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Sulfur dioxide (SO2)
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(Price is for domestic US market only)
Sulfur dioxide (SO2)
Item Name:
Sulfur dioxide (SO2)
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Sulfur dioxide SO2 NO.5D



Measuring Range

0.2 to 100 ppm

Sampling Hours

1 to 10 hours

Detecting Limit

0.1ppm (10 hours)

Color Change

Green Yellow

Reaction Principle

Sulfur dioxide react with barium chloride to produce
hydrogen chloride to discolor the pH indicator to yellow.

Coefficient of Variation 10% (for 2 to 10 ppm¥hr),5% (for 10 to 100 ppm¥hr)
Shelf Life 3 Years
Corrections for
temperature & humidity
Store the tubes at cool and dark place.

Possible coexisting substances and their interferences (NOTE)




Change color by itself

Nitrogen dioxide


Minus error

No discoloration

Hydrogen sulfide


Plus error

No discoloration

Calibration gas generation Permeation tube method

TLV-TWA TLV-STEL Explosive range
2ppm 5ppm -

Range 0.2-100

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