Methanol |
NO.111 |
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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 | 0.0004% (n=4) | ||||
Colour Change | Pink → Pale blue | ||||
Reaction Principle | CH3OH + Cr6+ + H2SO4 → Cr3+ | ||||
Coefficient of Variation | 15% (for 0.02 to 0.5 %), 10% (for 0.5 to 1.5 %) | ||||
Shelf Life | 3 Years | ||||
Corrections for temperature & humidity | Temperature correction is necessary | ||||
Store the tubes at cool and dark place. |
Substance | Concentration | Interference | Change colour by itself to |
Alcohols | + | Pale blue | |
Carbon dioxide | No | No | |
Carbon monoxide | No | No | |
sulphur dioxide | No | No |
Calibration gas generation | Static gas dilution method |
TLV-TWA | TLV-STEL | Explosive range |
200 ppm | 250 ppm | 6 to 36% |