sulphur dioxide |
NO.5D |
| SO2 |
 |
Performance
| Measuring Range | 0.2 to 100 ppm |
| Sampling Hours | 1 to 10 hours |
| Detecting Limit | 0.1 ppm (10 hours) |
| Colour Change | Green → Yellow |
| Reaction Principle | SO2 + BaCl2 + H2O BaSO3 + 2HCl HCl + Base Chloride |
| Coefficient of Variation | 10% (for 2 to 10 ppm-hr),5% (for 10 to 100 ppm-hr) |
| Shelf Life | 3 Years |
| Corrections for temperature & humidity | Unnecessary |
| Store the tubes at cool and dark place. | |
Possible coexisting substances and their interferences (NOTE)
| Substance | Concentration | Interference | Change colour by itself to |
| Nitrogen dioxide |  |
No | |
| Hydrogen sulphide | + | No |
| Calibration gas generation | Permeation tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 2 ppm | 5 ppm | - |