Tetrahydrothiophene |
NO.76M |
| C4H8S |  |
 |
Performance
| Measuring Range | 10 to 100 mg/m3 |
| Number of Pump Strokes | 2 |
| Correction Factor | 1 |
| Sampling Time | 1.5 minutes 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 |
| - | - | - |
