Gastec 72 Quick-measuring Detector tubes Ethyl mercaptan C2H5SH (0.5-120ppm)
ManufacturerGastec(View more products from this manufacturer)
Model72
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Indicator: 5 to 120 ppm
Measuring Range:
+ 0.5 to 5 ppm, Number of Pump Strokes 2 to 10
+ 5 to 120 ppm, Number of Pump Strokes 1
Sampling Time: 2 minute per pump stroke
Colour Change: White → Yellow
Reaction Principle: 2C2H5SH + PdSO4 → (C2H5S)2Pd+ H2SO4
Coefficient of Variation: 10% (for 5 to 40 ppm), 5% (for 40 to 120 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 | 2 minutes per pump stroke | ||
| Detecting Limit | 0.2 ppm (n=10) | ||
| Colour Change | White → Yellow | ||
| Reaction Principle | 2C2H5SH + PdSO4 → (C2H5S)2Pd+ H2SO4 | ||
| Coefficient of Variation | 10% (for 5 to 40 ppm), 5% (for 40 to 120 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 |
+ | Pale brown (whole layer) |
| Carbon Monoxide | 2000 ppm |
+ | Pale brown (whole layer) |
| Other Mercaptans | + | Yellow | |
| Hydrogen sulphide | 500 ppm |
+ | No |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 0.5 ppm(2014) | - | 2.8 to 18.2% |
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