Critical Environment Technologies cGas Detector User manual
Rev. C | D | 2023.07
www.critical-environment.com
cGas Detector Indoor Public Spaces
Analog Transmitter | Digital Transmitter
Installation Manual
2 © 2023 All rights reserved. Data subject to change without notice.
cGas Detector for Indoor Public Spaces - Installation Manual Rev. C/D | 2023.07
NEED MORE INFORMATION?
This is the Installation Manual for the cGas Detector models CGAS-AP Analog
Transmitter and CGAS-DP Digital Transmitter for indoor public spaces. If you
would like to make sure you have the most current version or want to save it in
pdf form, click here to view or download from our website.
If you need more information, refer to the cGas Detector Public Spaces
Operation Manual, which covers topics such as:
• Relay Operation
• Alarm Status, Fault Detection and Communication Failure
• Setting Channel Alarm Setpoints, Direction and Hysteresis
• Enable/Disable Internal Buzzer
• Enable/Disable Alarm Blink
• Enable/Disable Channels
• Delete Channels
• Replacing Plug & Play Smart Sensors
• Calibration
• Accessories
• Maintenance
• Troubleshooting
If you would like to view or download the cGas Detector Public Spaces
Operation Manual from our website click here
The most up-to-date version of the manual will always be on our website.
© 2023 All rights reserved. Data subject to change without notice. 3
Rev. C/D | 2023.07 cGas Detector for Indoor Public Spaces - Installation Manual
TABLE OF CONTENTS
1 POLICIES .......................................................................................................5
1.1 Important Note....................................................................................... 5
1.2 Warranty Policy ...................................................................................... 6
1.3 Service Policy ......................................................................................... 6
1.4 Copyrights .............................................................................................. 7
1.5 Disclaimer............................................................................................... 7
1.6 Revisions ................................................................................................ 8
2 INTRODUCTION .............................................................................................9
2.1 General Description................................................................................ 9
2.2 Key Features......................................................................................... 10
3 INSTRUMENT SPECIFICATIONS..................................................................12
3.1 Technical Specications...................................................................... 12
3.2 Enclosure Dimensions......................................................................... 16
4 SENSOR SPECIFICATIONS ..........................................................................16
4.1 CGAS-AP Analog - Single Channel Gas Sensors................................ 16
4.2 CGAS-DP Digital - Single Channel Gas Sensors................................. 18
4.3 CGAS-DP Digital - Dual Channel Gas Sensors.................................... 19
4.4 RH & Temperature Sensor (Option -RHT) ........................................... 20
5 INSTRUMENT FEATURES ............................................................................21
5.1 Front Exterior Enclosure ...................................................................... 21
5.2 Enclosure with Front Cover Removed................................................. 22
5.3 Enclosure Bottom................................................................................. 23
5.4 CGAS-AP Analog - Interior System Layout ......................................... 24
5.5 CGAS-DP Digital - Interior System Layout .......................................... 25
6 INSTALLATION ............................................................................................26
6.1 General Safety and Maintenance Warnings ....................................... 26
4 © 2023 All rights reserved. Data subject to change without notice.
cGas Detector for Indoor Public Spaces - Installation Manual Rev. C/D | 2023.07
6.2 Protection Against Electrical Risks..................................................... 27
6.3 Mounting the Transmitter.................................................................... 28
6.3.1 Wet Environment Considerations ................................................ 28
6.3.2 EMI and RF Interference Considerations ................................... 28
6.3.3 Mounting Height (Sensor Dependent) ........................................ 29
6.4 Enclosure Mounting Components ...................................................... 30
6.5 Wiring Connections.............................................................................. 31
6.5.1 CAGS-AP Analog Wiring Connections ........................................ 31
6.5.2 CGAS-AP Analog Wire Gauge vs Run Length............................ 32
6.5.3 CGAS-DP Digital Wire Wiring Connections ................................ 33
6.5.4 CGAS-DP Digital Wire Gauge vs Run Length............................. 36
6.5.5 Wiring Remote (Dongle) Sensor to the Smart Board............... 37
6.5.6 Wiring the Relay (if installed) ........................................................ 38
6.6 Power Draw Requirements.................................................................. 39
7 BASIC SYSTEM OPERATION .......................................................................40
7.1 Power-up and Warm-up Process from Factory.................................. 40
7.2 Navigating the Menu Structure ........................................................... 41
7.3 Accessing the Menu with Passcodes................................................. 41
7.4 Display Settings.................................................................................... 42
7.4.1 Adjusting Display Brightness........................................................ 43
................................................................... 43
7.5 Alarm Status, Fault Detection and Communication Failure Alerts ... 44
7.6 Change CGAS-AP Analog Output (Milliamps - Voltage).................... 44
7.6.1 Set the CGAS-AP Analog Output Type ........................................ 45
7.6.2 Set CGAS-AP Analog Output Range............................................ 45
7.7 Change Units (oC or oF) of Temperature Readings............................. 46
7.8 Temperature and/or Relative Humidity Offset ................................... 47
7.9 Test Functions...................................................................................... 48
7.9.1 Test CGAS-AP Analog Output....................................................... 48
7.9.2 Test CGAS-DP Digital Output........................................................ 49
7.9.3 Test Relay and Buzzer (if installed) ............................................. 50
© 2023 All rights reserved. Data subject to change without notice. 5
Rev. C/D | 2023.07 cGas Detector for Indoor Public Spaces - Installation Manual
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.
