Critical Environment Technologies CGAS-AP User manual
Rev. C/D | 2023.03
www.critical-environment.com
cGas Detector Indoor Public Spaces
Installation Manual
2 © 2023 All rights reserved. Data subject to change without notice.
cGas Detector for Indoor Public Spaces - Installation Manual Rev. C/D | 2023.03
NEED MORE INFORMATION?
This is the Installation Manual for the cGas Detector models CGAS-AP and
CGAS-DP 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 | 2023.03 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................................. 17
4.3 CGAS-DP Digital - Dual Channel Gas Sensors.................................... 19
4.4 RH & Temperature Sensor (Option -RHT) ........................................... 20
5 INSTRUMENT FEATURES ............................................................................20
5.1 Front Exterior Enclosure ...................................................................... 20
5.2 Enclosure with Front Cover Removed................................................. 21
5.3 Enclosure Bottom................................................................................. 22
5.4 CGAS-AP Analog - Interior System Layout ......................................... 23
5.5 CGAS-DP Digital - Interior System Layout .......................................... 24
6 INSTALLATION ............................................................................................25
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 | 2023.03
6.2 Protection Against Electrical Risks..................................................... 26
6.3 Mounting the Transmitter.................................................................... 27
6.3.1 Wet Environment Considerations ................................................ 27
6.3.2 EMI and RF Interference Considerations ................................... 27
6.3.3 Mounting Height (Sensor Dependent) ........................................ 28
6.4 Enclosure Mounting Components ...................................................... 29
6.5 Wiring Connections.............................................................................. 30
6.5.1 Analog Wiring Connections........................................................... 30
6.5.2 Analog Wire Gauge vs Run Length.............................................. 31
6.5.3 Digital Wire Wiring Connections................................................... 32
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 (if installed) ........................................................ 37
6.6 Power Draw Consumption Chart......................................................... 38
7 BASIC SYSTEM OPERATION .......................................................................39
7.1 Power-up and Warm-up Process from Factory.................................. 39
7.2 Navigating the Menu Structure ........................................................... 40
7.3 Accessing the Menu with Passcodes................................................. 41
7.4 Display Settings.................................................................................... 41
7.4.1 Adjusting Display Brightness........................................................ 42
................................................................... 42
7.5 Alarm Status, Fault Detection and Communication Failure Alerts ... 43
7.6 Change Analog Output from Milliamps to Voltage............................ 44
7.7 Change Units (oC or oF) of Temperature Readings............................. 45
7.8 Temperature and/or Relative Humidity Offset ................................... 46
7.9 Test Functions...................................................................................... 48
7.9.1 Test Analog Output (CGAS-AP models)...................................... 48
7.9.2 Test Digital Output (CGAS-DP models)....................................... 49
7.9.3 Test Relay and Buzzer (if installed) ............................................. 50
8 TROUBLE SHOOTING...................................................................................51
© 2023 All rights reserved. Data subject to change without notice. 5
Rev. C/D | 2023.03 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:
______________________________________________________
6 © 2023 All rights reserved. Data subject to change without notice.
cGas Detector for Indoor Public Spaces - Installation Manual Rev. C/D | 2023.03
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 | 2023.03 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 | 2023.03
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 | 2023.03 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 | 2023.03
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.
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