Hydrogen sulphide, sulphur Dioxide |
NO.45S |
| H2S+SO2 (Separete quantification) |  |
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Performance
| 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. | |||||||
Possible coexisting substances and their interferences (NOTE)
| 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 : 1 ppm |
SO2 : 5 ppm H2S : 5 ppm |
H2S : 4.0 to 44% |
