Performance
| Measuring Range |
2.5 to 1000 ppm |
| Sampling Hours |
0.5 to10 hours |
| Detecting Limit |
0.5 ppm (10 hours) |
| Colour Change |
Purple → Yellow |
| Reaction Principle |
2NH3 + H2SO4 → (NH4)2SO4 |
| Coefficient of Variation |
10% (for 25 to 500 ppm-hr) |
| Shelf Life |
3 Years |
| Corrections for temperature & humidity |
Temperature 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 |
| Amines, Hydrazine |
|
+ |
Yellow |
| Aromatic amines |
|
No |
No |
Other substance measurable with this detector tube
| Substance |
Correction Factor |
Sampling Time |
Measuring Range |
| Dimethylamine |
0.75 |
0.5 to 10 hours |
1.9 to 750 ppm |
| N,N-Dimethylethylamine |
1.6 |
0.5 to 10 hours |
4 to 1600 ppm |
| Hydrazine |
0.65 |
0.5 to 10 hours |
1.6 to 650 ppm |
| Triethylamine |
2.1 |
0.5 to 10 hours |
5.3 to 2100 ppm |
| Calibration gas generation |
Permeation tube method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| 25 ppm |
35 ppm |
15 to 28% |
