Gastec 7LA Quick-measuring Detector tubes Phosphine PH3
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Indicator:
Measuring Range:
+ 0.05~0.1ppm, Number of Pump Strokes 10
+ 0.1~1.5 ppm, Number of Pump Strokes 5
+ 1.5~2.5ppm, Number of Pump Strokes 3
+ 2.5~9.8ppm, Number of Pump Strokes 1
Sampling Time: 1.5 minute per pump stroke
Colour Change: Yellow → Red
Reaction Principle: PH3 +3HgCl2 → P(HgCl)3 + 3HCl, HCl + Base → Chloride
Coefficient of Variation: 10% (for 0.1 to 0.4 ppm), 5% (for 0.4 to 1.5 ppm)
Nr. of tests: 10
Pump: GV-100S/110S
Performance
| Measuring Range |
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| Number of Pump Strokes |
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| Correction Factor |
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| Sampling Time | 1.5 minutes per pump stroke | ||||
| Detecting Limit | 0.02 ppm (n = 10) | ||||
| Colour Change | Yellow → Red | ||||
| Reaction Principle | PH3 +3HgCl2 → P(HgCl)3 + 3HCl HCl + Base → Chloride |
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| Coefficient of Variation | 10% (for 0.1 to 0.4 ppm), 5% (for 0.4 to 1.5 ppm) | ||||
| Shelf Life | 2 Years | ||||
| Corrections for temperature & humidity | Unnecessary | ||||
| Store the tubes at cool and dark place. | |||||
Possible coexisting substances and their interferences (NOTE)
| Substance | Concentration | Interference | Change colour by itself to |
| Arsine | 1/10 time | + | Red |
| Hydrogen chloride | No | No | |
| Diborane | No | No |
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