Tetrahydrothiophene |
NO.76 |
| C4H8S |  |
 |
Performance
| Measuring Range | 1 to 10 ppm |
| Number of Pump Strokes | 4 |
| Correction Factor | 1 |
| Sampling Time | 45 seconds per pump stroke |
| Detecting Limit | 0.25 ppm (n=4) |
| Colour Change | Pink → Pale Yellow |
| Reaction Principle | C4H8S + MnO4 (Pink) → Pale Yellow Product |
| Coefficient of Variation | 10% (for 1 to 3 ppm), 5% (for 3 to 10 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 | ¡å 1 ppm | No | Pale pink (whole layer) |
| Ethylene | ¡å 1000 ppm | No | Pale pink (whole layer) |
| Propylene | ¡å 500 ppm | No | Pale pink (whole layer) |
| Methanol | ¡å 300 ppm | No | Pale pink (whole layer) |
| Hydrogen sulphide | ¡å 30 ppm | No | Pale pink (whole layer) |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| - | - | - |
