Tetrahydrothiophene |
NO.76H |
| C4H8S |  |
 |
Performance
| Measuring Range | 10 to 200 ppm |
| Number of Pump Strokes | 1 |
| Correction Factor | 1 |
| Sampling Time | 1.5 minutes 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 80 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 |
| - | - | - |
