|
|
| Nitrogen dioxide |
NO2 |
NO.9D |
| Performance |
Measuring
Range
|
0.1 to 30 ppm |
Sampling Hours
|
1 to 10 hours |
Detecting Limit
|
0.05 ppm (10 hours) |
Color Change
|
White ---> Yellow |
| Reaction
Principle |
Nitrogen dioxide
oxidizes o-toluidine for form yellow color stain.
NO2 + o-Toluidine ---> Yellow product |
| Coefficient
of Variation |
10% (for 1 to 30
ppm-hr) |
| Shelf
Life |
1 Years |
| Corrections
for temperature & humidity |
Temperature correction
is necessary |
| Store the
tubes in the refrigerator to keep at 10oC (50oF) or below. |
| Possible
coexisting substances and their interferences |
Substance
|
Concentration
|
Interference |
Change
color by itself |
Bromine,Chlorine
|
-
|
Plus error
|
Discolor yellow
stain |
Ammonia
Carbon
monoxiide
Nitric oxide
Sulfur dioxide
Organic
vapor
|
- |
No effect
|
No discoloration |
| Calibration
gas generation |
Permeation tube method |
TLV-TWA
|
TLV-STEL
|
Explosive
range |
| 3ppm |
5ppm |
- |
|