technician and according to instructions indicated in this manual. This
trained technician.
This instrument has not been designed to be intrinsically safe. For your safety,
do not
INSTRUMENT SERIAL NUMBER:
______________________________________________________
PURCHASE DATE:
______________________________________________________
PURCHASED FROM:
______________________________________________________
8 TROUBLE SHOOTING...................................................................................51
6 © 2023 All rights reserved. Data subject to change without notice.
cGas Detector for Indoor Public Spaces - Installation Manual Rev. C/D | 2023.07
1.2 Warranty Policy
Critical Environment Technologies Canada Inc. warrants the products we
to be free from defects in materials and workmanship for a period of two years
from the date of purchase from our facility. Sensors are consumable items and
once they leave our factory, we cannot reuse or resell them. As such, all sensor
warranty that would apply from the date of purchase from our facility.
The warranty status may be affected if the instrument has not been used and
maintained as per the instructions in the manual or has been abused, damaged,
interfaced equipment or consequential damage.
returned goods, regardless of reason, must be accompanied with an RMA
number. Please read our Warranty and Returns Policy and follow our RMA
Instructions and Form.
Due to ongoing research, development, and product testing, the manufacturer
contained herein is based on data considered accurate. However, no warranty is
For our full Terms & Conditions of Sale go to
https://www.critical-environment.com/about/policies
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.
© 2023 All rights reserved. Data subject to change without notice. 7
Rev. C/D | 2023.07 cGas Detector for Indoor Public Spaces - Installation Manual
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.
returned goods, regardless of reason, must be accompanied with an RMA
number. Please read our Warranty and Returns Policy and follow our RMA
Instructions and Form.
If the product is deemed repairable, for liability reasons, CETCI will perform all
necessary repairs to restore the instrument to its full operating condition.
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
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.
8 © 2023 All rights reserved. Data subject to change without notice.
cGas Detector for Indoor Public Spaces - Installation Manual Rev. C/D | 2023.07
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
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
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
Critical Environment Technologies Canada Inc.
Unit 145, 7391 Vantage Way, Delta, BC, V4G 1M3, Canada
Toll Free: +1.877.940.8741
Telephone: +1.604.940.8741
Email: [email protected]
Website: www.critical-environment.com
incidental or consequential damages resulting from any defect in any manual,
even if advised of the possibility of such damages.
© 2023 All rights reserved. Data subject to change without notice. 9
Rev. C/D | 2023.07 cGas Detector for Indoor Public Spaces - Installation Manual
2 INTRODUCTION
2.1 General Description
Detector is designed for use in publicly occupied spaces:
• Where integrated demand controlled ventilation (DCV) is used for air
quality and energy savings
• For
volume refrigerant cooling and heating systems (VRF) are used to keep
the indoor environment comfortable
• For other continuous monitoring of hazardous gases in publicly
frequented areas
noticeability of the device by the public eye.
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 easy with true Plug & Play smart
MS-TP RS-485 or Modbus® RTU RS-485 output for communicating with a
controller, Building Automation System or other control panel.
The analog models (CGAS-AP) have one analog output signal or a jumper
selectable 0-10 volt, 2-10 volt, etc. output.
sensor or a remote refrigerant sensor (dongle). The internal sensor model is
10 © 2023 All rights reserved. Data subject to change without notice.
cGas Detector for Indoor Public Spaces - Installation Manual Rev. C/D | 2023.07
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
transmitter operates by diffusion.
2.2 Key Features
• 1 or 2 gas channel operation (depends on model)
•
output (signals gas concentration reading)
•
MS/TP communication protocols for communication with a Controller or
Building Automation System (BAS)
• 24 volt DC or (ground referenced) AC power
•
• Easy Plug & Play Smart sensor replacement at end of life
•
• One SPDT dry contact relay with internal buzzer*
• Optional SPDT dry contact relay**
• Internal PM2.5 particulate sensor available
• Optional Relative Humidity and Temperature sensor
•
• RoHS compliant circuit boards
• Auto resetting fuse
NOTE:
Analog models have one analog output. Factory default analog output is the
gas reading.
