Critical Environment Technologies CGAS-A User manual
Rev. C | 2023.03
www.critical-environment.com
CGAS-A Detector
Analog Transmitter
Installation Manual
2 © 2023 All rights reserved. Data subject to change without notice.
cGas Detector Analog Transmitter - Installation Manual Rev. C | 2023.03
NEED MORE INFORMATION?
This is the Installation Manual for the cGas Detector Analog Transmitter. 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 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 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 | 2023.03 cGas Detector Analog Transmitter - 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........................................................................................... 9
3 INSTRUMENT SPECIFICATIONS..................................................................11
3.1 Technical Specications...................................................................... 11
3.2 Enclosure Dimensions......................................................................... 14
4 SENSOR SPECIFICATIONS ..........................................................................15
4.1 Internal Gas Sensor Types................................................................... 15
4.2 ESH-A- Remote Gas Sensor Types...................................................... 19
4.3 RH & Temperature Sensor (Option -RHT) ........................................... 20
4.4 Calibration Extending Firmware (CEF) and Sensor Aging................. 20
5 INSTRUMENT FEATURES ............................................................................21
5.1 Exterior Enclosure................................................................................ 21
5.2 Interior System Layout......................................................................... 22
6 INSTALLATION ............................................................................................23
6.1 Special Considerations for Different Types of Sensors..................... 23
6.2 General Safety and Maintenance Warnings ....................................... 24
6.3 Protection Against Electrical Risks..................................................... 25
4 © 2023 All rights reserved. Data subject to change without notice.
cGas Detector Analog Transmitter - Installation Manual Rev. C | 2023.03
6.4 Protection Against Mechanical Risks................................................. 25
6.5 Mounting the Transmitter.................................................................... 26
6.5.1 Wet Environment Considerations ................................................ 27
6.5.2 EMI and RF Interference Considerations ................................... 27
6.5.3 Mounting Heights (sensor and application dependent).......... 28
6.6 Enclosure Mounting Components ...................................................... 30
6.6.1 Enclosure Base................................................................................ 30
6.6.2 Enclosure Bottom ........................................................................... 31
6.7 Wiring Connections.............................................................................. 31
6.7.1 Analog Wire Gauge vs Run Length.............................................. 33
6.7.2 Wiring the Relay (if installed) ........................................................ 34
6.7.3 ESH-A Remote Sensor Wiring Connection................................. 35
6.8 Power Draw Requirements.................................................................. 37
7 BASIC SYSTEM OPERATION .......................................................................37
7.1 Power-up and Warm-up Process from the Factory............................ 38
7.2 Navigating the Menu Structure ........................................................... 38
7.3 Accessing the Menu with Passcodes................................................. 39
7.4 Display Settings.................................................................................... 40
7.4.1 Adjust Display Brightness ............................................................. 40
................................................................... 41
7.5 Alarm Status, Fault Detection and Communication Failure Alerts ... 41
7.6 Change Analog Output from Milliamps to Voltage............................ 42
7.7 Change Units (oC or oF) of Temperature Readings............................. 44
7.8 Temperature and / or Relative Humidity Offset ................................. 45
7.9 Test Functions...................................................................................... 46
7.9.1 Test Analog Output......................................................................... 46
7.9.2 Test Relay and Buzzer (if installed) ............................................. 47
8 TROUBLESHOOTING....................................................................................48
© 2023 All rights reserved. Data subject to change without notice. 5
Rev. C | 2023.03 cGas Detector Analog Transmitter - 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 Analog Transmitter - Installation Manual Rev. C | 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
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
© 2023 All rights reserved. Data subject to change without notice. 7
Rev. C | 2023.03 cGas Detector Analog Transmitter - Installation Manual
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.
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
8 © 2023 All rights reserved. Data subject to change without notice.
cGas Detector Analog Transmitter - Installation Manual Rev. C | 2023.03
products meet this requirement and 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.
