Ammonia (NH3) Combustible Fixed Gas Detector (0-100ppm)The Ammonia NH3 Combustible Fixed Gas Detector (PX2 1 2 E1125 A 01) is designed for continuous monitoring of ammonia toxic gases between 0 100ppm and vapors in hazardous areas of zones 1 and 2. This detector is an explosion proof fixed NH3 gas detector, which measures between 0 100ppm. The detector also is based with a 4 20 mA RS485 Modbus output signal, alarm and fault relays (all SIL2 certified) for monitoring the ambient air to detect toxic gases.