... of sensors, and automatic fault detection .6.Explosion-proof design, it is suitable for II gas environment7.Adopts HBUS four buses ... IP65Display mode LCD Alarm relay Normally open Gas Sample mode Natural diffusion Detection Gas Combustible gas, VOC (Certain Organic Vapors),H2( ... ppm),CO,H2S,O2(VOL),NH3(ppm), Cl2,NO, ...