The CI 21 fixed transmitter from GfG Instrumentation, Ann Arbor, Mich., features a charge carrier injection sensor, designed to improve upon current ammonia refrigeration detection methods.

With CI 21 technology, sensor life is no longer limited to ammonia exposure levels, and is unaffected by exposure to high gas concentrations.

Charge carrier injection technology also eliminates false alarms frequently associated with metal oxide sensing (MOS).

GfG Instrumentation, Inc.