... widely used in petroleum, petrochemistry, chemical industry, gas, coal, metallurgy and power system; safety detection in ... principle of sensorElectrochemical (oxygen and poisonous gas), catalytic combustion (combustible gas)RangeRefer to lectotype table for detailsAlarm indication90dB ... O3,HCl, C2H4O <160s), (PH3<100s), (combustible gas <30s) Detection error±5%F.SOperation modeTouch push-keyDisplay ...