Carbon monoxide |
NO.1LL |
| CO |  |
 |
Performance
| Measuring Range | 5 to 50 ppm |
| Number of Pump Strokes | 2 |
| Correction Factor | 1 |
| Sampling Time | 2 minutes per pump stroke |
| Detecting Limit | 1 ppm (n=2) |
| Colour Change | Yellow → Blackish brown |
| Reaction Principle | CO + Na2Pd(SO3)2 → Pd + CO2 + SO2 + Na2SO3 |
| Coefficient of Variation | 15% (for 5 to 10 ppm), 10% (for 10 to 50 ppm) |
| 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 |
| Acetylene | 1/50 time | + | Dark brown |
| sulphur dioxide | 1/10 time | + | Dark brown |
| Nitrogen dioxide | 40 ppm | + | Red |
| Hydrogen sulphidet | 1/5 time | + | Dark brown |
| Calibration gas generation | High pressure gas cylinder method |
| TLV-TWA | TLV-STEL | Explosive range |
| 25 ppm | - | 12.5 to 74% |
