Nitrogen oxides NO+NO2 NO.11HA


Performance

Measuring Range

50 to 2500 ppm

Number of Pump Strokes

1

Correction Factor

1

Sampling Time

1 minute per pump stroke

Detecting Limit

10 ppm (n=1)

Color Change

White Green

Reaction Principle

Nitrogen oxides is oxidised by nitrogen dioxide,
then react with diphenylamine to produce
p-nitroso-diphenylamine which color is green.
Coefficient of Variation 10% (for 50 to 400 ppm), 5% (for 400 to 2500 ppm)
Shelf Life 2 Years
Corrections for
temperature & humidity		 Unnecessary
Store the tubes at cool and dark place.


Possible coexisting substances and their interferences (NOTE)

Substance

Concentration

Interference

Change color by itself

Hydrogen chloride

500 ppm

Faint demarcation

Produce bluish purple
at 100 ppm

Ozone

200 ppm

Faint demarcation
two layers

Brown discoloration

Sulfur dioxide,
Hydrogen sulfide

 -

No effect

No discoloration


Calibration gas generation NO2:Permeation tube method
NO:High pressure gas cylinder method


TLV-TWA TLV-STEL Explosive range
NO2:3ppm
NO:25ppm		 NO2:5ppm -


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