Indicator: 0.5 to 6.0 ppm
Measuring Range:
+ 0.5 to 6.0 ppm, Number of Pump Strokes 4
+ 6.0 to 15 ppm, Number of Pump Strokes 2
Sampling Time: 2 minute per pump stroke
Colour Change: Yellow → Red
Reaction Principle:
+ CH3CH2CH:CHCN + Cr6+ + H2SO4 → HCN
+ 2HCN+HgCl2 → 2HCl+ Hg(CN)2
+ HCl+Base → Chloride.
Coefficient of Variation: 10% (for 0.5 to 2 ppm), 5% (for 2 to 6 ppm)
Nr. of tests: 5
Pump: GV-100S/110S
Detail
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=4) | ||
| Colour Change | Yellow → Red | ||
| Reaction Principle | CH3CH2CH:CHCN + Cr6+ + H2SO4 → HCN 2HCN+HgCl2 → 2HCl+ Hg(CN)2 HCl+Base → Chloride. |
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| Coefficient of Variation | 10% (for 0.5 to 2 ppm), 5% (for 2 to 6 ppm) | ||
| Shelf Life | 3 Years | ||
| Corrections for temperature & humidity | Temperature 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 | No | No | |
| Hydrogen cyanide | No | No | |
Nitriles ( C3) |
+ | Red | |
| Acetone cyanohidrin | + | Red | |
| Alcohols, Esters, Ketones | 20 ppm or higher |  |
No |
| Aromatic hydrocarbons | 20 ppm or higher | |
No |
Note: Humidity scrubber removes humidity and acid gases. |
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| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| - | - | - |
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