cGas Detector Ammonia Vent Line Transmitter

For continuous monitoring of Ammonia levels in the vent line of refrigeration systems

Mount indoors on the ammonia vent relief stack in refrigeration systems to help detect equipment failure

Applications

Ice Arenas
Refrigeration Plants
Cold Storage Rooms
Freezer Rooms
Ammonia Plants
and many more...

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Key Features

Single channel, internal catalytic Ammonia sensor
4-20 mA analog output or user configurable in the field, BACnet® MS/TP (version 1 rev 14) RS-485 or Modbus® RTU (version 1.1b3) RS-485
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 configuration changes and firmware upgrades
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

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.

With the optional relay, it can be configured to send an analog signal to the controller or PLC to activate the emergency ventilation system or shut down the equipment depending on the level of alarm.

Powered by 24 VDC or ground referenced AC, the CGAS Detector has an LCD display and the firmware and configuration can be upgraded in the field using the USB connection. The Plug & Play Smart Sensor comes pre-calibrated and is easy to replace.

It comes standard with a water / dust tight, corrosion resistant ABS / polycarbonate enclosure with a hinged, secured door. A factory installed splash guard protects the device against water ingress.

NOTE: This device is not designed to monitor ammonia in applications requiring human health safety levels detection. The lowest reading the sensor will detect is above the recommended exposure limit to ammonia. A large release of a high concentration of ammonia may burn out the sensor and it will require replacement.

Specifications

Target Gas

Gas Sensor

Ammonia (NH3), measurement range 0 - 3.00% volume

Tolerant to 17% volume. NOTE: Ammonia is flammable between 15% (LEL) and 28% (UEL) volume in air.

Sensor

Type

Catalytic

Response Time T90

30 seconds

Mechanical

Enclosure

Black ABS / Polycarbonate, copper coated interior to reduce RF interference
IP54 rated with splash guard installed

Weight

825 g / 29 oz

Size

Detector with splash guard: 127 x 127 x 84 mm / 5.0 x 5.0 x 3.3 in
Completely assembled product: 127 x 127 x 182.5 mm / 5.0 x 5.0 x 7.18 in

Coupler

19.5 mm / 3/4 inch NPT, cast steel

Sensor Assembly Length (including coupler)

98.5 mm / 3.875 inches

User Interface

Display (Standard)

2-line by 16 character graphic LCD
Operating Temperature: 0°C to 40°C / 32°F to 104°F

Display (Option -LT)

2-line by 16 character OLED display and internal heater
Operating Temperature: -40°C to 40°C / -40°F to 104°F

Push Buttons

Initiate calibration and menu options with internal UP, DOWN and ENTER push buttons

USB Port

Internal port for USB memory stick for field configuration updated / firmware upgrades

Input/Output

Analog (CGAS-A-VLT model)

Linear 4 - 20 mA analog
Maximum 216 ohm load (wiring plus termination resistor) @ 12 VDC
Maximum 316 ohm load (wiring plus termination resistor) @ 12 VAC

Digital (CGAS-D-VLT Model)

User configurable in the field, BACnet® MS/TP (version 1 rev 14) RS-485 or Modbus® RTU (version 1.1b3) RS-485

Relay (Option -RLY)

1 SPDT dry contact relay, rated 30 volts @ 2 amps

Electrical

Power Requirement

3-wire: 16-30 VDC, 3W, Class 2
4-wire: 12-27 VAC, 50-60 Hz, 3 VA, Class 2
24V recommended

Wiring (CGAS-A-VLT model)

VDC (or ground referenced AC): 3-conductor 18 AWG (or larger) shielded, stranded within conduit
VAC 4-conductor shielded 18 AWG stranded within conduit

Wiring (CGAS-D-VLT Model)

VDC or VAC (ground referenced) 4-conductor shielded 16 AWG stranded within conduit, network wiring (daisy-chain)

Fuses

Automatic resetting thermal

Environmental

Operating Temperature

0°C to 40°C (32°F to 104°F), temperatures below 0°C / 32°F require Option-LT

Operating Humidity

15 - 80% RH non-condensing

Certifications

Conforms to

CSA-C22.2 No. 205-12, UL508 (Edition 18):2018

EMC Directive 2014/30/EU, EN 50270:2015, Type 1, EN61010

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.

RoHS compliant circuit boards

Product Codes

CGAS-A-VLT-NH3-S

Catalytic ammonia (NH3) sensor (0 - 3.00% volume range), LCD display, one analog 4-20 mA output, Plug & Play Smart sensor replacement, water / dust tight enclosure rated IP54 with splash guard; power coated cast steel sensor assembly and coupler for mounting on ammonia vent relief stack

CGAS-D-VLT-NH3-S

Catalytic ammonia (NH3) sensor (0 - 3.00% volume range), LCD display, field configurable Modbus® RTU RS-485 or BACnet® MS/TP output, Plug & Play Smart sensor replacement, water / dust tight enclosure rated IP54 with splash guard; power coated cast steel sensor assembly and coupler for mounting on ammonia vent relief stack

Factory Options

-LT

Low temperature package with OLED display and internal heater for cold environment applications down to -40°C / -40°F

-RLY

1 SPDT dry contact relay, rated 30 volts, 2 amps max