Gastec 76H Quick-measuring Detector tubes Tetrahydrothiophene C4H8S
ManufacturerGastec(View more products from this manufacturer)
Model76H
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Indicator: 10 to 200 ppm
Measuring Range: 10 to 200 ppm, Number of Pump Strokes 1
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 60 ppm), 5% (for 60 to 200 ppm)
Nr. of tests: 5
Pump: GV-100S/110S
Performance
| Measuring Range | 10 to 200 ppm |
| Number of Pump Strokes | 1 |
| Correction Factor | 1 |
| Sampling Time | 1 minute per pump stroke |
| Detecting Limit | 2 ppm (n=1) |
| Colour Change | Pink → Pale Yellow |
| Reaction Principle | C4H8S + MnO4 (Pink) → Pale Yellow Product |
| Coefficient of Variation | 10% (for 10 to 60 ppm), 5% (for 60 to 200 ppm) |
| 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 |  3 ppm |
No | Pale pink (whole layer) |
| Ethylene | 5000 ppm |
No | Pale pink (whole layer) |
| Propylene | 2000 ppm |
No | Pale pink (whole layer) |
| Methanol | 2000 ppm |
No | Pale pink (whole layer) |
| Hydrogen sulphide | 300 ppm |
No | Pale pink (whole layer) |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| - | - | - |
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