... Gas Detector OverviewThe Ex HK-7200A ToxicGas Detector, based on electrochemical principle, is designed for continuous detecting ... displayAdvanced electrochemistry sensor--- stable, ... alarm available SpecificationDisplayLEDIt shows concentration ,high alarm, low alarm and fault alarmMeasurementToxic GasesPrincipleElectrochemicalSample MethodDiffusionMeasurementO2 , CO, H2S, H2, Cl2, SO2 and other toxic ...