Carbon dioxide |
NO.2D |
| CO2 |
 |
Performance
| Measuring Range | 0.02 to 12% |
| Sampling Hours | 0.5 to 10 hours |
| Detecting Limit | 0.02 ppm (12 hours) |
| Colour Change | Pale Red → Yellow |
| Reaction Principle | CO2 + 2KOH → K2CO3 + H2O |
| Coefficient of Variation | 10% (for 0.2 to 8 %-hr) |
| Shelf Life | 2 Years |
| Corrections for temperature & humidity | Temperature correction is necessary |
| Store the tubes at cool and dark place. | |
Possible coexisting substances and their interferences (NOTE)
| Substance | Concentration | Interference | Change colour by itself to |
| Ammonia | 500 ppm | No | No ( 500ppm) |
| Hydrogen chloride | 300 ppm | No | No ( 300 ppm) |
| Chlorine | 10 ppm | No | No ( 5 ppm) |
| Hydrogen cyanide | 50 ppm | No | No ( 30 ppm) |
| sulphur dioxide | 15 ppm | No | No ( 15 ppm) |
| Nitrogen dioxide | 10 ppm | No | No ( 10 ppm) |
| Hydrogen sulphide | 50 ppm | No | No ( 30 ppm) |
| Calibration gas generation | High pressure gas cylinder method |
| TLV-TWA | TLV-STEL | Explosive range |
| 5000 ppm | 30000 ppm | - |