Oxygen |
NO.31B |
| O2 |  |
 |
Performance
| Measuring Range |
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| Number of Pump Strokes |
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| Correction Factor |
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| Sampling Time | 2 minutes per pump stroke | ||
| Detecting Limit | 2% (n=1) | ||
| Colour Change | Black → White | ||
| Reaction Principle | O2 + 4TiCl3 + 6H2O → 4TiO2 + 12HCl | ||
| Coefficient of Variation | 5% (for 6 to 24 %) | ||
| 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 |
| Carbon monoxide | No | No | |
| Carbon dioxide | 40% | + | No |
| Note: If more than 40% carbon dioxide is coexisted, the tube reading will be 1% higher than the true concentration. (At 21% oxygen concentration tube 31B indicates 22%.) |
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| Calibration gas generation | Dynamic gas dilution method |
| TLV-TWA | TLV-STEL | Explosive range |
| - | - | - |
