Carbon monoxide |
NO.1H |
| CO |  |
 |
Performance
| Measuring Range |
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| Number of Pump Strokes |
|
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| Correction Factor |
|
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| Sampling Time | 45 seconds per pump stroke | |||
| Detecting Limit | 0.02% (n=2) | |||
| Colour Change | White → Blackish brown | |||
| Reaction Principle | 5CO + I2O5 + H2S2O7 → I2 | |||
| Coefficient of Variation | 10% (for 0.2 to 1.0 %), 5% (for 1.0 to 5.0 %) | |||
| 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 | 0.3% | + | Blackish brown |
| Olefins | 2/3 time | + | Brown |
| Butane | 1% | + | Pale brown (whole layer) |
| Propane | 20% | + | No |
| Hexane | 0.3% | + | Pale brown (whole layer) |
| Calibration gas generation | High pressure gas cylinder method |
| TLV-TWA | TLV-STEL | Explosive range |
| 25 ppm | - | 12.5 to 74% |