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. 9
Rev. C | 2023.03 cGas Detector Analog Transmitter - Installation Manual
2 INTRODUCTION
2.1 General Description
Thank you for purchasing our cGas Detector Transmitter. The cGas Detector
facilities, commercial HVAC, greenhouses, recreational facilities, refrigeration
plants, manufacturing plants and other light industrial applications.
The CGAS-A transmitter is available with internal or remote sensor and operates
by diffusion. The sensors utilized in this device are accurate enough to measure
2.2 Key Features
• Single gas channel
•
concentration reading)
• Easy Plug & Play Smart sensor replacement at end of life
• Pre-calibrated replacement sensors
•
application requirements
• 24 volt DC or (ground referenced) AC power
•
• LCD display
• Optional low temperature package for improved usability in cold
environments*
• Optional Relative Humidity and Temperature sensor
10 © 2023 All rights reserved. Data subject to change without notice.
cGas Detector Analog Transmitter - Installation Manual Rev. C | 2023.03
• One SPDT dry contact relay with internal buzzer**
• Optional SPDT dry contact relay***
• Optional splash guard, factory installed, IP54 rated enclosure
• Optional 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
*Option -LT
• A low temperature package with OLED display and internal heater for cold
environment applications down to -40°C / -40°F
•
**Option -RBZ
•
rated 90 dB @ 10 cm / 4 in
• Comes standard in CGAS models with a 7 series electrochemical sensor
or IR refrigerant sensor
• Available as an option for CGAS models with a 4 series electrochemical
sensor, combustible (catalytic) sensor, solid state refrigerant sensor or
PID 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:
4 series sticky gas sensor models cannot have a relay and buzzer.
© 2023 All rights reserved. Data subject to change without notice. 11
Rev. C | 2023.03 cGas Detector Analog Transmitter - Installation Manual
buzzer.
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 Specications
MECHANICAL
Enclosure
ABS / Polycarbonate, IP54 rating with splash guard
installed. Copper coated interior to reduce RF
interference.
Weight 400 g / 14 oz
Size
Conduit Entry Points 12.7 mm / 1/2 in diameter
Mounting Holes
4.47 mm / 0.175 in diameter
mm screw
USER INTERFACE
Display (standard)
to suppress reading display
Display (low temp) 2-line by 16-character OLED display for low
temperature applications (with Option -LT)
12 © 2023 All rights reserved. Data subject to change without notice.
cGas Detector Analog Transmitter - Installation Manual Rev. C | 2023.03
USB Port Internal port for USB memory stick connection for in
Push Buttons Initiate calibration and menu options with internal UP,
DOWN and ENTER push buttons
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.
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 6.7 Wiring
Connections
*dependent on sensor type. Refer to Section 6.8 Power Draw Requirements
Wiring 24 VDC or 24 VAC (ground referenced) 3-conductor
shielded 14-18 AWG stranded within conduit
Fuses Automatic resetting thermal
INPUT/OUTPUT
Output One Linear 4 - 20 mA output or
jumper selectable 0-10 or 2-10 volts output
Relay & Buzzer
(Standard and
Option -RBZ)
with internal buzzer rated 90 dB @ 10
cm / 4 in, enable/disable
© 2023 All rights reserved. Data subject to change without notice. 13
Rev. C | 2023.03 cGas Detector Analog Transmitter - Installation Manual
Relay (Option -RLY)
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
Pollution Degree Degree 2
Altitude below 2,000 m
CERTIFICATION
Model: CGAS-A-XXX
S/N: CGASA1807B00010
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.
14 © 2023 All rights reserved. Data subject to change without notice.
cGas Detector Analog Transmitter - Installation Manual Rev. C | 2023.03
3.2 Enclosure Dimensions
Above dimensions are shown with optional standard splash guard. Without
splash guard, thickness is 71 mm / 3.0 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.
NOTE: During calibration, the sensor response time will be slower with a splash
guard installed.
