Nitrogen dioxide |
NO.9D |
| NO2 |
 |
Performance
| Measuring Range | 0.1 to 30 ppm |
| Sampling Hours | 1 to 10 hours |
| Detecting Limit | 0.05 ppm (10 hours) |
| Colour Change | White → Yellow |
| Reaction Principle | NO2 + o-Toluidine → Yellow product |
| Coefficient of Variation | 10% (for 1 to 30 ppm-hr) |
| Shelf Life | 1 Year |
| Corrections for temperature & humidity | Temperature correction is necessary |
| Store the tubes in the refrigerator to keep at 10ºC (50ºF) or below. | |
Possible coexisting substances and their interferences (NOTE)
| Substance | Concentration | Interference | Change colour by itself to |
| Bromine,Chlorine | + | Yellow | |
| Ammonia Carbon monoxide Nitric oxide sulphur dioxide Organic gases and vapour |
No | No |
| Calibration gas generation | Permeation tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 3 ppm | 5 ppm | - |