Hydrogen cyanide |
NO.12L |
| HCN |  |
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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 | 2 minutes per pump stroke | ||||
| Detecting Limit | 0.1 ppm (n=5) | ||||
| Colour Change | Yellow → Red | ||||
| Reaction Principle | 2HCN + HgCl2 → Hg(CN)2+ 2HCl HCl + Base → Chloride product |
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| Coefficient of Variation | 10% (for 2.5 to 20 ppm), 5% (for 20 to 60 ppm) | ||||
| Shelf Life | 2 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 |
| sulphur dioxide | 20 ppm | + | Red |
| Hydrogen sulphide | 5 ppm | + | Red |
Other substance measurable with this detector tube
| Substance | Correction Factor | No. of pump strokes | Measuring Range |
| Acetone cyanohydrine | 1.15 | 1 | 2.88 to 69 ppm |
| Boron trichloride | by scale | 2 | 0.5 to 20 ppm |
| Calibration gas generation | Permeation tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| - | C 4.7 ppm | 5.6 to 40% |
