Critical Environment Technologies CGAS-AP User manual

www.critical-environment.com
Rev. A | 2019.10
CGAS-AP &CGAS-DP Transmitters
Installation Manual
For Indoor
Public Spaces

2 © 2019 All rights reserved. Data subject to change without notice.
cGas Detector for Indoor Public Spaces - Installation Manual Rev. A | 2019.10
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 this QR code to open the pdf version of the manual:
The Operation Manual includes:
• Adjusting Display Settings
• Alarm Status, Fault Detection and Communication Failure Notications
• 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
• Maintenance
• Troubleshooting

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Rev. A | 2019.10 cGas Detector for Indoor Public Spaces - Installation Manual
TABLE OF CONTENTS
1 POLICIES..........................................................................................................6
1.1 Important Note................................................................................................6
1.2Warranty 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
3.1Technical 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 Optional RH & Temperature Sensor (Option -RHT) .........................................18
5 INSTRUMENT FEATURES.............................................................................19
5.1 Exterior Enclosure ..........................................................................................19
5.2 Analog - Interior System Layout.....................................................................20
5.3 Digital - Interior System Layout......................................................................22

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cGas Detector for Indoor Public Spaces - Installation Manual Rev. A | 2019.10
6 INSTALLATION..............................................................................................24
6.1 General Safety Warnings................................................................................24
6.2 Protection Against Electrical Risks..................................................................25
6.3 Mounting theTransmitter..............................................................................25
6.3.1Wet Environment Considerations ....................................................................25
6.3.2 EMI and RF Interference Considerations..........................................................26
6.3.3 Mounting Height (Sensor Dependent) ............................................................26
6.4 Enclosure Mounting Components ..................................................................27
6.4.1 Enclosure Base ................................................................................................27
6.4.2 Enclosure Bottom............................................................................................28
6.5Wiring Connections........................................................................................28
6.5.1 AnalogWiring Connections.............................................................................28
6.5.2 AnalogWire Gauge vs Run Length ..................................................................30
6.5.3 Digital Wire Wiring Connections......................................................................31
6.5.4 Digital Wire Gauge vs Run Length ...................................................................33
6.5.5Wiring the Remote (Dongle) Sensor to the Remote 5V Smart Sensor Board....34
6.5.6Wiring the Relay Smart Board (Option -RLY) ...................................................34
7 BASIC SYSTEM OPERATION........................................................................35
7.1 Power-up andWarm-up Process from Factory ...............................................35
7.2 Navigating the Menu Structure......................................................................35
7.3 Accessing the Menu with Passcodes...............................................................36
7.4 Change Units (oC or oF) ofTemperature Readings ...........................................38
7.5Temperature and/or Relative Humidity Oset................................................39
7.6 Test Functions ................................................................................................40
7.6.1 Test Analog Output..........................................................................................40
7.6.2 Test Digital Output ..........................................................................................41
7.6.3 Test Relay ........................................................................................................43

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Rev. A | 2019.10 cGas Detector for Indoor Public Spaces - Installation Manual
8 MODBUS & BACNET CONFIGURATION ....................................................44
8.1 Changing CommunicationType (Modbus®/BACnet®) in the Field ..................44
8.2 Conguring Modbus® Settings.......................................................................45
8.2.1 Change Modbus® MAC Address.......................................................................45
8.2.2 Change Baud Rate...........................................................................................46
8.2.3 Modbus® Holding Registers ............................................................................47
8.3 Conguring BACnet® Settings........................................................................47
8.3.1 Change BACnet® MAC Address ........................................................................47
8.3.2 Change BACnet® Instance ID ...........................................................................47
8.3.3 Change BACnet® Baud Rate.............................................................................48
8.3.4 BACnet® PICS Information...............................................................................49

6 © 2019 All rights reserved. Data subject to change without notice.
cGas Detector for Indoor Public Spaces - Installation Manual Rev. A | 2019.10
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 qualied electrician or factory trained technician and according
to instructions indicated in this manual.This instrument should be inspected and calibrated
regularly by a qualied and trained technician. This instrument has not been designed to be
intrinsically safe. For your safety, do not use it in classied hazardous areas (explosion-rated
environments).
INSTRUMENT SERIAL NUMBER:
______________________________________________________
PURCHASE DATE:
______________________________________________________
PURCHASED FROM:
______________________________________________________

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Rev. A | 2019.10 cGas Detector for Indoor Public Spaces - Installation Manual
1.2 Warranty Policy
Critical Environment Technologies Canada Inc. (the manufacturer) warrants this gas monitoring
instrument, (excluding sensors, battery packs, batteries, pumps and lters), 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 aected 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 specications 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 goods must be shipped to the manufacturer by prepaid freight. All returned goods (whether
under warranty or not) must be pre-authorized by obtaining a return merchandise authorization
(RMA) number. Contact the manufacturer for an RMA number and the procedures required for
product transport.

