| NH3 |
 |
Performance
| Measuring Range |
| 10 to 50 ppm |
50 to 500 ppm |
500 to 1000 ppm |
|
| Number of Pump Strokes |
|
| Correction Factor |
|
| Sampling Time |
45 seconds per pump stroke |
| Detecting Limit |
2 ppm (n=5) |
| Colour Change |
Purple → Yellow |
| Reaction Principle |
3NH3 + H3PO4 → (NH4)3PO4 |
| Coefficient of Variation |
5% (for 50 to 500 ppm) |
| Shelf Life |
3 Years |
| Corrections for temperature & humidity |
Unnecessary |
| Store the tubes in dark and cool place. |
Possible coexisting substances and their interferences
(NOTE)
| Substance |
Concentration |
Interference |
Change colour by itself to |
| Diamines |
1/8 |
+ |
Yellow |
| Monoamines |
1/15 |
+ |
Yellow |
| Carbon dioxide |
1% |
 |
No |
Other substance measurable with this detector tube
| Substance |
Correction Factor |
No. of pump strokes |
Measuring Range |
| Trimethylamine |
0.5 |
1 |
25 to 250 ppm |
| Calibration gas generation |
Permeation tube method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| 25 ppm |
35 ppm |
15 to 28% |
