... Concentration 2.ExiaIICT3, 3.IP65 4.CE PGAS-21-NH3 for Ambient air in farms of chickens and pigs Intrinsically safe ... authentication Specifications ModelPGAS-21Measuring gasToxic gas (O2, CO, CL2, NH3, HCL, HCN, SO2 & etc)Sampling methodDiffusionMeasuring principleElectrochemical cellMeasuring rangeRefer to ordering ... dioxide 0-1 PPM 0.1 PPM PGAS-21-NH3 for Ambient air in farms of chickens and pigs