Measuring Range

1 to 2 ppm

2 to 40 ppm

40 to 80 ppm

Number of Pump Strokes

4

2

1

Correction Factor

1/2

1

2

Sampling Time

45 seconds per pump stroke

Detecting Limit

0.5 ppm (n=4)

Color Change

Pale reddish purple Pale Yellow

Reaction Principle

Acid gases react with detecting layer to produce yellow stain.

Substance

Correction

Pump
strokes

Color Change

Measuring range

Hydrogen chloride

4

2

Pale reddish purple

4 to 320 ppm

Chlorine

0.35

2

White

0.35 to 28 ppm

Nitric acid

2.5

2

Pale reddish purple

2.5 to 200 ppm

Sulfur dioxide

0.75

2

Yellow

0.75 to 60 ppm

Nitrogen dioxide

0.1

2

Pinkish gray

0.1 to 80 ppm

Iodine

0.06

2

Light bluish gray

0.06 to 48 ppm