Indicator: 0.2~6%
Measuring Range: 0.02 ~12%
Sampling Hours: 0.5 to 10
Colour Change: Pale Red → Yellow
Reaction Principle: CO2 + 2KOH → K2CO3 + H2O
Coefficient of Variation: 10% (for 0.2 to 6.0 %-hr)
Nr. of tests: 10
Detail
Performance
| Measuring Range | 0.02 to 12% |
| Sampling Hours | 0.5 to 10 hours |
| Colour Change | Pale Red → Yellow |
| Reaction Principle | CO2 + 2KOH → K2CO3 + H2O |
| Coefficient of Variation | 10% (for 0.2 to 6.0 %-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 (2014) | 30000 ppm (2014) | - |
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