Gastec 181 Quick-measuring Detector tubes Aniline C6H5NH2 (1.25~60ppm)
ManufacturerGastec(View more products from this manufacturer)
Model181
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Indicator: 2.5 to 30 ppm
Measuring Range:
+ 1.25 to 2.5 ppm, Number of Pump Strokes 5
+ 2.5 to 30 ppm, Number of Pump Strokes 3
Sampling Time: 1 minute per pump stroke
Colour Change: Pale yellow → Pale green
Reaction Principle: C6H5NH2 + Cr6+ → Cr3+
Coefficient of Variation: 10% (for 2.5 to 10 ppm), 5% (for 10 to 30 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 minute per pump stroke | |||
| Detecting Limit | 0.25 ppm (n=5) | |||
| Colour Change | Pale yellow → Pale green | |||
| Reaction Principle | C6H5NH2 + Cr6+ → Cr3+ | |||
| Coefficient of Variation | 10% (for 2.5 to 10 ppm), 5% (for 10 to 30 ppm) | |||
| Shelf Life | 3 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 |
| Ammonia | 1/10 time | + | No |
| Amines | 1/10 time | + | No |
| Aromatic amines | + | Pale green |
Other substance measurable with this detector tube
| Substance | Correction Factor | No. of pump strokes | Measuring Range |
| N-methylaniline | Factor:1.4 | 2 | 3.5 to 42 ppm |
| N,N-Dimethylaniline | Factor:1.0 | 3 | 2.5 to 30 ppm |
| o-Toluidine | Factor: 2.0 | 2 | 5 to 60 ppm |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 2 ppm | - | 1.3 to 11% |
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