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cGas Detector for Indoor Public Spaces - Installation Manual Rev. A | 2019.10
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 oce 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 | 2019.10 cGas Detector for Indoor Public Spaces - Installation 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 modication 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 tness 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 eorts to improve its products and their documentation, the

10 © 2019 All rights reserved. Data subject to change without notice.
cGas Detector for Indoor Public Spaces - Installation Manual Rev. A | 2019.10
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 rmware, please contact CETCI at
the following address:
Critical Environment Technologies Canada Inc.
Unit 145, 7391VantageWay, Delta, BC, V4G 1M3, Canada
Toll Free: +1.877.940.8741
Telephone: [phone]
Fax: [phone]
Email: [e-mail]
Website: www.critical-environment.com
In no event will CETCI, its ocers 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 low prole cGas DetectorTransmitter. 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-eciency, 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

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Rev. A | 2019.10 cGas Detector for Indoor Public Spaces - Installation Manual
The low prole, 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 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.
Both the analog and digital models may be congured with an internal gas sensor or a remote
refrigerant sensor (dongle). The internal sensor model is ideal for mounting ush with the wall.The
remote refrigerant sensor model has a 9 m / 29.5 ft dongle cable that is ideal for use in packaged
terminal air conditioner (PTAC) applications.
The sensors in this device are accurate enough to measure to Occupational Health & Safety (OHS)
hazardous levels for toxic gases.The transmitter operates by diusion.
2.2 Key Features
• 1 or 2 gas channel operation (depends on model)
• One 4-20 mA analog output or user con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 specic application requirements

12 © 2019 All rights reserved. Data subject to change without notice.
cGas Detector for Indoor Public Spaces - Installation Manual Rev. A | 2019.10
• 24 volt DC or (ground referenced) AC power
• In eld upgradable rmware/conguration via USB connection
• Bright LCD display
• Option -RLY: One SPDT dry contact, rated 30 volts, 2 amps max
• Option -RHT *: Relative Humidity andTemperature sensor
• Internal PM2.5 particulate sensor available
• Low prole to reduce noticeability in public spaces
• RoHS compliant circuit boards
• Auto resetting fuse
NOTE: * Analog models have one analog output. Factory default analog output is the gas reading
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)

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Rev. A | 2019.10 cGas Detector for Indoor Public Spaces - Installation Manual
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 eld
conguration/rmware upgrades
Audible Alarm none
ELECTRICAL
Power Requirement
16 - 30VDC, 3 W, Class 2
12 - 27VAC, 50-60 Hz, 3 VA, Class 2
24V recommended. Refer to Section 6.5 Wiring Connections
Digital Wiring VDC orVAC (ground referenced) four-conductor shielded 16 AWG
stranded within conduit, network wiring (daisy-chain)
AnalogWiring VAC (ground referenced) three-conductor shielded 18 AWG (or
larger) stranded
Fuses Automatic resetting thermal

14 © 2019 All rights reserved. Data subject to change without notice.
cGas Detector for Indoor Public Spaces - Installation Manual Rev. A | 2019.10
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
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)
Base Address: 270 (default)
MAC Address: 100 (default)
Parity: no parity
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 andTemperature
(Option -RHT)
Available with CO or CO2gas congurations
User selectable units
Selectable analog output (default is gas reading)

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Rev. A | 2019.10 cGas Detector for Indoor Public Spaces - Installation Manual
ENVIRONMENTAL
OperatingTemperature 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
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 © 2019 All rights reserved. Data subject to change without notice.
cGas Detector for Indoor Public Spaces - Installation Manual Rev. A | 2019.10
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-LCO Electrochemical Carbon
Monoxide (CO) 0 - 200 ppm ± 6 years
CGAS-AP-SR410A * Solid State R410A Refrigerant
(internal) 0 -2,000 ppm ± 5 years

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CGAS-AP-RD +
ESH-B-SR410A *
Solid State R410A Refrigerant
(remote dongle) 0 -2,000 ppm ± 5 years
CGAS-AP-PM PM2.5 Particulate sensor 2.5 μg/m3
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-LCO Electrochemical Carbon
Monoxide (CO) 0 - 200 ppm ± 6 years
CGAS-DP-SR410A * 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-PM PM2.5 Particulate sensor 2.5 μg/m3
*Other Refrigerants may be available upon request.

18 © 2019 All rights reserved. Data subject to change without notice.
cGas Detector for Indoor Public Spaces - Installation Manual Rev. A | 2019.10
4.3 Digital - Dual Channel Sensors
PART NUMBER SENSOR RANGE LIFESPAN
CGAS-DP-LCO-CO2-5K
Electrochemical Carbon Monoxide
(CO) and Infrared Carbon Dioxide
(CO2)
0 - 200 ppm
0 - 5,000 ppm
± 6 years
± 8 years
CGAS-DP-LCO-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
PM2.5 Particulate sensor
0 - 5,000 ppm
2.5 μg/m3
± 8 years
CGAS-DP-CO2-5%-PM Infrared Carbon Dioxide (CO2) and
PM2.5 Particulate sensor
0 - 5% vol
2.5 μg/m3
± 8 years
CGAS-DP-LCO-PM Electrochemical Carbon Monoxide
(CO) and PM2.5 Particulate sensor
0 - 200 ppm
2.5 μg/m3
± 6 years
4.4 RH & Temperature Sensor (Option -RHT)
NOTE: The optional RH & temperature sensor is only available with analog or digital
models that have a Carbon monoxide (CO) or a Carbon dioxide (CO2) gas sensor.
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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Rev. A | 2019.10 cGas Detector for Indoor Public Spaces - Installation Manual
5 INSTRUMENT FEATURES
5.1 Exterior Enclosure
NUMBER FEATURE FUNCTION
ŒDisplay LCD Display
•Sensor Vents Allows gas diusion into sensor
ŽRemote Dongle
(ex. ESH-B-SR410A)
Remote refrigerant sensor for hotel
applications (for CGAS-AP-RD and
CGAS-DP-RD models only)
Enclosure
FEATURE
FUNCTION
Œ
Ž
••

20 © 2019 All rights reserved. Data subject to change without notice.
cGas Detector for Indoor Public Spaces - Installation Manual Rev. A | 2019.10
5.2 Analog - Interior System Layout
Back Side of
Circuit Board
(removed from
enclosure)
•
•
”
”
”
’
“
•
Front Side of
Circuit Board
Υ
•
Œ
‘
Ž
“
’
•