Carbon monoxide |
NO.1D |
| CO |
 |
Performance
| Measuring Range | 1.04 to 2000 ppm |
| Sampling Hours | 0.5 to 48 hours |
| Detecting Limit | 2 ppm (10 hours) |
| Colour Change | Pale Yellow → Brown |
| Reaction Principle | CO + Na2Pd(SO3)2 → Pd + CO2 + SO2 + Na2SO3 |
| Coefficient of Variation | 10% (for 50 to 1000 ppm-hr) |
| Shelf Life | 2 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 | 5 ppm |  |
No |
| Chlorine | No | No | |
| Hydrogen sulphide | + | Reddish brown |
| Calibration gas generation | High pressure gas cylinder method |
| TLV-TWA | TLV-STEL | Explosive range |
| 25 ppm | - | 12.5 to 74% |