Gastec 4D Passive Dosl Tubes Hydrogen sulphide H2S (0.2 ~ 200 ppm)
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Indicator: 10~200ppm
Measuring Range: 0.2 to 200 ppm
Sampling Hours: 1 to 48 hours
Colour Change: White → Brown
Reaction Principle: H2S + Pb(CH3COO)2 → PbS + 2CH3COOH
Coefficient of Variation: 10% (for 10 to 200 ppm-hr)
Nr. of tests: 10
Details
Performance
| Measuring Range | 0.2 to 200 ppm |
| Sampling Hours | 1 to 48 hours |
| Detecting Limit | 0.2 ppm (10 hours) |
| Colour Change | White → Brown |
| Reaction Principle | H2S + Pb(CH3COO)2 → PbS + 2CH3COOH |
| Coefficient of Variation | 10% (for 10 to 200 ppm-hr) |
| 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 |
| Nitrogen dioxide | ｡� 5 ppm |  |
No |
| Ammonia | ｡� 25 ppm | No | No |
| Chlorine | ｡� 1 ppm | No | No |
| sulphur dioxide | ｡� 5 ppm | No | No |
| Calibration gas generation | Permeation tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 1 ppm | 5 ppm | 4.0 to 44% |
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