Nitrogen oxides NO2,NO(Separete quantification) NO.10


Performance

Name of Gas

Nitrogen Dioxide (NO2)

Nitric oxide (NO)

Measuring Range

2.5 to 200 ppm

2.5 to 5 ppm

5 to 200 ppm

Pump Strokes

1

2

1

Correction Factor

1

1/2

1

Sampling Time

1 minute per pump stroke

Detecting Limit

0.5 ppm (n=1)

1 ppm (n=2)

Color Change

White Yellowish orange
Reaction Formula

NO2 tube: Nitrogen dioxide reacts with o-tolidine
to produce yellowish orange stain.

NO tube: Nitric oxide reacts with acid to produce acid gas
and acid gas react with o-tolidine to produce yellowish orange stain.
Coefficient of Variation

NO2 tube: 10% (for 2.5 to 20 ppm), 5% (for 20 to 200 ppm)
NO tube:10% (for 5 to 20 ppm), 5% (for 20 to 200 ppm)
Shelf Life 3 Years
Corrections for
temperature & humidity		 NO2 tube:Unnecessary
NO tube:Temperature correction is necessary
Store the tubes at cool and dark place.


Possible coexisting substances and their interferences (NOTE)
For the NO2 tube

Substance

Concentration

Interference

Change color by itself

Nitrogen monoxide

 -

No effect

Produce red belt at demarcation

Hydrogen chloride

 -

Unclear demarcation

No discoloration

Ozone, Halogens,
Chlorine dioxide

1/5

20% Plus error

Produce yellowish orange stain

Sulfur dioxide

50 ppm

Unclear demarcation

No discoloration


For the NO tube

Substance

Concentration

Interference

Change color by itself

Hydrogen chloride

 -

No effect

No discoloration

Ozone, Halogens, Chlorine dioxide

 -

No effect

No discoloration

Sulfur dioxide

 -

No effect

No discoloration

Nitrogen dioxide

 -

No effect

No discoloration


Calibration gas generation Permeation tube method


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


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