... : Detecting Gasoxygen O2Measuring Range0-30%VOLSampling Methoddiffused or pump suction (external electric sampling pump)Deviation≤± 3% F.SRespond TimeT90 < 30 s ... Application: widely used in Metallurgy, petrochemical industry, coal mine, papermaking, fire-fighting, municipal affairs, pharmacy, power plant, chemical industry, mine, tunnel, underground ...