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cGas Ammonia Vent Line Transmitter - Addendum Rev. B | 2022.09
4 © 2022 All rights reserved. Data subject to change without notice.
1 INTRODUCTION
1.1 General Description
The cGas Ammonia Vent Line Detector is designed for continuous monitoring of ammonia
levels in the vent line of refrigeration systems, including the detection of equipment failure in
ammonia plant vent stack applications.
Using a a ¾” cast steel coupler, the cGas Ammonia Vent Line Detector is to be mounted
indoors on the ammonia vent relief stack above the pressure relief valve.
IMPORTANT: The cGas Ammonia Vent Line Detector is NOT designed to monitor ammonia
in applications requiring human health safety levels detection and is not designed to protect
people from toxic gas concentrations. The lowest reading the sensor will detect is above the
recommended exposure limit to ammonia.
NOTE: CET manufactures other ammonia gas detectors that meet human health safety
levels, if that is the required application. If you have any questions, please do not hesitate to
contact our service department for technical support.
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).
The cGas Ammonia Vent Line Detector is not intended for use in hazardous rated areas.
If after reading through the manual, you have any questions, please do not hesitate to
contact our service department for technical support.
1.2 Key Features
• Single channel, internal catalytic Ammonia sensor
• 4-20 mA output (CGAS-A-VLT model)
• Field congurable BACnet® MS/TP RS-485 or Modbus® RTU RS-485 digital output
signal (CGAS-D-VLT model)
• 24 VDC or VAC power (ground referenced)
• Easy Plug & Play Smart Sensor replacement at end of life, comes pre-calibrated
• Bright LCD display
• USB port for conguration changes and rmware upgrades
• 1 optional 2A SPDT dry contact relay (Option -RLY)
• Optional low temperature operation package (Option -LT)
• Standard water / dust tight, corrosion resistant enclosure (drip proof)
• Thermal resetting fuses
• RoHS compliant circuit board