NOTE: The standard splash guard (Option -S) is optional for protecting non
sticky gas sensors in wash down applications. For sticky gas sensors such
as Chlorine (Cl22), Hydrogen Chloride (HCL), Hydrogen
Cyanide (HCN), Hydrogen Fluoride (HF), Ozone (O3) and Phosphine (PH3) order
the sticky gas splash guard Option -SN or use the metal splash guard
p/n: SCS-8000-WSG.
© 2023 All rights reserved. Data subject to change without notice. 15
Rev. C | 2023.03 cGas Detector Analog Transmitter - Installation Manual
4 SENSOR SPECIFICATIONS
4.1 Internal Gas Sensor Types
Internal 4 Series
Electrochemical Sensors Part Number Range Lifespan
CGAS-A-CO10 - 200 ppm ~3+ yrs
2H4O) CGAS-A-EETO 0 - 20 ppm ~2 yrs
Formaldehyde (CH2O) CGAS-A-CH2O 0 - 5 ppm ~2 yrs
Hydrogen (H2) CGAS-A-EH2 0 - 2,000 ppm ~2 yrs
Hydrogen Sulphide (H2S) CGAS-A-H2S 0 - 50 ppm ~2 yrs
CGAS-A-NO 0 - 100 ppm ~2 yrs
2) CGAS-A-NO2 0 - 10 ppm ~3+ yrs
2) CGAS-A-O2 0 - 25% Vol ~3 yrs
2) CGAS-A-SO2 0 - 20 ppm ~2 yrs
1
Internal 7 Series
Electrochemical Sensors Part Number Range Lifespan
Ammonia (NH3) CGAS-A-7NH3 0 - 500 ppm ~2 yrs
CGAS-A-7CO 0 - 200 ppm ~6 yrs
Chlorine (Cl2)CGAS-A-7CL2 0 - 5.0 ppm ~3 yrs
CGAS-A-7CL2-10 0 - 10 ppm ~3 yrs
16 © 2023 All rights reserved. Data subject to change without notice.
cGas Detector Analog Transmitter - Installation Manual Rev. C | 2023.03
2) CGAS-A-7CLO2 0 - 1 ppm ~2 yrs
Ethylene (C2H4) * CGAS-A-7C2H4 * 0 - 200 ppm ~2 yrs
Fluorine (F2) CGAS-A-7F2 0 - 1 ppm ~2 yrs
Hydrogen Chloride (HCl) CGAS-A-7HCL 0 - 30 ppm ~2 yrs
Hydrogen Cyanide (HCN) CGAS-A-7HCN 0 - 30 ppm ~2 yrs
Hydrogen Fluoride (HF) CGAS-A-7HF 0 - 10 ppm ~2 yrs
Hydrogen Sulphide (H2S) CGAS-A-7H2S 0 - 50 ppm ~2 yrs
2) CGAS-A-7NO2 0 - 10 ppm ~3+ yrs
Ozone (O3) CGAS-A-7O3 0 - 1 ppm ~2 yrs
Internal Infrared Sensors Part Number Range Lifespan
2)
R744
CGAS-A-CO2-2K 0 - 2,000 ppm
~ 8 yrs
CGAS-A-CO2-5K 0 - 5,000 ppm
CGAS-A-CO2-10K 0 - 10,000 ppm
CGAS-A-CO2-5% 0 - 5% vol
© 2023 All rights reserved. Data subject to change without notice. 17
Rev. C | 2023.03 cGas Detector Analog Transmitter - Installation Manual
Refrigerants:
R134A, R143A, R22, R32,
R227ea, R402A, R404A,
R407A, R407C, R407F,
R410A, R417A, R422A,
R422D, R427A, R434A,
R438A, R442A, R448A,
R449A, R450A, R452A,
R453A, R454A, R454B,
R455A, R507, R513A,
R514A, HFO1234YF,
HFO1234ZE,
HFO1233ZD
CGAS-A-IR134A
CGAS-A-IR143A
CGAS-A-IR22
CGAS-A-IR32
etc.
