Gastec 71 Quick-measuring Detector tubes Methyl mercaptan CH3SH (0.25~140 ppm)
ManufacturerGastec(View more products from this manufacturer)
Model71
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Indicator: 5~70ppm
Measuring Range:
+ 0.25 to 2.5 ppm, Number of Pump Strokes 2 to 10
+ 2.5 to 70 ppm, Number of Pump Strokes 1
+ 70 to 140 ppm, Number of Pump Strokes 1/2
Sampling Time: 1.5 minute per pump stroke
Colour Change: White → Yellow
Reaction Principle: 2CH3SH + PdSO4 → (CH3S)2Pd + H2SO4
Coefficient of Variation: 10% (for 2.5 to 20 ppm), 5% (for 20 to 70 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 | 1.5 minutes per pump stroke | |||
| Detecting Limit | 0.1 ppm (n=10) | |||
| Colour Change | White → Yellow | |||
| Reaction Principle | 2CH3SH + PdSO4 → (CH3S)2Pd + H2SO4 | |||
| Coefficient of Variation | 10% (for 2.5 to 20 ppm), 5% (for 20 to 70 ppm) | |||
| Shelf Life | 3 Years | |||
| Corrections for temperature & humidity | Temperature correction is necessary | |||
| Store the tubes at cool and dark place. | ||||
Possible coexisting substances and their interferences (NOTE)
| Substance | Concentration | Interference | Change colour by itself to |
| Acetylene, Ethylene |  2000 ppm |
No(two layers) | Pale brown (whole layer) |
| Carbon Monoxide | 2000 ppm |
No(two layers) | Pale brown ( whole layer) |
| Other Mercaptans | + | Yellow | |
| Hydrogen sulphide | 500 ppm |
No | No |
| Calibration gas generation | Permeation tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 0.5 ppm(2014) | - | 3.9 to 21.8% |
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