A charge carrier injection transmitter for ammonia gas detection, Model CI21 fromGfG-Dynamationis not affected by fluctuating humidity and temperature levels and does not require additional heaters. Sensor has a two-year life expectancy, and low cross sensitivity reduces the chance of false alarms. Unit operates on a 4 to 20 mA loop and is available in ranges up to 10,000 ppm for NH3.
January/February 2001, RS# 225