Continuous monitoring of ammonia or refrigerants in refrigeration applications

The food and beverage industry commonly relies on ammonia refrigeration to provide consumers high quality, edible food and cold drinks. An ammonia leak in a cold storage or freezer room can pose a serious health threat and result in spoiled food and other expensive losses.

Early detection of a refrigerant leak helps prevent dangerous health consequences to occupants, reduces significant loss of expensive refrigerant and decreases energy costs. If a leak does occur, a fixed gas detection system permanently installed near the chiller equipment in an area where a refrigerant leak is most likely to concentrate will ensure people will be alerted and kept safe.


Image: Typical Ammonia or Refrigerant Monitoring System



  • A life safety system with Ammonia gas detectors mounted above the potential leak area; Refrigerants and CO2 are mounted 6 in / 15 cm AFF​
  • Each chiller requires its own dedicated gas detector to monitor for loss of ammonia or refrigerant by leakage​
  • Outside the chiller room should be a Controller with a strobe and manual shut off switch to meet code requirements


  • Ammonia (NH3)​
  • Refrigerants​
  • Carbon Dioxide (CO2)



Single Chiller Application Double Chiller Application with Infrared Sensors Double Chiller Application with Solid State Sensors
Monitoring Ammonia in Cold Storage Room


FCS Multi Channel Controller
cGas-SC Self Contained Controller
CGAS IR Infrared Refrigerant Transmitter
CGAS-D Digital Transmitter
CGAS-A Analog Transmitter
RDM Remote Display Module



For many refrigeration applications, using solid state sensors will provide an economical and reliable gas detection solution. Solid state sensors are reliable if used in a clean area with very little temperature and humidity changes. Solid State refrigerant sensors should not be used where there are other chemicals or gases present (other than refrigerants), such as alcohol based cleaners, fumes from running engines, fuel storage containers, etc.

Infrared gas sensors are low maintenance and have a long life span. They provide the highest degree of sensor accuracy at low gas concentrations in areas where other contamination gases or multiple refrigerants exist in the same area. Infrared refrigerant sensors should not be used in locations that have corrosive chemicals such as chlorine, ammonia and other oxidizers that are present, especially if there is a higher humidity level.