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硝酸检测管15L HNO3 Nitric acid Nitric acid No.15L
HNO3
| Performance |
Measuring Range | 0.1 to 1 ppm | 1 to 20 ppm | 20 to 40 ppm |
Number of Pump Strokes | 2 to 10 | 1 | 1/2 |
Correction Factor | 1/2 to 1/10 | 1 | 2 |
Sampling Time | 45 seconds per pump stroke | ||
Detecting Limit | 0.05 ppm (n=10) | ||
Color Change | Yellow →Reddish purple | ||
Reaction Principle | HNO3 + Indicator → Chemical reaction product | ||
| Coefficient of Variation | 15% (for 1 to 5 ppm), 10% (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 color by itself |
Hydrogen chloride | 1/10 time | Plus error | Produces reddish purple stain |
Chlorine | - | No effect | Bleach the discoloration |
Carbon monoxide | - | No effect | No discoloration |
Nitrogen dioxide | - | No effect | No discoloration |
Organic solvents | - | No effect | No discoloration |
| Other substance measurable with this detector tube |
Substance | Correction | Pump Strokes | Measuring Range |
Hydrogen bromide | 0.8 | 1 | 0.8 to 16 ppm |
Trichloroacetic acid | by scale | 1 | 1 to 37.5 ppm |
| Calibration gas generation | High pressure gas cylinder method | |
| TLV-TWA | TLV-STEL | Explosive range |
| 2ppm | 4ppm | - |