Methanol |
NO.111LL |
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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 | 2 minutes per pump stroke | ||
Detecting Limit | 0.2 ppm (n=4) | ||
Colour Change | Pale yellow → Pale bluish green | ||
Reaction Principle | CH3OH + Cr6+ + H2SO4 → Cr3+ | ||
Coefficient of Variation | 15% (for 2 to 5 ppm), 10% (for 5 to 20 ppm) | ||
Shelf Life | 2 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 bluish green | |
Aromatic hydrocarbons | + | Pale bluish green |
Calibration gas generation | Diffusion tube method |
TLV-TWA | TLV-STEL | Explosive range |
200 ppm | 250 ppm | 6 to 36% |