1:for lpg, co, h2s gas etc 2:catalytic,electrochemical, pid sensor 3:Explosive-proof 4:ISO9001&CE 5:4~20mA output It ... -circuit of sensors, and automatic fault detection .3. Explosion -proof design, it is suitable for II gas environment.4. Adopts HBUS four ... %~93%RH(incondensable); pressure range:86~106kPa Cheaper combustible gas detector with real-time display