Model GDX-350 can detect toxic, combustible and asphyxiate gases such as ammonia, carbon monoxide, oxygen, hydrogen sulfide, sulfur dioxide, combustible gases, hydrogen and phosphine (NH3, CO, O2, H2S, SO2, NO2, H2 and PH3-using electrochemical sensors. Wireless connectivity, real-time monitoring and rugged construction provide flexible operation directly in hazardous-rated areas of industrial environments. An optional relay board provides three 5 A relays that can be used to drive audible and visual alarms or to activate exhaust fans. The proprietary Smart Sensor technology allows the precalibrated plug-and-play sensors to be replaced by the user.