Phosphine |
NO.7H |
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Measuring Range |
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Number of Pump Strokes |
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Correction Factor |
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Sampling Time | 1 minutes 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. |
Substance | Concentration | Interference | Change colour by itself to |
Ammonia | ![]() |
No | No |
Carbon monoxide | + | Dark brown | |
Carbon dioxide | ![]() |
No | + |
Calibration gas generation | High pressure gas cylinder method |
TLV-TWA | TLV-STEL | Explosive range |
0.3 ppm | 1 ppm | - |