Gastec 3M Quick-measuring Detector tubes Ammonia NH3 (10-1000ppm)
ManufacturerGastec(View more products from this manufacturer)
Model3M
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Indicator: 50 to 500 ppm
Measuring Range:
+ 10 to 50 ppm, Number of Pump Strokes 2 to 5
+ 50 to 500 ppm, Number of Pump Strokes 1
+ 500 to 1000 ppm, Number of Pump Strokes 1/2
Sampling Time: 45 second per pump stroke
Colour Change: Purple → Yellow
Reaction Principle: 3NH3 + H3PO4 → (NH4)3PO4
Coefficient of Variation: 5% (for 50 to 500 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 | 45 seconds per pump stroke | |||
| Detecting Limit | 2 ppm (n=5) | |||
| Colour Change | Purple → Yellow | |||
| Reaction Principle | 3NH3 + H3PO4 → (NH4)3PO4 | |||
| Coefficient of Variation | 5% (for 50 to 500 ppm) | |||
| Shelf Life | 3 Years | |||
| Corrections for temperature & humidity | Unnecessary | |||
| Store the tubes in dark and cool place. | ||||
Possible coexisting substances and their interferences (NOTE)
| Substance | Concentration | Interference | Change colour by itself to |
| Diamines | 1/8 | + | Yellow |
| Monoamines | 1/15 | + | Yellow |
| Carbon dioxide | 1% |  |
No |
Other substance measurable with this detector tube
| Substance | Correction Factor | No. of pump strokes | Measuring Range |
| Trimethylamine | 0.5 | 1 | 25 to 250 ppm |
| Calibration gas generation | Permeation tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 25 ppm (2014) | 35 ppm (2014) | 15 to 28% |
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