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.
- 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
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 occupational exposure limit to ammonia.
NOTE: 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 |
| 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) |
| 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 |
Applications
Detected Gases
Configure Your cGas Detector Ammonia Vent Line Transmitter
Select options below to filter configurations.10 configurations available
Showing 1–10 of 10 configurations
CGAS-A-VLT-NH3-S
CGas Analog Ammonia (NH3) Transmitter (0 - 3% volume) w/ Splash Guard
CGAS-A-VLT-NH3-S-OD
CGas Analog Ammonia (NH3) Transmitter (0 - 3% volume) w/ Splash Guard, OLED Dis
CGAS-A-VLT-NH3-RLY-S
CGas Analog Ammonia (NH3) Transmitter (0 - 3% volume) w/ Splash Guard, Relay Op
CGAS-A-VLT-NH3-S-LT
CGas Analog Ammonia (NH3) Transmitter (0 - 3% volume) w/ Splash, Low Temp
CGAS-D-VLT-NH3-S
CGas Digital Ammonia (NH3) Transmitter (0 - 3% volume) w/ Splash Guard
CGAS-D-VLT-NH3-S-OD
CGas Digital Ammonia (NH3) Transmitter (0 - 3% volume) w/ Splash Guard, OLED Dis
CGAS-A-VLT-CCH4-100-RLY-S
CGas Vent Line Transm. Analog Methane(CH4) sensor (0-100% LEL) w/Splsh Grd & Rly
CGAS-A-VLT-CCH4-100-S
CGas Vent Line Transmitter Analog Methane (CH4) sensor (0-100% LEL) w/Splsh Grd
CGAS-SS-VLT-NH3
Smart Board (PID), with potted NH3 vent line sensor
VLT-NH3-SEN
VLT - NH3 Sensor Assembly
Not all configurations are listed here. Contact our sales team to discuss your specific requirements.
Documents
Ammonia Products Brochure
PDF • 4.2 MB • Brochures
Catalog
PDF • 1.1 MB • Brochures
Calibration Clip "Cal Clip" Datasheet
PDF • 127 KB • Datasheets
CGAS VLT Ammonia Vent Line Datasheet
PDF • 487 KB • Datasheets
Bump Testing Ammonia Sensors
PDF • 135 KB • Guidelines
Calibration with a Splash Guard (Option-S)
PDF • 1.2 MB • Guidelines
cGas Detector Ammonia Vent Line Transmitter Addendum
PDF • 1.1 MB • Manuals
cGas Detector Operation Manual - firmware v2.05 onwards
PDF • 634 KB • Manuals
cGas Detector Operation Manual - up to firmware v2.04
PDF • 1.3 MB • Manuals
Product Spec: CGAS-A-VLT-NH3-S Catalytic Ammonia Sensor
PDF • 118 KB • Product Specs
Product Spec: CGAS-D-VLT-NH3-S Catalytic Ammonia Sensor
PDF • 113 KB • Product Specs
ChillerSense Solution Guide
PDF • 2.7 MB • Compliance Guides
Video Library
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