| NO2 |
 |
Performance
| Measuring Range |
| 0.5 to 30 ppm |
30 to 125 ppm |
|
| Number of Pump Strokes |
|
| Correction Factor |
|
| Sampling Time |
1 minute per pump stroke |
| Detecting Limit |
0.1 ppm (n=2) |
| Colour Change |
White → Yellowish Orange |
| Reaction Principle |
NO2 + o-Tolidine Yellowish orange product |
| Coefficient of Variation |
10% (for 0.5 to 3 ppm), 5% (for 3 to 30 ppm) |
| Shelf Life |
3 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 colour by itself to |
| Ammonia |
|
No |
No |
| Carbon monoxide |
|
No |
No |
| Carbon dioxide |
|
No |
No |
| Nitric oxide |
50 ppm |
Unclear demarcation |
Pale red |
| Bromine, Chlorine |
1/5 times |
+ |
Yellowish orange |
| sulphur dioxide |
10 ppm |
 (Bleaching) |
No |
| Organic solvents |
|
No |
No |
Other substance measurable with this detector tube
| Substance |
Correction Factor |
No. of pump strokes |
Measuring Range |
| Iodine |
0.4 |
2 |
0.2 to 12 ppm |
| Calibration gas generation |
Permeation tube method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| 3 ppm |
5 ppm |
- |
