Carbon monoxide |
NO.1LKC |
| CO |  |
 |
Performance
| Measuring Range | 5 to 100 ppm |
| Number of Pump Strokes | 3 |
| Correction Factor | 1 |
| Sampling Time | 2 minutes per pump stroke |
| Detecting Limit | 2 ppm (n=3) |
| Colour Change | White → Pale brown / Pale green (may produce dual layers) |
| Reaction Principle | 5CO + I2O5 + H2S2O7 → I2 |
| Coefficient of Variation | 5% (for 5 to 100 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 |
| Hydrogen |  10% |
 15% |
No discoloration |
| Paraffinic hydrogen C6 or less (RH0%) |  15% |
No | Pale brown when higher than 15% |
| Ethylene(RH0%) | 2% |
No | Pale brown when higher than 3% |
| Propylene(RH0%) | 15% |
No | Pale brown when higher than 15% |
| Acetylene(RH0%) | 200ppm |
No | Pale brown when higher than 250ppm |
| Carbon dioxide,Nitrogen oxides | No | No discoloration | |
| Hydrogen sulphide | No | No discoloration |
| Calibration gas generation | High pressure gas cylinder method |
| TLV-TWA | TLV-STEL | Explosive range |
| 25 ppm | - | 12.5 to 74% |
