operation
Manual or if the instrument has been abused, damaged or altered in any way.
This instrument is only to be used for purposes stated herein. The manufacturer
is not liable for auxiliary interfaced equipment or consequential damage.
Due to ongoing research, development and product testing, the manufacturer
reserves the right to change specifications without notice. The information
contained herein is based on data considered accurate. However, no warranty is
expressed or implied regarding the accuracy of this data.
All returned goods (whether under warranty or not) must be pre-authorized
by obtaining a return merchandise authorization (RMA) number and shipped
back to the manufacturer by prepaid freight. Contact the manufacturer for an
RMA number and the procedures required for product transport.

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cGas Detector Digital Transmitter - Operation Manual Rev. A | 2020.03
1.3 Service Policy
CETCI maintains an instrument service facility at the factory. Some CETCI
distributors / agents may also have repair facilities; however, CETCI assumes
no liability for service performed by anyone other than CETCI personnel.
Repairs are warranted for 90 days after date of shipment (sensors have
individual warranties). Should your instrument require non-warranty repair, you
may contact the distributor from whom it was purchased or you may contact
CETCI directly.
Prior to shipping equipment to CETCI, contact our office for an RMA #. All
returned goods must be accompanied with an RMA number.
If CETCI is to do the repair work, you may send the instrument, prepaid, to:
Attention: Service Department
Critical Environment Technologies Canada Inc.
Unit 145, 7391 Vantage Way
Delta, BC, V4G 1M3
Always include your Returned Merchandise Authorization (RMA) number,
address, telephone number, contact name, shipping / billing information, and
a description of the defect as you perceive it. You will be contacted with a cost
estimate for expected repairs, prior to the performance of any service work.
For liability reasons, CETCI has a policy of performing all needed repairs to
restore the instrument to full operating condition.
Pack the equipment well (in its original packing if possible), as we cannot be
held responsible for any damage incurred during shipping to our facility.

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Rev. A | 2020.03 cGas Detector Digital Transmitter - Operation Manual
1.4 Copyrights
This manual is subject to 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
Under no circumstances will CETCI be liable for any claims, losses or damages
resulting from or arising out of the repair or modification of this equipment
by a party other than CETCI service technicians, or by operation or use of the
equipment other than in accordance with the printed instructions contained
within this manual or if the equipment has been improperly maintained or
subjected to neglect or accident. Any of the forgoing will void the warranty.
Under most local electrical codes, low voltage wires cannot be run within the
same conduit as line voltage wires. It is CETCI policy that all wiring of our
products meet this requirement.
It is CETCI policy that all wiring be within properly grounded (earth or safety)
conduit.
1.6 Revisions
This manual was written and published by CETCI. The manufacturer makes
no warranty or representation, expressed or implied including any warranty of
merchantability or fitness for purpose, with respect to this manual.

10 © 2020 All rights reserved. Data subject to change without notice.
cGas Detector Digital Transmitter - Operation Manual Rev. A | 2020.03
All information contained in this manual is believed to be true and accurate at
the time of printing. However, as part of its continuing 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 upgrading the device’s
firmware, please contact CETCI at the following address:
Critical Environment Technologies Canada Inc.
Unit 145, 7391 Vantage Way, Delta, BC, V4G 1M3, Canada
Toll Free: +1.877.940.8741
Telephone: [phone]
Fax: [phone]
Email: [email protected]
Website: www.critical-environment.com
In no event will CETCI, its officers or employees be liable for any direct, special,
incidental or consequential damages resulting from any defect in any manual,
even if advised of the possibility of such damages.
2 INTRODUCTION
2.1 General Description
Thank you for purchasing our cGas Detector Transmitter. The cGas Detector
is a one or two channel gas detection transmitter that offers flexible
customization options with the purpose of meeting your specific application
and budgetary requirements. Ideal for monitoring toxic, combustible and
refrigerant gases in non-hazardous (non-explosion rated) environments such
as enclosed parking facilities, commercial HVAC, greenhouses, recreational
facilities, refrigeration plants, manufacturing plants and other light industrial
applications.

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Rev. A | 2020.03 cGas Detector Digital Transmitter - Operation Manual
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
• User 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
• 4-conductor shielded network wiring (daisy-chain)
• In field upgradable firmware/configuration via USB connection
• Bright LCD display
• Option -RLY *: One SPDT dry contact relay, rated 30 volts, 2 amps max
• Option -LT*: Low temperature package for improved usability in cold
environments
• Option -RHT *: Relative Humidity and Temperature sensor
• Option -S: Splash guard, factory installed, IP54 rated enclosure
• Option -SN: Splash guard for sticky gas sensors, factory installed
• Standard water / dust tight, corrosion resistant enclosure (drip proof)
• Copper coated interior to reduce RF interference
• RoHS compliant circuit boards
• Auto resetting fuse
NOTE: * Option may be restricted to certain models and/or gas configurations.

