... . Anti-proof design ATEX diffusion type h2s gas detector for toxic gasThis Toxic gas detector with LED display and Remote control is ... fault detection .6.Explosion-proof design, it is suitable for II gas environment7.Adopts HBUS four buses communication mode ,power wire ... diffusion Detection Gas Combustible gas, VOC (Certain Organic Vapors),H2(ppm),CO,H2S,O2(VOL),NH3(ppm), Cl2,NO, CO2 Working condition ...