汽油检测管101 CnHm Gasoline

汽油检测管101 CnHm Gasoline Gasoline?????? ??????????No.101 CnHm Performance ? Measuring Range 0.015 to 0.03% 0.03 to 0.6% 0.6 to 1.2% Number of Pump Strokes 2 1 1/2 Correction Factor 1/2 1 2 Sampling Time 1 minute per pump stroke Detecting Limit 0.003% (n = 2) Color Change Orange → Dark green Reaction Principle CnHm + Cr6++ H2SO4 → Cr3+ Coefficient of Variation 10% (for 0.03 to 0.1 %), 5% (for 0.1 to 0.6 %) Shelf Life 3 Years Corrections for temperature & humidity Unnecessary Store the tubes at cool and dark place. ? Possible coexisting substances and their interferences (NOTE) Substance Concentration Interference Change color by itself Acetylene 3% Yes Produce dark brown to whole layer Propane 0.2% Yes Produce dark brown to whole layer (2%) Aromatic HCs 500 ppm Plus error Produce dark green (5000ppm) Alcohols, Esters, Ethers - Plus error Produce dark green Halogenated HCs. 5000 ppm Plus error Produce dark green (5000ppm) Hydrogen sulfide 500 ppm Plus error Produce dark green (5000ppm) Sulfur dioxide 500 ppm Plus error Produce green (5000ppm) Other substance measurable with this detector tube Substance Correction No. of Pump Strokes Measuring Range Heptane Factor: 1.0 1/2, 1 or 2 0.015 to 1.2% Isooctane Factor: 0.9 1 0.027 to 0.54% Octane Factor: 1.2 1 0.036 to 0.72% Calibration gas generation Static gas dilution method ? TLV-TWA TLV-STEL Explosive range 300ppm 500ppm 1.4 to 7.6% ?

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