1:Gas detectors with lcd 2:Imported sensor 3:ISO9001:2008 4:explosion-proof ... PIDGas Sample modeNatural diffusionCommunication mode4~20mA Working voltage DC14V~35V( detector terminal) Install screw thread G 3/4" internal thread ... Gas Combustible gas, VOC (Certain Organic Vapors), H2(ppm), CO,H2S,O2(VOL),NH3 ppm),Cl2,NO,SO2 Working condition ... range:86~106kPa explosion-proof fixed gas detectors with LCD