Hydrogen sulphide |
NO.4LB |
| H2S |  |
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Performance
| Measuring Range |
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| Number of Pump Strokes |
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| Correction Factor |
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| Sampling Time | 1 minute per pump stroke | |||
| Detecting Limit | 0.1 ppm (n=2) | |||
| Colour Change | Pale Yellow → Pink | |||
| Reaction Principle | H2S + HgCl2 → HSHgCl + HCl |
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| Coefficient of Variation | 10% (for 1 to 2 ppm), 5% (for 2 to 6 ppm) | |||
| Shelf Life | 2 Years | |||
| Corrections for temperature & humidity | Unnecessary |
Possible coexisting substances and their interferences (NOTE)
| Substance | Concentration | Interference | Change colour by itself to |
| Ammonia | No | No | |
| sulphur dioxide | No | No | |
| Mercaptans | + | Pink |
| Calibration gas generation | Permeation tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 1 ppm | 5 ppm | 4.0 to 44% |
