Critical Environment Technologies CGAS-AP User manual

Rev. A | 2020.11
www.critical-environment.com
cGas Detector Indoor Public Spaces
Installation Manual

2 © 2020 All rights reserved. Data subject to change without notice.
cGas Detector for Indoor Public Spaces - Installation Manual Rev. A | 2020.11
NEED MORE INFORMATION?
This is the Installation Manual for the cGas Detector models CGAS-AP and
CGAS-DP for indoor public spaces.
The Operation Manual can be downloaded/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 Channels
• How to Install a Replacement Smart Sensor
• How to Add a New Smart Sensor
• Calibration
• Accessories

© 2020 All rights reserved. Data subject to change without notice. 3
Rev. A | 2020.11 cGas Detector for Indoor Public Spaces - Installation Manual
TABLE OF CONTENTS
1 POLICIES .......................................................................................................6
1.1 Important Note....................................................................................... 6
1.2 Warranty Policy ...................................................................................... 7
1.3 Service Policy ......................................................................................... 7
1.4 Copyrights .............................................................................................. 8
1.5 Disclaimer............................................................................................... 8
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 ..........................................................................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 Digital - Interior System Layout........................................................... 23
6 INSTALLATION ............................................................................................25
6.1 General Safety Warnings ..................................................................... 26
6.2 Protection Against Electrical Risks..................................................... 26

4 © 2020 All rights reserved. Data subject to change without notice.
cGas Detector for Indoor Public Spaces - Installation Manual Rev. A | 2020.11
6.3 Mounting the Transmitter.................................................................... 26
6.3.1 Wet Environment Considerations ................................................ 27
6.3.2 EMI and RF Interference Considerations ................................... 27
6.3.3 Mounting Height (Sensor Dependent) ........................................ 27
6.4 Enclosure Mounting Components ...................................................... 29
6.4.1 Enclosure Base................................................................................ 30
6.4.2 Enclosure Bottom ........................................................................... 30
6.5 Wiring Connections.............................................................................. 30
6.5.1 Analog Wiring Connections........................................................... 30
6.5.2 Analog Wire Gauge vs Run Length.............................................. 32
6.5.3 Digital Wire Wiring 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 (oC or oF) of Temperature Readings............................. 41
7.5 Temperature and/or Relative Humidity Offset ................................... 42
7.6 Test Functions...................................................................................... 43
7.6.1 Test Analog Output......................................................................... 44
7.6.2 Test Digital Output .......................................................................... 45
7.6.3 Test Relay ......................................................................................... 46
8 MODBUS & BACNET CONFIGURATION........................................................47
8.1 Changing Digital Communication Type in the Field........................... 47
8.2 Con!guring Modbus® Settings........................................................... 48
8.2.1 Change Modbus® MAC Address................................................. 48
8.2.2 Change Baud Rate .......................................................................... 49

© 2020 All rights reserved. Data subject to change without notice. 5
Rev. A | 2020.11 cGas Detector for Indoor Public Spaces - Installation Manual
8.2.3 Modbus® Holding Registers ........................................................ 50
8.3 Con•guring 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

6 © 2020 All rights reserved. Data subject to change without notice.
cGas Detector for Indoor Public Spaces - Installation Manual Rev. A | 2020.11
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:
______________________________________________________

© 2020 All rights reserved. Data subject to change without notice. 7
Rev. A | 2020.11 cGas Detector for Indoor Public Spaces - Installation Manual
1.2 Warranty Policy
Critical Environment Technologies Canada Inc. warrants the products we
manufacture (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. Sensors are consumable items and
once they leave our factory, we cannot reuse or resell them. As such, all sensor
sales are final. Should the sensor itself be faulty, there is a one-year pro-rated
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,
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 follow our RMA
Instructions and Form.
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.
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

8 © 2020 All rights reserved. Data subject to change without notice.
cGas Detector for Indoor Public Spaces - Installation Manual Rev. A | 2020.11
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, 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
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

© 2020 All rights reserved. Data subject to change without notice. 9
Rev. A | 2020.11 cGas Detector for Indoor Public Spaces - Installation Manual
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.
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]
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.

10 © 2020 All rights reserved. Data subject to change without notice.
cGas Detector for Indoor Public Spaces - Installation Manual Rev. A | 2020.11
2 INTRODUCTION
2.1 General Description
Thank you for purchasing our low profile cGas Detector Transmitter. The cGas
Detector is designed for use in publicly occupied spaces:
• where integrated demand controlled ventilation (DCV) is used for air
quality and energy savings
• for continuous monitoring of refrigerants where high-efficiency, high
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
The low profile, aesthetically 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 #ush 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 easy with true Plug & Play smart
sensors that arrive pre-calibrated. The !rmware and con!guration can be
upgraded in the !eld using the USB connection.
The digital models (CGAS-DP) are user con!gurable in the !eld for BACnet®
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.
Both the analog and digital models may be con!gured with an internal gas

© 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 flush 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 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 upgradable firmware/configuration 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 profile to reduce noticeability in public spaces
• RoHS compliant circuit boards
• Auto resetting fuse
NOTE: *Option may be restricted to certain models and/or gas configurations.
Analog models have one analog output. Factory default analog output is the
gas reading.

