Nitric acid

Measuring Range
0.1 to 1 ppm 1 to 20 ppm 20 to 40 ppm
Number of Pump Strokes
2 to 10 1 1/2
Correction Factor
1/2 to 1/10 1 2
Sampling Time 45 seconds per pump stroke
Detecting Limit 0.05 ppm (n=10)
Colour Change Yellow →Reddish purple
Reaction Principle HNO3 + Indicator → Chemical reaction product
Coefficient of Variation 15% (for 1 to 5 ppm), 10% (for 5 to 20 ppm)
Shelf Life 3 Years
Corrections for temperature & humidity Humidity correction is necessary
Store the tubes at cool and dark place.
Possible coexisting substances and their interferences (NOTE)
Substance Concentration Interference Change colour by itself to
Hydrogen chloride 1/10 time + Reddish purple
Chlorine   No Breaches
Carbon monoxide   No No
Nitrogen dioxide   No No
Organic solvents   No No
Other substance measurable with this detector tube
Substance Correction Factor No. of pump strokes Measuring Range
Hydrogen bromide 0.8 1 0.8 to 16 ppm
Trichloroacetic acid by scale 1 1 to 37.5 ppm
Calibration gas generation High pressure gas cylinder method
TLV-TWA TLV-STEL Explosive range
2 ppm 4 ppm -

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