Hydrogen fluoride |
NO.17D |
| HF |
 |
Performance
| Measuring Range | 1 to 100 ppm |
| Sampling Hours | 1 to 10 hours |
| Detecting Limit | 0.5 ppm (10 hours) |
| Colour Change | Yellow → Purple |
| Reaction Principle | HF + Indicator Purple product |
| Coefficient of Variation | 15% (for 10 to 20 ppm-hr),10% (for 20 to 100 ppm-hr) |
| Shelf Life | 3 Years |
| Corrections for temperature & humidity | Temperature and 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 |
| Chlorine | 1/5 | + | Bleaches zero zone |
| Hydrogen chloride Nitric acid |
1/5 | + | Purple |
| Calibration gas generation | Permeation tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 0.5ppm | C 2 ppm | - |