12 © 2020 All rights reserved. Data subject to change without notice.
cGas Detector for Indoor Public Spaces - Installation Manual Rev. A | 2020.11
Option -RHT is an RH & Temperature sensor (oC or oF)
• Available with single channel con!gurations
• Available with dual channel con!gurations that have the
standard CO sensor
Option -RLY is a 1 SPDT dry contact relay, rated 30 volts, 2 amps max
• Available with single channel con! gurations
Options -RHT and -RLY (both together) are available with CO and CO2
con!gurations 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 Speci!cations
MECHANICAL
Enclosure White ABS / Polycarbonate, low pro!le with
mounting plate
Weight 400 g / 14 oz
Size 127.7 mm x 119 mm x 40 mm / 5.0 in x 4.7 in x 1.6 in
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

© 2020 All rights reserved. Data subject to change without notice. 13
Rev. A | 2020.11 cGas Detector for Indoor Public Spaces - Installation Manual
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
!eld con!guration/!rmware upgrades
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. 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)
Communication
Modbus® RTU
(version 1.1b3)
RS-485
Modbus® ID*: 100 (default, con!gurable)
Baud rate: 19,200 (default, con!gurable)
Data bits: 8
Start bits: 1
Stop bits: 1
Parity: none, odd or even

14 © 2020 All rights reserved. Data subject to change without notice.
cGas Detector for Indoor Public Spaces - Installation Manual Rev. A | 2020.11
*100 is the default for transmitters only
*101 increasing sequentially is the default for a
system controller and transmitters
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
Baud Rate: 76,800 (default, con!gurable)
Base Address: 270 (default, con!gurable)
MAC Address: 100 (default, con!gurable)
Parity: no parity (default, con!gurable)
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 CO2gas con!gurations
User selectable units
Selectable analog output (default is gas reading)
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

© 2020 All rights reserved. Data subject to change without notice. 15
Rev. A | 2020.11 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 © 2020 All rights reserved. Data subject to change without notice.
cGas Detector for Indoor Public Spaces - Installation Manual Rev. A | 2020.11
3.2 Enclosure 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 (CH2O) 0 - 5 ppm ~ 2 years

© 2020 All rights reserved. Data subject to change without notice. 17
Rev. A | 2020.11 cGas Detector for Indoor Public Spaces - Installation Manual
CGAS-AP-
CCH4-100
Catalytic Methane (CH4)
sensor 0 - 100% LEL ~ 5 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-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
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-CO2-5% Infrared Carbon Dioxide (CO2) 0 - 5% vol ~ 8 years
CGAS-DP-CO Electrochemical Carbon
Monoxide (CO) 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

18 © 2020 All rights reserved. Data subject to change without notice.
cGas Detector for Indoor Public Spaces - Installation Manual Rev. A | 2020.11
CGAS-DP-PM User selectable PM1, PM2.5 (default) or PM10
Particulate sensor
CGAS-DP-SLP PID TVOC sensor 0 - 30 ppm
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
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 - 5,000 ppm
~ 6 years
~ 8 years
CGAS-DP-CO-
CO2-5%
Electrochemical Carbon
Monoxide (CO) and Infrared
Carbon Dioxide (CO2)
0 - 200 ppm
0 - 5% vol
~ 6 years
~ 8 years
CGAS-DP-CO2-
5K-PM
Infrared Carbon Dioxide
(CO2) and
Particulate sensor
0 - 5,000 ppm
user selectable
~ 8 years

© 2020 All rights reserved. Data subject to change without notice. 19
Rev. A | 2020.11 cGas Detector for Indoor Public Spaces - Installation Manual
CGAS-DP-CO2-
5%-PM
Infrared Carbon Dioxide
(CO2) and
Particulate sensor
0 - 5% vol
user selectable
~ 8 years
CGAS-DP-CO-PM
Electrochemical Carbon
Monoxide (CO) and
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.

20 © 2020 All rights reserved. Data subject to change without notice.
cGas Detector for Indoor Public Spaces - Installation Manual Rev. A | 2020.11
5 INSTRUMENT FEATURES
5.1 Exterior Enclosure
NUMBER FEATURE FUNCTION
ŒDisplay LCD Display
•Sensor Vents Allows gas diffusion into sensor
ŽRemote Dongle
(ie. ESH-B-SR410A)
Remote refrigerant sensor for
hotel applications
(for CGAS-AP-RD and
CGAS-DP-RD models only)
closure
FEATURE
FUNCTI
ON
Œ
Ž
••