© 2023 All rights reserved. Data subject to change without notice. 11
Rev. C/D | 2023.07 cGas Detector for Indoor Public Spaces - Installation Manual
*Option RBZ
•
rated 90 dB @ 10 cm / 4 in
• Available as an option for cGas models with a 4 series electrochemical
sensor, combustible (catalytic) sensor, solid state refrigerant sensor or
onward)
• Comes standard in cGas models with a 7 series electrochemical sensor,
IR refrigerant sensor or CO2 sensor
**Option -RLY
•
• Available as an option with single channel models with a 4 series
electrochemical sensor, combustible (catalytic) sensor, solid state
refrigerant sensor or PID sensor
NOTES:
• Single channel models with a CO2 sensor come with relay and buzzer.
• Dual channel models with CO and CO2 sensors come with relay and
buzzer.
• Dual channels with CO2 and PM sensor cannot have a relay and buzzer.
If after reading through the manual, you have any questions, please do not
hesitate to contact our service department for technical support.
12 © 2023 All rights reserved. Data subject to change without notice.
cGas Detector for Indoor Public Spaces - Installation Manual Rev. C/D | 2023.07
3 INSTRUMENT SPECIFICATIONS
3.1 Technical Specications
MECHANICAL
Enclosure
Weight 400 g / 14 oz
Size
Dongle Cable Length 9 m / 29.5 ft (only available with the CGAS-AP-RD
and CGAS-DP-RD models)
USER INTERFACE
Display 2-line by 16 character graphic LCD
Push Buttons Initiate calibration and menu options with internal UP,
DOWN and ENTER push buttons
USB Port Internal port for USB memory stick connection for
Audible Alarm
Rated 90dB @ 10 cm / 4in, user enable/disable
Comes standard with all 7 series electrochemical
and IR refrigerant sensor models. Can be added as
Option -RBZ to other models.
© 2023 All rights reserved. Data subject to change without notice. 13
Rev. C/D | 2023.07 cGas Detector for Indoor Public Spaces - Installation Manual
ELECTRICAL
Power Requirement
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
*dependent on sensor type. Refer to Section 6.8 Power Draw Requirements
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)
Communication
Modbus® RTU
(version 1.1b3)
RS-485
Data bits: 8
Start bits: 1
Stop bits: 1
Parity: none, odd or even
14 © 2023 All rights reserved. Data subject to change without notice.
cGas Detector for Indoor Public Spaces - Installation Manual Rev. C/D | 2023.07
Digital Output
(CGAS-DP models)
Communication
BACnet® MS/TP
(version
1 rev 14) RS-485
BACnet® MS/TP
ANSI/ASHRAE standard 135 BACnet®
Communication protocol: 135-2012
Stop bits: 1
Data bits: 8
*100 is the default for transmitters only
*101 increasing sequentially is the default for a
system controller and transmitters
Analog Output
(CGAS-AP models)
One Linear 4 - 20 mA output or
jumper selectable 0-10, 2-10 volts, etc. output
Relay & Buzzer
(Standard and
Option -RBZ)
with internal buzzer rated 90 dB @ 10
cm / 4 in, enable/disable
Relay (Option -RLY)
RH and Temperature
(Option -RHT)
User selectable units (oC or oF), user selectable
display or hide readings
ENVIRONMENTAL
Operating
Temperature
0°C to 40°C / 32°F to 104°F (standard)
Operating Humidity 15 - 90% RH non-condensing
Pollution Degree Degree 2
Altitude below 2,000 m
© 2023 All rights reserved. Data subject to change without notice. 15
Rev. C/D | 2023.07 cGas Detector for Indoor Public Spaces - Installation Manual
CERTIFICATION
Model: CGAS-DP-XXX
S/N: CGASDP1909A0010
Model: CGAS-AP-XXX
S/N: CGASAP1909A0010
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 © 2023 All rights reserved. Data subject to change without notice.
