Gastec 4LK Quick-measuring Detector tubes Hydrogen sulphide H2S
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Indicator: 2 to 20 ppm
Measuring Range:
+ 1 to 2 ppm, Number of Pump Strokes 2
+ 2 to 20 ppm, Number of Pump Strokes 1
+ 20 to 40 ppm, Number of Pump Strokes 1/2
Sampling Time: 1 minute per pump stroke
Colour Change: White → Brown
Reaction Principle: H2S + Pb(CH3COO)2 → PbS + 2CH3COOH
Coefficient of Variation: 10% (for 2 to 6 ppm), 5% (for 6 to 20 ppm)
Nr. of tests: 10
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 | 0.25 ppm (n=2) | |||
| Colour Change | White → Brown | |||
| Reaction Principle | H2S + Pb(CH3COO)2 → PbS + 2CH3COOH | |||
| Coefficient of Variation | 10% (for 2 to 6 ppm), 5% (for 6 to 20 ppm) | |||
| 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 |
| Mercaptans | No | No | |
| sulphur dioxide | 1/2 | + | No |
| Nitrogen dioxide | 1/4 |  |
No |
| Ozone | 10 ppm | Bleaching | 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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