Acid gases

 NO.80
@
Performance
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)
Colour Change Pale reddish purple → Pale Yellow
Reaction Principle Acid gases react with detecting layer to produce yellow stain.
Coefficient of Variation 10% (for 2 to 40 ppm)
Shelf Life 2 Years
Corrections for temperature & humidity Unnecessary
Store the tubes in dark and cool place
Possible coexisting substances and their interferences (NOTE)
Substance Corrction No. of pump strokes Measuring Range (ppm)
Hydrogen chloride 4 2 4 to 320
Chlorine 0.35 2 0.35 to 28
Nitric acid 2.5 2 2.5 to 200
sulphur dioxide 0.75 2 0.75 to 60
Nitrogen dioxide 0.1 2 0.1 to 80
Iodine 0.06 2 0.06 to 48
Calibration gas generation Diffusion tube method
TLV-TWA TLV-STEL Explosive range
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