Gastec 76M Quick-measuring Detector tubes Tetrahydrothiophene C4H8S (10 ~ 100 mg/m^3)
ManufacturerGastec(View more products from this manufacturer)
Model76M
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Indicator: 10 ~ 100 mg/m^3
Measuring Range: 10 ~ 100 mg/m^3, Number of Pump Strokes 2
Sampling Time: 1 minute per pump stroke
Colour Change: Pink → Pale Yellow
Reaction Principle: C4H8S + MnO4 (Pink) → Pale Yellow Product
Coefficient of Variation: 10% (for 10 to 30 mg/m^3), 5% (for 30 to 100 mg/m^3)
Nr. of tests: 5
Pump: GV-100S/110S
Performance
| Measuring Range | 10 to 100 mg/m3 |
| Number of Pump Strokes | 2 |
| Correction Factor | 1 |
| Sampling Time | 1 minute per pump stroke |
| Detecting Limit | 2 mg/m3 (n=2) |
| Colour Change | Pink → Pale Yellow |
| Reaction Principle | C4H8S + MnO4 (Pink) → Pale Yellow Product |
| Coefficient of Variation | 10% (for 10 to 30 mg/m3), 5% (for 30 to 100 mg/m3) |
| Shelf Life | 2 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 |
| Ethyl mercaptan |  2 ppm |
No | Pale pink (whole layer) |
| Ethylene | 2000 ppm |
No | Pale pink (whole layer) |
| Propylene | 1000 ppm |
No | Pale pink (whole layer) |
| Methanol | 1000 ppm |
No | Pale pink (whole layer) |
| Hydrogen sulphide | 80 ppm |
No | Pale pink (whole layer) |
| 1-Butene | 1000 ppm |
No | Pale pink (whole layer) |
| tert-Butyl Mercaptan | 10 mg/m3 |
No | Pale pink (whole layer) |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| - | - | - |
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