Gastec 71H Quick-measuring Detector tubes Methyl mercaptan CH3SH 1000 to 2700 ppm
ManufacturerGastec(View more products from this manufacturer)
Model71H
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Indicator: 20~1000ppm
Measuring Range:
+ 20 to 50 ppm, Number of Pump Strokes 2
+ 50 to 1000 ppm, Number of Pump Strokes 1
+ 1000 to 2700 ppm, Number of Pump Strokes 1/2
Sampling Time: 45 seconds per pump stroke
Colour Change: 1000 to 2700 ppm
Reaction Principle: 2CH3SH + PdSO4 → (CH3S)2Pd + H2SO4
Coefficient of Variation: 10% (for 50 to 200 ppm), 5% (for 200 to 1000 ppm)
Nr. of tests: 10
Pump: GV-100S/110S
Performance
| Measuring Range |
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| Number of Pump Strokes |
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| Correction Factor |
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| Sampling Time | 45 seconds per pump stroke | |||
| Detecting Limit | 2 ppm (n=2) | |||
| Colour Change | White → Yellow | |||
| Reaction Principle | 2CH3SH + PdSO4 → (CH3S)2Pd + H2SO4 | |||
| Coefficient of Variation | 10% (for 50 to 200 ppm), 5% (for 200 to 1000 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 |
| Carbon monoxide | No | No | |
| Nitrogen dioxide | No | No | |
| Hydrogen sulphide | 1000 ppm | + | No |
| Ethylene | No | No | |
| Mercaptans | + | Yellow |
Other substance measurable with this detector tube
| Substance | Correction Factor | No. of pump strokes | Measuring Range |
| Ethyl mercaptan | by scale | 1 | 100 to 3800 ppm |
| Calibration gas generation | Static gas dilution method |
| TLV-TWA | TLV-STEL | Explosive range |
| 0.5 ppm | - | 3.9 to 21.8% |
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