Critical Environment Technologies CGAS-A User manual
Rev. B | 2021.08
www.critical-environment.com
CGAS-A Gas Detector
Analog Transmitter
Installation Manual
2 © 2021 All rights reserved. Data subject to change without notice.
cGas Detector Analog Transmitter - Installation Manual Rev. B | 2021.08
NEED MORE INFORMATION?
This is the Installation Manual for the cGas Detector Analog Transmitter. If you
would like it in pdf form, click here to open and download it from our website.
If you need more information, refer to the cGAS Detector Operation Manual,
which covers topics such as:
• Relays - enable/disable, set ON/OFF Delays
• Enable/Disable 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
© 2021 All rights reserved. Data subject to change without notice. 3
Rev. B | 2021.08 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...................................................... 18
4.3 RH & Temperature Sensor (Option -RHT) ........................................... 19
4.4 Calibration Extending Firmware (CEF) and Sensor Aging................. 19
5 INSTRUMENT FEATURES ............................................................................20
5.1 Exterior Enclosure................................................................................ 20
5.2 Interior System Layout......................................................................... 21
6 INSTALLATION ............................................................................................22
6.1 Special Considerations for Different Types of Sensors..................... 22
6.2 General Safety Warnings ..................................................................... 23
6.3 Protection Against Electrical Risks..................................................... 24
4 © 2021 All rights reserved. Data subject to change without notice.
cGas Detector Analog Transmitter - Installation Manual Rev. B | 2021.08
6.4 Protection Against Mechanical Risks................................................. 24
6.5 Mounting the Transmitter.................................................................... 25
6.5.1 Wet Environment Considerations ................................................ 25
6.5.2 EMI and RF Interference Considerations ................................... 26
6.5.3 Mounting Heights (Sensor Dependent)...................................... 26
6.6 Enclosure Mounting Components ...................................................... 29
6.6.1 Enclosure Base................................................................................ 29
6.6.2 Enclosure Bottom ........................................................................... 30
6.7 Wiring Connections.............................................................................. 30
6.7.1 Analog Wire Gauge vs Run Length.............................................. 32
6.7.2 Wiring the Relay Smart Board (models with Option -RLY)...... 33
6.7.3 ESH-A Remote Sensor Wiring Connection................................. 33
7 BASIC SYSTEM OPERATION .......................................................................35
7.1 Power-up and Warm-up Process from the Factory............................ 35
7.2 Navigating the Menu Structure ........................................................... 36
7.3 Accessing the Menu with Passcodes................................................. 36
7.4 Display Settings.................................................................................... 37
7.4.1 Adjust Display Brightness ............................................................. 37
................................................................... 38
7.5 Alarm Status, Fault Detection and Communication Failure Alerts ... 39
7.6 Change Units (oC or oF) of Temperature Readings............................. 39
7.7 Temperature and / or Relative Humidity Offset ................................. 40
7.8 Test Functions...................................................................................... 41
7.8.1 Test Analog Output......................................................................... 41
7.8.2 Test Relay (models with Option -RLY)......................................... 42
8 TROUBLESHOOTING....................................................................................43
© 2021 All rights reserved. Data subject to change without notice. 5
Rev. B | 2021.08 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 © 2021 All rights reserved. Data subject to change without notice.
cGas Detector Analog Transmitter - Installation Manual Rev. B | 2021.08
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
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Rev. B | 2021.08 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 © 2021 All rights reserved. Data subject to change without notice.
cGas Detector Analog Transmitter - Installation Manual Rev. B | 2021.08
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.
© 2021 All rights reserved. Data subject to change without notice. 9
Rev. B | 2021.08 cGas Detector Analog Transmitter - Installation Manual
2 INTRODUCTION
2.1 General Description
Thank you for purchasing our CGAS-A analog cGas Detector, a single sensor, 4
- 20 mA transmitter available with a wide range of sensors and sensor types for
applications.