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cGas Detector Digital Transmitter - Operation Manual Rev. A | 2020.03
Option -LT is a low temperature package with OLED display and internal heater
for cold environment applications down to -40°C / -40°F
• Available with all models except CGAS-D-EETO
Option -RHT is an RH & Temperature sensor (oC or oF)
• Available with all single channel configurations except sticky gas
sensors (Cl2, ClO2, HCI, HCN, O3, PH3)
• Available with dual channel configurations that have a CO sensor
• The UL2075 approved CO sensor is not available with RH and
Temperature sensor
Option -RLY is a 1 SPDT dry contact relay, rated 30 volts, 2 amps max
• Available with all single channel confi gurations except CO2and
sticky gas sensors (Cl2, ClO2, HCI, HCN, O3, PH3)
Options -RHT and -RLY are both available with CGAS-D-CO
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 Speci!cations
MECHANICAL
Enclosure
ABS / Polycarbonate, IP54 rating with splash guard
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

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Rev. A | 2020.03 cGas Detector Digital Transmitter - Operation Manual
Conduit Entry Points 12.7 mm / 1/2 in diameter
Mounting Holes
4.47 mm / 0.175 in diameter
maximum head diameter 8 mm / 0.32 in, #8 or 4
mm screw
USER INTERFACE
Display (standard) 2-line by 16 character graphic LCD, user configurable
to suppress reading display.
Display (Option -LT) Optional OLED display for improved usability in low
temperature applications, 2-line by 16 character
USB Port Internal port for USB memory stick connection for
field configuration/firmware upgrades
Push Buttons Initiate calibration and menu options with internal UP,
DOWN and ENTER push buttons
Audible Alarm none
ELECTRICAL
Power Requirement
16 - 30 VDC, 3 W, Class 2
12 - 27 VAC, 50-60 Hz, 3 VA, Class 2
24V recommended.
Digital Wiring
VDC or VAC (ground referenced) four-conductor
shielded 16 AWG stranded within conduit, network
wiring (daisy-chain)
Fuses Automatic resetting thermal

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cGas Detector Digital Transmitter - Operation Manual Rev. A | 2020.03
INPUT/OUTPUT
Communication
Modbus® RTU
(version 1.1b3)
RS-485
Modbus® ID: 100 (default, configurable)
Baud rate: 19,200 (default, configurable)
Data bits: 8
Start bits: 1
Stop bits: 1
Parity: none
Communication
BACnet® MS/TP
(version 1 rev 14)
RS-485
BACnet® MS/TP; ANSI/ASHRAE standard 135
BACnet®
Communication protocol: 135-2012
Baud Rate: 76,800 (default)
Base Address: 270 (default)
MAC Address: 100 (default)
Parity: no parity
Stop bits: 1
Data bits: 8
Relay (Option - RLY)
One SPDT dry contact relay
rated 30 volts, 2 amps max
(not available with CO2gas configurations)
RH and Temperature
(Option -RHT) Available with CO2 and CO gas configurations only
ENVIRONMENTAL
Operating
Temperature
0°C to 40°C / 32°F to 104°F (standard)
-40°C to 40°C / -40°F to 104°F (with Option -LT)
Operating Humidity 15 - 90% RH non-condensing

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Rev. A | 2020.03 cGas Detector Digital Transmitter - Operation Manual
Pollution Degree Degree 2
Altitude below 2,000 m
CERTIFICATION
Model: CGAS-D-XXX
S/N: CGASD1807B00010
Rating: 16-30 VDC, 3W, Class 2
12-27 VAC, 50-60 Hz, 3VA, Class 2
CERTIFIED FOR ELECTRIC SHOCK & ELECTRICAL 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 harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.

16 © 2020 All rights reserved. Data subject to change without notice.
cGas Detector Digital Transmitter - Operation Manual Rev. A | 2020.03
3.2 Enclosure Dimensions
Above dimensions are shown with optional splash guard. Without splash guard,
thickness is 71 mm / 2.8 in. The area required for enclosure door to be open 90
degrees is 178 mm / 7.0 in or 254 mm / 10.0 in for fully open. With the optional
splash guard installed, the enclosure is IP54 rated.

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4 SENSOR SPECIFICATIONS
4.1 Single Channel Gas Sensor Options
Electrochemical Sensors Part Number Range Lifespan
Ammonia (NH3) CGAS-D-NH3 0 - 500 ppm ~2 yrs
Carbon Monoxide (CO) CGAS-D-CO 10 - 200 ppm ~6 yrs
Chlorine (Cl2) CGAS-D-CL2 0 - 5.0 ppm ~3 yrs
Chlorine Dioxide (ClO2) CGAS-D-CLO2 0 - 1 ppm ~2 yrs
Ethylene (C2H4) CGAS-D-C2H4 0 - 200 ppm ~2 yrs
Ethylene Oxide (C2H4O) CGAS-D-EETO 0 - 20 ppm ~2 yrs
Fluorine (F2) CGAS-D-F2 0 - 1 ppm ~2 yrs
Formaldehyde (CH2O) CGAS-D-CH2O 0 - 5 ppm ~2 yrs
Hydrogen (H2) CGAS-D-EH2 0 - 2,000 ppm ~2 yrs
Hydrogen Sulphide (H2S) CGAS-D-H2S 0 - 50 ppm ~2 yrs
Hydrogen Chloride (HCl) CGAS-D-HCL 0 - 30 ppm ~2 yrs
Hydrogen Cyanide (HCN) CGAS-D-HCN 0 - 30 ppm ~2 yrs
Hydrogen Fluoride (HF) CGAS-D-HF 0 - 10 ppm ~2 yrs
Nitric Oxide (NO) CGAS-D-NO 0 - 100 ppm ~2 yrs
Nitrogen Dioxide (NO2) CGAS-D-NO2 0 - 10 ppm ~6 yrs
Oxygen (O2) CGAS-D-O2 0 - 25% Vol ~3 yrs
Ozone (O3) CGAS-D-O3 0 - 2 ppm ~2 yrs

