Sulphur dioxide |
NO.5LC |
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 | 0.02 ppm (n=4) | |||
Colour Change | Bluish purple → White | |||
Reaction Principle | SO2 +I2 +2H2O H2SO4 + 2HCl | |||
Coefficient of Variation | 10% (for 0.25 to 2 ppm), 5% (for 2 to 10 ppm) | |||
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 |
Nitrogen dioxide | (Unclear demarcation) |
Brown (approx.1mm long from the inlet) | |
Hydrogen sulphide | 1/10 | + | White |
Calibration gas generation | Permeation tube method |
TLV-TWA | TLV-STEL | Explosive range |
2 ppm | 5 ppm | - |