Phosphine |
NO.7H |
| PH3 |  |
 |
Performance
| Measuring Range |
|
||
| Number of Pump Strokes |
|
||
| Correction Factor |
|
||
| Sampling Time | 1 minute per pump stroke | ||
| Detecting Limit | 5 ppm (n =1) | ||
| Colour Change | Yellow → Dark brown | ||
| Reaction Principle | Phosphine reacts with palladium to produce blackish discolouration | ||
| Coefficient of Variation | 10% (for 200 to 800 ppm), 5% (for 800 to 2500 ppm) | ||
| Shelf Life | 2 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 |
| Ammonia |  2500 ppm |
No | No |
| Carbon monoxide | + | Dark brown | |
| Carbon dioxide | 2% |
No | + |
| Calibration gas generation | High pressure gas cylinder method |
| TLV-TWA | TLV-STEL | Explosive range |
| 0.3 ppm | 1 ppm | - |
