Gastec 3D Passive Dosl 튜브 암모니아 NH3 검지관 (2.5 ~ 1000 ppm)
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Indicator: 25~500 ppm
Measuring Range: 2.5 ~ 1000 ppm
Sampling Hours: 0.5 to10 hours
Colour Change: Purple → Yellow
Reaction Principle: 2NH3 + H2SO4 → (NH4)2SO4
Coefficient of Variation: 10% (25 ~ 500 ppm-hr)
Nr. of tests: 10
Performance
| Measuring Range | 2.5 to 1000 ppm |
| Sampling Hours | 0.5 to10 hours |
| Detecting Limit | 0.5 ppm (10 hours) |
| Colour Change | Purple → Yellow |
| Reaction Principle | 2NH3 + H2SO4 → (NH4)2SO4 |
| Coefficient of Variation | 10% (for 25 to 500 ppm-hr) |
| Shelf Life | 3 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 |
| Amines, Hydrazine | + | Yellow | |
| Aromatic amines | No | No |
Other substance measurable with this detector tube
| Substance | Correction Factor | Sampling Time | Measuring Range |
| Dimethylamine | 0.75 | 0.5 to 10 hours | 1.9 to 750 ppm |
| N,N-Dimethylethylamine | 1.6 | 0.5 to 10 hours | 4 to 1600 ppm |
| Hydrazine | 0.65 | 0.5 to 10 hours | 1.6 to 650 ppm |
| Triethylamine | 2.1 | 0.5 to 10 hours | 5.3 to 2100 ppm |
| Calibration gas generation | Permeation tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 25 ppm | 35 ppm | 15 to 28% |
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