Hydrogen sulphide, sulphur Dioxide |
NO.45S |
Name of Gas |
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Measuring Range |
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Number of Pump Strokes |
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Correction Factor |
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Sampling Time | 1.5 minute per pump stroke | ||||||
Detecting Limit | 0.05 ppm (n=2) | ||||||
Colour Change | SO2tube : Yellowish green → Yellow H2S tube : White → Brown |
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Reaction Principle | SO2tube: SO2 + BaCl2+ H2O → BaSO3 + 2HCl HCl + Base → Chloride H2S tube: H2S + Pb(CH3COO)2 → PbS + 2CH3COOH |
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Coefficient of Variation | SO2 tube: 10% (for 0.5 to 2 ppm), 5% (for 2 to 10 ppm) H2S tube:10% (for 2.5 to 10 ppm), 5% (for 10 to 60 ppm) |
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Shelf Life | 3 Years | ||||||
Corrections for temperature & humidity | Unnecessary | ||||||
Store the tubes at cool and dark place. |
Substance | Concentration | Interference | Change colour by itself to | ||
SO2 tube | H2S tube | SO2 tube | H2S tube |
Nitrogen dioxide | 5 ppm | + | No | Pale purple | No |
Nitrogen monoxide Mercaptans Carabon monoxide |
No | No | No |
Calibration gas generation | Permeation tube method |
TLV-TWA | TLV-STEL | Explosive range |
SO2 : 2 ppm H2S : 10 ppm |
SO2 : 5 ppm H2S : 15 ppm |
H2S : 4.0 to 44% |