Sulfur dioxide SO2 NO.5LC


Performance

Measuring Range

 0.1 to 0.25 ppm (0.25) to 10 ppm 10 to 25 ppm

Number of Pump Strokes

 4 2 1

Correction Factor

 0.4 1 2.5

Sampling Time

2 minutes per pump stroke

Detecting Limit

0.02 ppm (n=4)

Color Change

Bluish purple White

Reaction Principle

Sulfur dioxide reacts with reaction agent to produce
intermediate product to discolor the reagent to white.
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.


Possible coexisting substances and their interferences (NOTE)

Substance

Concentration

Interference

Change color by itself

Nitrogen dioxide

 -

Minus error
(Unclear demarcation)

Produces brown stain of 1 mm
around inlet of the tube

Hydrogen sulfide

1/10

Plus error

Produce unclear demarcation
and white stain.


Calibration gas generation Permeation tube method


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

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