cGas Detector for Indoor Public Spaces - Installation Manual Rev. C/D | 2023.07
3.2 Enclosure Dimensions
4 SENSOR SPECIFICATIONS
4.1 CGAS-AP Analog - Single Channel Sensors
PART NUMBER SENSOR RANGE LIFESPAN
CGAS-AP-CO2-2K 2) 0 - 2,000 ppm ~ 8 years
CGAS-AP-CO2-5K 2) 0 - 5,000 ppm ~ 8 years
CGAS-AP-CO2-
10K 2)0 - 10,000
ppm ~ 8 years
CGAS-AP-CO2-5% 2) 0 - 5% vol ~ 8 years
CGAS-AP-CO Electrochemical Carbon
0 - 200 ppm ~ 6 years
© 2023 All rights reserved. Data subject to change without notice. 17
Rev. C/D | 2023.07 cGas Detector for Indoor Public Spaces - Installation Manual
CGAS-AP-CH2O Electrochemical
Formaldehyde (CH2O) 0 - 5 ppm ~ 2 years
CGAS-AP-
CCH4-100
Catalytic Methane (CH4)
sensor 0 - 100% LEL ~ 5 years
CGAS-AP-O2 2)
sensor 0 - 25% vol ~ 3 years
CGAS-AP-PM User selectable PM1, PM2.5 (default) or PM10
Particulate sensor
CGAS-AP-SLP PID TVOC sensor 0 - 30 ppm
CGAS-AP-SPH PID TVOC sensor 0 - 300 ppm
CGAS-AP-IR410A Infrared R410A Refrigerant
(internal) 0 -2,000 ppm ~ 8 years
CGAS-AP-IR507A Infrared R410A Refrigerant
(internal) 0 -2,000 ppm ~ 8 years
CGAS-AP-SR410A Solid State R410A Refrigerant
(internal) 0 -2,000 ppm ~ 5 years
CGAS-AP-SR507A Solid State R410A Refrigerant
(internal) 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
18 © 2023 All rights reserved. Data subject to change without notice.
cGas Detector for Indoor Public Spaces - Installation Manual Rev. C/D | 2023.07
4.2 CGAS-DP Digital - Single Channel Sensors
PART NUMBER SENSOR RANGE LIFESPAN
CGAS-DP-CO2-2K 2) 0 - 2,000 ppm ~ 8 years
CGAS-DP-CO2-5K 2) 0 - 5,000 ppm ~ 8 years
CGAS-DP-CO2-
10K 2)0 - 10,000
ppm ~ 8 years
CGAS-DP-CO2-5% 2) 0 - 5% vol ~ 8 years
CGAS-DP-CO Electrochemical Carbon
0 - 200 ppm ~ 6 years
CGAS-DP-CH2O Electrochemical
Formaldehyde (CH2O) 0 - 5 ppm ~ 2 years
CGAS-DP-
CCH4-100
Catalytic Methane (CH4)
sensor 0 - 100% LEL ~ 5 years
CGAS-DP-O2 2)
sensor 0 - 25% vol ~ 3 years
CGAS-DP-PM User selectable PM1, PM2.5 (default) or PM10
Particulate sensor
CGAS-DP-RHT Relative Humidity and Temperature sensor
CGAS-DP-SLP PID TVOC sensor 0 - 30 ppm
CGAS-DP-SPH PID TVOC sensor 0 - 300 ppm
CGAS-DP-IR410A Infrared R410A Refrigerant
(internal) 0 -2,000 ppm ~ 8 years
CGAS-DP-IR507A Infrared R410A Refrigerant
(internal) 0 -2,000 ppm ~ 8 years
© 2023 All rights reserved. Data subject to change without notice. 19
Rev. C/D | 2023.07 cGas Detector for Indoor Public Spaces - Installation Manual
CGAS-DP-SR410A Solid State R410A Refrigerant
(internal) 0 -2,000 ppm ~ 5 years
CGAS-DP-SR507A Solid State R410A Refrigerant
(internal) 0 -2,000 ppm ~ 5 years
CGAS-DP-RD +
ESH-B-SR410A
Solid State R410A Refrigerant
(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
4.3 CGAS-DP Digital - Dual Channel Sensors
PART NUMBER SENSOR RANGE LIFESPAN
CGAS-DP-CO-
CO2-2K
Electrochemical Carbon
2)
0 - 200 ppm
0 - 2,000 ppm
~ 6 years
~ 8 years
CGAS-DP-CO-
CO2-5K
Electrochemical Carbon
2)
0 - 200 ppm
0 - 5,000 ppm
~ 6 years
~ 8 years
CGAS-DP-CO-
CO2-5%
Electrochemical Carbon
2)
0 - 200 ppm
0 - 5% vol
~ 6 years
~ 8 years
CGAS-DP-CO2-
2K-PM
(CO2) and
Particulate sensor
0 - 2,000 ppm
user selectable
~ 8 years
CGAS-DP-CO2-
5K-PM
(CO2) and
Particulate sensor
0 - 5,000 ppm
user selectable
~ 8 years
20 © 2023 All rights reserved. Data subject to change without notice.
cGas Detector for Indoor Public Spaces - Installation Manual Rev. C/D | 2023.07
CGAS-DP-CO2-
5%-PM
(CO2) and
Particulate sensor
0 - 5% vol
user selectable
~ 8 years
CGAS-DP-CO-PM
Electrochemical Carbon
Particulate sensor
0 - 200 ppm
user selectable
~ 6 years
4.4 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 readings.
For digital models the gas, RH and temperature readings can be sent to a
controller or BAS/DDC via the Modbus® or BACnet® communication protocol.
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