Phosphine (PH3) Detection Tubes (200 to 5500 ppm)
Gastec Detection Tube No. 7H measures Phosphine with a Range of 200 to 5500 ppm.
- Measuring Range: 200 to 2500 ppm, 2500 to 5500 ppm
- Number of Pump Strokes: 1, 1/2
- Correction Factor: 1, 2.2
- Sampling Time: 1 minute per pump stroke
- Detecting Limit: 5 ppm (1 pump stroke)
- Changes from Yellow to Blackish brown
- Corrections for temperature & humidity: Temperature correction is necessary
- Reaction Principle: PH3 + Na2Pd (SO3)2 ➝ Pd
- Relative Standard Deviation: 10% (for 200 to 800 ppm), 5% (for 800 to 2500 ppm)
- 2 Year Shelf Life
- Store the tubes at cool and dark place.
Possible coexisting substances and their interferences:
| Substance |
Concentration |
Interference |
Changes color by itself to |
| Ammonia |
≦ 2500 ppm |
No |
No |
| Carbon monoxide |
|
+ |
Blackish brown from 5 ppm |
| Carbon dioxide |
≦ 2% |
No |
No |
Phosphine (PH3) Detection Tubes (200 to 5500 ppm)
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