Hydrogen fluoride |
NO.17 |
| HF |  |
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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 | 0.1 ppm (n=7) | |||
| Colour Change | Yellow → Brownish Pink | |||
| Reaction Principle | Hydrogen fluoride reacts with indicator to produce brownish pink colour. HF + Indicator → Chemical reaction compound |
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| Coefficient of Variation | 10% (for 0.5 to 5 ppm), 5% (for 5 to 20 ppm) | |||
| Shelf Life | 3 Years | |||
| Corrections for temperature & humidity | Humidity 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 |
| Hydrogen chloride, Nitric acid | 1/5 time | + | Brownish pink |
| Chlorine, Nitrogen dioxide | 1/10 time | + | Brownish pink |
Other substance measurable with this detector tube
| Substance | Correction Factor | pump stroke | Temperature | Absolute Humidity | Colour Change |
| Fluorine | 2.5 | 1 | 20ºC (68ºF) | 9 mg/L | Brown |
| 1.0 | 1 | 20ºC (68ºF) | 3 mg/L |
| Calibration gas generation | Permeation tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 0.5ppm | C2 ppm | - |
