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发布时间：2010-12-20
174D CH2:CHCH:CH2 Performance Measuring Range 1.3 to 200 ppm Sampling Hours 1 to 8 hours Detecting Limit 1.3 ppm (8 hours) Color Change Reddish purple → Pale brown Reaction Principle CH2:CHCH:CH2 + MnO4 仺 Pale brown product Coefficient of Variation 10% (for 10 to 200 ppmr) Shelf Life 2 Year Corrections for temperature & humidity Temperature correction is necessary Store the tubes at cool and dark place. Possible coexisting substances and their interferences (NOTE) Substance Interference Change colour by itself to Unsaturated hydrocarbons + Pale brown Other substance measurable with this detector tube Substance Correction Factor Sampling Time Measuring Range Ethylene Factor: 1.2 1 to 10 1.5 to 240 ppm Vinyl chloride Factor: 1.2 1 to 10 1.5 to 240 ppm Isoprene Factor: 2.0 1 to 10 2.5 to 400 ppm Trans-1,2-Dichloroethylene Factor: 3.0 1 to 10 3.8 to 600 ppm Calibration gas generation Diffusion tube method TLV-TWA TLV-STEL Explosive range 2 ppm - 2.0 to 12%
