Sulphur dioxide

NO.5M
SO2
Performance
Measuring Range
20 to 100 ppm 100 to 1800 ppm 1800 to 3600 ppm
Number of Pump Strokes
4 1 1/2
Correction Factor
1/5 1 2
Sampling Time 45 seconds per pump stroke
Detecting Limit 4 ppm (n=4)
Colour Change Purple → Yellow
Reaction Principle SO2 + BaCl2 +H2O BaSO3 + 2HCl
HCl+Base Chloride
Coefficient of Variation 10% (for 100 to 600 ppm), 5% (for 600 to 1800 ppm)
Shelf Life 3 Years
Corrections for temperature & humidity Temperature correction is necessary
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,
Nitric oxide
  No No
Carbon dioxide   No No
Nitrogen dioxide 1/10 + White ( 600ppm)
Hydrogen sulphide 10 times No
Calibration gas generation High pressure gas cylinder method
TLV-TWA TLV-STEL Explosive range
2 ppm 5 ppm -


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