Wall-mounted or pipe-type installation Apply to metallurgy, pharmacy, chemical industry, oil & gas industry etc. Auto-detectable to the O2, CO, H2S, H2, CL2, SO2, NO2, combistible gas and so on. Power: DC15-24V Output: 4~20mA signal Transmission range: ≤1000M Ex-mark: ExdIICT6 Apply to the operating or office enviroment for detecting the oxygen or any kind of toxic gas. Imported sensor with high stability. Fully featured with LED display and acoustic-optic alarm system. Intelligent design and simple operation of the zero adjustmen, alarming setting and calibration. Alarm relay can output the control signals. Can be available after power-on with a AC220Vpower supply. Sturdy and durable with its metal shell.