Ammonia |
NO.3LA |
| NH3 |  |
 |
Performance
| Measuring Range |
|
|||
| Number of Pump Strokes |
|
|||
| Correction Factor |
|
|||
| Sampling Time | 30 seconds per pump stroke | |||
| Detecting Limit | 0.5 ppm (n=2) | |||
| Colour Change | Purple → Yellow | |||
| Reaction Principle | 3NH3 + H3PO4 → (NH4)3PO4 | |||
| Coefficient of Variation | 10% (for 5 to 20 ppm), 5% (for 20 to 100 ppm) | |||
| 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 |
| Carbon dioxide | 1% |  |
No |
| Hydrazine | + | Yellow | |
| Amines | 1/15 | + | Yellow (5 ppm) |
| Calibration gas generation | Permeation tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 25 ppm | 35 ppm | 15 to 28% |
