PGas-21 toxic gas alarm: 1.it can detection of many kinds of toxic ... gas), catalytic combustion (combustible gas)RangeRefer to lectotype table for detailsAlarm indication90dB variable sound vibration alarm, overrange, alarm against insufficient quantity of electricityResponse time(CO ... , H2S, SO2, CL2, NO, CLO2, NO2<60s), (HCN, NH3, O3, HCl, C2H4O <160s), (PH3<100s), (combustible gas <30s ...