0 - 2,000 ppm ~8 yrs
Refrigerant RSF6 CGAS-A-IRSF6 0 - 1,000 ppm ~8 yrs
Internal Solid State
Sensors Part Numbers Range Lifespan
Refrigerants:
R134A, R22, R32, R402A,
R404A, R407C, R407F,
R410A, R422A, R422D,
R427A, R438A, R448A,
R449A, R450A, R452A,
R507A, R513A, R514A
CGAS-A-SR134A
CGAS-A-SR22
CGAS-A-SR32
etc.
0 - 2,000 ppm ~5 yrs
TVOC (Isobutylene) CGAS-A-STVOC 0 - 500 ppm ~5 yrs
18 © 2023 All rights reserved. Data subject to change without notice.
cGas Detector Analog Transmitter - Installation Manual Rev. C | 2023.03
Internal Catalytic
(Combustible) Sensors Part Number Range Lifespan
Butane (C4H10)CGAS-A-
CC4H10-100 0 - 100% LEL ~5 yrs
Ethanol or Dimethyl
Ether (C2H
6O)
CGAS-A-
CC2H6O-100 0 - 100% LEL ~5 yrs
Ethane (C2H6)CGAS-A-
CC2H6-100 0 - 100% LEL ~5 yrs
Hydrogen (H2) CGAS-A-CH2-100 0 - 100% LEL ~5 yrs
Methane (CH4) CGAS-A-CCH4-100 0 - 100% LEL ~5 yrs
Methanol (CHO) CGAS-A-
CCH4O-100 0 - 100% LEL ~5 yrs
Propane (C3H8)CGAS-A-
CC3H8-100 0 - 100% LEL ~5 yrs
Internal PID Sensors Part Number Range
TVOCs CGAS-A-SPL 0 - 30 ppm
TVOCs CGAS-A-SPH 0 - 300 ppm
Internal RH & Temp
Sensor (no gas sensor) Part Number
Relative Humidity and
Temperature CGAS-A-RHT
© 2023 All rights reserved. Data subject to change without notice. 19
Rev. C | 2023.03 cGas Detector Analog Transmitter - Installation Manual
No Internal Gas Sensor Part Number
Add a remote ESH-A
sensor CGAS-A-R
4.2 ESH-A-Remote Gas Sensor Types
Remote Catalytic
(Combustible) Sensors
Part Number Range Lifespan
Acetylene (C2H2)ESH-A- CC2H2-
100
0 - 100% LEL ~5 yrs
Hydrogen (H2) ESH-A-CH2-100 0 - 100% LEL ~5 yrs
Methane (CH4) ESH-A-CCH4-100 0 - 100% LEL ~5 yrs
Propane (C3H8) ESH-A-C3H8-100 0 - 100% LEL ~5 yrs
Remote Infrared Sensors Part Number Range Lifespan
Infrared Propane (C3H8) ESH-A-JET 0 - 100% LEL ~8 yrs
Remote PID Sensors Part Number Range
TVOCs ESH-A-SPL 0 - 30 ppm
ESH-A-SPH 0 - 300 ppm
20 © 2023 All rights reserved. Data subject to change without notice.
cGas Detector Analog Transmitter - Installation Manual Rev. C | 2023.03
4.3 RH & Temperature Sensor (Option -RHT)
The CGAS-A is a single channel device, it has one analog output. If ordered
with an internal or remote gas sensor and a relative humidity and temperature
sensor, the analog output signal will be used to send the gas reading signal to a
controller or BAS/DDC. Therefore, the RH & temperature readings are for display
purposes only, there is no current output or communication back to a controller
or BAS/DDC for RH or temperature readings when a gas sensor is present.
4.4 Calibration Extending Firmware (CEF) and Sensor Aging
The cGas Detector with integral electrochemical sensor(s) have been
the electrochemical CO and NO2sensors 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.
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