The CI21 Ammonia Gas Transmitter is a fixed NH3 detector from GfG designed for ammonia monitoring in refrigeration plants and other demanding industrial environments. It uses the Charge Carrier Injection (CI) sensor to deliver stable ammonia measurements with minimal cross-sensitivity, offering measurement ranges from a few parts per million up to 10,000 ppm and a 4–20 mA output signal. The unit operates on 10–30 V DC, is IP54-rated for protection against dust and water spray, and is built to perform in harsh conditions, including temperatures down to -40 °C.
