Water vapour |
NO.6LP |
| H2O |  |
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Performance
| Measuring Range |
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| Number of Pump Strokes |
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| Correction Factor |
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| Sampling Time | 1.5 minutes per pump stroke | ||
| Detecting Limit | 2 LB/MMCF (n=1) | ||
| Colour Change | Yellow → Green | ||
| Reaction Principle | H2O + Mg(ClO4)2 → Mg(ClO4)2  H2O |
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| Coefficient of Variation | 10% (for 3 to 10 LB/MMCF), 5% (for 10 to 40 LB/MMCF) | ||
| Shelf Life | 3 Years | ||
| Corrections for temperature & humidity | Temperature correction is necessary | ||
| Store the tubes at cool and dark place. | |||
| *(may become purple with high humidity) | |||
Possible coexisting substances and their interferences (NOTE)
| Substance | Concentration | Interference | Change colour by itself to |
| Sulphur dioxide | 15ppm | No | No |
| Nitrogen dioxide,Hydrogen sulphide | 30ppm | No | No |
| Hydrogen cyanide | 45ppm | No | No |
| Methyl ethyl ketone | 70ppm | No | No |
| Ethyl acetate | 100ppm | No | No |
| Acrylonitrile | 55ppm | No | No |
| Acetaldehyde | 50 ppm | No | No |
| Methanol | 100 ppm | + | Green |
| Triethylene glycol | No | No |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| - | - | - |
