In the past, the primary gases used in the refrigeration industry were ammonia and freon. Freon was found to deplete the ozone layer and was subsequently banned through an international treaty. The new refrigerants are generally designated as hydroflourocarbons (HFC). The lack of chlorine in these HFC gases make them more difficult to measure with gas detectors.
The ammonia and HFC gases (including AZ50) used in the refrigeration industry can be detected by solid state (SS) sensors, which have a much longer life than electro-chemical sensors. These SS sensors from PREI Instrumentation can be ranged 50 ppm to % by volume for ammonia, 1000 ppm for AZ50, and 1% by volume for HFC 134A.
The sensors have a life expectancy of 20 years. The protective sinter needs to be cleaned every three to 12 months, depending on the environment conditions. Monthly recalibration is recommended for safety. A variety of portable or permanently mounted transmitters are available for use with these sensors.
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