Sulphur dioxide

 NO.5H
SO2
Performance
Measuring Range
0.05 to 0.5% 0.5 to 4.0% 4.0 to 8.0%
Number of Pump Strokes
2 to 10 1 1/2
Correction Factor
1/2 to 1/10 1 2
Sampling Time 1 minute per pump stroke
Detecting Limit 0.01% (n=10)
Colour Change Orange → Green
Reaction Principle SO2 + Cr6+→ Cr3+
Coefficient of Variation 10% (for 0.5 to 1 %), 5% (for 1 to 4 %)
Shelf Life 3 Years
Corrections for temperature & humidity Unnecessary
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   No No
Carbon dioxide   No No
Nitrogen dioxide   No No
Hydrogen sulphide 500 ppm + No
Calibration gas generation High pressure gas cylinder method
TLV-TWA TLV-STEL Explosive range
2 ppm 5 ppm -


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