... ParameterCharacteristicsMeasuring gasCombustible gas, toxic and harmful gas, refer to lectotype table for detailsSampling MethodDiffusion, Pump samplingMeasurement principle of sensorElectrochemical (oxygen and poisonous ... gas), catalytic combustion (combustible gas)RangeRefer to lectotype table for detailsAlarm indication90dB variable sound vibration alarm, overrange, alarm against ...