The CGAS-A transmitter is available with internal or remote sensor and operates
2.2 Key Features
• Single gas channel
• 4 - 20mA analog output (signals gas concentration reading)
• Easy Plug & Play Smart sensor replacement at end of life
• Pre-calibrated replacement sensors
• 24 volt DC or (ground referenced) AC power
•
• Bright LCD display
• Option -LT*: Low temperature package for improved usability in cold
environments
• Option -RHT**: Relative Humidity and Temperature sensor
•
• Option -S: Splash guard, factory installed, IP54 rated enclosure
• Option -SN: Splash guard for sticky gas sensors, factory installed
• Standard water / dust tight, corrosion resistant enclosure (drip proof)
10 © 2021 All rights reserved. Data subject to change without notice.
cGas Detector Analog Transmitter - Installation Manual Rev. B | 2021.08
• Copper coated interior to reduce RF interference
• RoHS compliant circuit boards
• Auto resetting fuse
NOTE:
*Option -LT is a low temperature package with OLED display and internal heater
for cold environment applications down to -40°C / -40°F. Available with all
**Option -RHT is an RH & Temperature sensor (oC or oF). Available with all
2, ClO2, HCI,
HCN, O3, PH3). The CGAS-A has one analog output which is used for gas
be locally displayed only.
***Option -RLY
2and sticky gas
sensors (Cl2, ClO2, HCI, HCN, O3, PH3).
Options -RHT and -RLY are both available with CGAS-A-CO only.
If after reading through the manual, you have any questions, please do not
hesitate to contact our service department for technical support.
© 2021 All rights reserved. Data subject to change without notice. 11
Rev. B | 2021.08 cGas Detector Analog Transmitter - Installation Manual
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
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)
USB Port Internal port for USB memory stick connection for
Push Buttons Initiate calibration and menu options with internal UP,
DOWN and ENTER push buttons
Audible Alarm none
12 © 2021 All rights reserved. Data subject to change without notice.
cGas Detector Analog Transmitter - Installation Manual Rev. B | 2021.08
ELECTRICAL
Power Requirement
16 - 30 VDC, 3 W, Class 2
24V recommended. Refer to Section 6.7 Wiring
Connections
Wiring 24 VDC or 24 VAC (ground referenced) 3-conductor
shielded 14-18 AWG stranded within conduit
Fuses Automatic resetting thermal
INPUT/OUTPUT
Analog Output One Linear 4 - 20 mA output, signals gas reading
RH & Temperature
(Option -RHT)
User selectable units (oC or oF), user selectable
display or hide readings
Relay
(Option -RLY)
1 SPDT dry contact relay, rated 30 volts @ 2 amps
(not available with CO2, CL2, CLO2, HCI, HCN, O3or
PH3
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
© 2021 All rights reserved. Data subject to change without notice. 13
Rev. B | 2021.08 cGas Detector Analog Transmitter - Installation Manual
CERTIFICATION
Model: CGAS-A-XXX
S/N: CGASA1807B00010
Rating: 16-30 VDC, 3W, 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 © 2021 All rights reserved. Data subject to change without notice.
cGas Detector Analog Transmitter - Installation Manual Rev. B | 2021.08
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
3) and Phosphine (PH3) order
the sticky gas splash guard Option -SN or use the metal splash guard
p/n: SCS-8000-WSG.
© 2021 All rights reserved. Data subject to change without notice. 15
Rev. B | 2021.08 cGas Detector Analog Transmitter - Installation Manual
4 SENSOR SPECIFICATIONS
4.1 Internal Gas Sensor Types
Internal Infrared Sensors Part Number Range Lifespan
2)
CGAS-A-CO2-5K 0 - 2,000 ppm
~ 8 yrsCGAS-A-CO2-5K 0 - 5,000 ppm
CGAS-A-CO2-5% 0 - 5% vol
Internal Electrochemical
Sensors Part Number Range Lifespan
Ammonia (NH3) CGAS-A-NH3 0 - 500 ppm ~2 yrs
CGAS-A-CO 0 - 200 ppm ~3 yrs
Chlorine (Cl2)CGAS-A-CL2 0 - 5.0 ppm ~3 yrs
CGAS-A-CL2-10 0 - 10 ppm ~3 yrs
2) CGAS-A-CLO2 0 - 1.0 ppm ~2 yrs
Ethylene (C2H4) * CGAS-A-C2H4 * 0 - 200 ppm ~2 yrs
LPT-A, LPT-B or LPT-M instead
Fluorine (F2) CGAS-A-F2 0 - 1.0 ppm ~1-2 yrs
Formaldehyde (CH2O) CGAS-A-CH2O 0 - 5.0 ppm ~2 yrs
Hydrogen (H2) CGAS-A-EH2 0 - 2,000 ppm ~2 yrs
Hydrogen Chloride (HCl) CGAS-A-HCL 0 - 30 ppm ~2 yrs
16 © 2021 All rights reserved. Data subject to change without notice.