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cGas Detector Digital Transmitter - Operation Manual Rev. A | 2020.03
Phosphine (PH3) CGAS-D-PH3 0 - 5 ppm ~2 yrs
Silane (SiH4) CGAS-D-SIH4 0 - 20 ppm ~2 yrs
Sulphur Dioxide (SO2) CGAS-D-SO2 0 - 20 ppm ~2 yrs
Refrigerant Sensors Part Numbers Range Lifespan
Refrigerant R22 CGAS-D-SR22 0 - 2,000 ppm ~5 yrs
Refrigerant R134A CGAS-D-SR134A 0 - 2,000 ppm ~5 yrs
Refrigerant R402A CGAS-D-SR402A 0 - 2,000 ppm ~5 yrs
Refrigerant R404A CGAS-D-SR404A 0 - 2,000 ppm ~5 yrs
Refrigerant R407A CGAS-D-SR407C 0 - 2,000 ppm ~5 yrs
Refrigerant R410A CGAS-D-SR410A 0 - 2,000 ppm ~5 yrs
Refrigerant R422D CGAS-D-SR422D 0 - 2,000 ppm ~5 yrs
Refrigerant R438A CGAS-D-SR438A 0 - 2,000 ppm ~5 yrs
Refrigerant R507A CGAS-D-SR507A 0 - 2,000 ppm ~5 yrs
TVOCs CGAS-D-STVOC 0 - 500 ppm ~5 yrs
Catalytic Sensors Part Number Range Lifespan
Hydrogen (H2) CGAS-D-CH2-100 0 - 100% LEL ~5 yrs
Methane (CH4) CGAS-D-CH4-100 0 - 100% LEL ~5 yrs
Propane (C3H8)CGAS-D-
CC3H8-100 0 - 100% LEL ~5 yrs

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Rev. A | 2020.03 cGas Detector Digital Transmitter - Operation Manual
PID Sensors Part Number Range
TVOC CGAS-D-SPL 0 - 30 ppm usage /
application
dependent
TVOC CGAS-D-SPH 0 - 300 ppm
Infrared Sensors Part Numbers Range Lifespan
Carbon Dioxide (CO2)CGAS-D-CO2-5K 0 - 5,000 ppm ~8 yrs
CGAS-D-CO2-5% 0 - 5% vol
4.2 Dual Channel Gas Sensor Options
Two Internal
Electrochemical
Sensors
Part Number Range Lifespan
Carbon Monoxide
(CO) and Nitrogen
Dioxide (NO2)
CGAS-D-CO-NO2 10 - 200 ppm
0 - 10 ppm ~6 yrs
Carbon Monoxide
(CO) and
Ethylene (C2H4)
CGAS-D-CO-C2H4 10 - 200 ppm ~6 yrs
~2 yrs
Carbon Monoxide
(CO) and
Hydrogen Sulphide
(H2S)
CGAS-D-CO-H2S 10 - 200 ppm
0 - 50 ppm
~6 yrs
~2 yrs

20 © 2020 All rights reserved. Data subject to change without notice.
cGas Detector Digital Transmitter - Operation Manual Rev. A | 2020.03
Carbon Monoxide
(CO) and
Oxygen (O2)
CGAS-D-CO-O2 10 - 200 ppm
0 - 25% vol
~6 yrs
~3 yrs
Carbon Monoxide
(CO) and Nitric Oxide
(NO)
CGAS-D-CO-NO 10 - 200 ppm
0 - 100 ppm ~3 yrs
Hydrogen Sulphide
(H2S) and
Sulphur Dioxide (SO2)
CGAS-D-H2S-SO2 0 - 50 ppm
0 - 20 ppm ~2 yrs
1 Carbon Monoxide sensor UL2075 Approved
NOTE: Carbon Monoxide detectors that are ordered with Option -RHT can not
use UL2075 approved CO sensor
4.3 Calibration Extending Firmware (CEF) and Sensor Aging
The cGas Detector with integral electrochemical sensor(s) have been
programmed with our CEF. This firmware takes into consideration the aging of
the electrochemical CO and NO2 sensors so that less frequent calibrations are
required in less-critical applications such as parking garages. The system tracks
the age of the sensor and automatically compensates for the reduced output of
the sensor as it ages.