cGas Detector Analog Transmitter - Installation Manual Rev. B | 2021.08
Hydrogen Cyanide (HCN) CGAS-A-HCN 0 - 30 ppm ~2 yrs
Hydrogen Fluoride (HF) CGAS-A-HF 0 - 10.0 ppm ~1-2 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
3) CGAS-A-O3 0 - 1.0 ppm ~2 yrs
Phosphine (PH3) CGAS-A-PH3 0 - 1.0 ppm ~2 yrs
Silane (SiH4) CGAS-A-SIH4 0 - 20 ppm ~2 yrs
2) CGAS-A-SO2 0 - 20 ppm ~2 yrs
Internal Solid State
Sensors
Part Number Range Lifespan
Refrigerant (R22) CGAS-A-SR22 0 - 2,000 ppm ~5 yrs
Refrigerant (R134A) CGAS-A-SR134A 0 - 2,000 ppm ~5 yrs
Refrigerant (R402A) CGAS-A-SR402A 0 - 2,000 ppm ~5 yrs
Refrigerant (R404A) CGAS-A-SR404A 0 - 2,000 ppm ~5 yrs
Refrigerant (R407C) CGAS-A-SR407C 0 - 2,000 ppm ~5 yrs
Refrigerant (R410A) CGAS-A-SR410A 0 - 2,000 ppm ~5 yrs
Refrigerant (R422D) CGAS-A-SR422D 0 - 2,000 ppm ~5 yrs
Refrigerant (R438A) CGAS-A-SR438A 0 - 2,000 ppm ~5 yrs
© 2021 All rights reserved. Data subject to change without notice. 17
Rev. B | 2021.08 cGas Detector Analog Transmitter - Installation Manual
Refrigerant (R507A) CGAS-A-SR507A 0 - 2,000 ppm ~5 yrs
Refrigerant (R513A) CGAS-A-SR513A 0 - 2,000 ppm ~5 yrs
Refrigerant (R514A) CGAS A-SR514A 0 - 2,000 ppm ~5 yrs
TVOC (Isobutylene) CGAS-A-STVOC 0 - 500 ppm ~5 yrs
Internal Catalytic
(Combustible) Sensors
Part Number Range Lifespan
Ethanol or Dimethyl Ether
(C2H6O)
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 (CH4O) 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
18 © 2021 All rights reserved. Data subject to change without notice.
cGas Detector Analog Transmitter - Installation Manual Rev. B | 2021.08
Internal RH & Temp
Sensor (no gas sensor) Part Number
Relative Humidity and
Temperature CGAS-A-RHT
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
© 2021 All rights reserved. Data subject to change without notice. 19
Rev. B | 2021.08 cGas Detector Analog Transmitter - Installation Manual
Remote PID Sensors Part Number Range
TVOCs ESH-A-SPL 0 - 30 ppm
ESH-A-SPH 0 - 300 ppm
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 NO2 sensors 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.
20 © 2021 All rights reserved. Data subject to change without notice.
cGas Detector Analog Transmitter - Installation Manual Rev. B | 2021.08
5 INSTRUMENT FEATURES
5.1 Exterior Enclosure
NUMBER FEATURE FUNCTION
Door Hinge Secures door to base and allows
easy opening and closing
Display LCD display (standard display
shown)
Sensor Opening Allows gas diffusion into sensor
Door Screw Secures door shut
Lock Slot For security padlock or tie
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