Gastec 191L Quick-measuring Detector tubes Acrylonitrile CH2：CHCN (0.1~18ppm)
ManufacturerGastec(View more products from this manufacturer)
Model191L
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Indicator: 0.2 to 6.0 ppm
Measuring Range:
+ 0.1 to 0.2 ppm, Number of Pump Strokes 4
+ 0.2 to 6.0 ppm, Number of Pump Strokes 2
+ 6.0 to 18.0 ppm, Number of Pump Strokes 1
Sampling Time: 2 minute per pump stroke
Colour Change: Yellow → Pink
Reaction Principle:
+ Pretreatment tube: CH2:CHCN + Cr6+ + H2SO4 → HCN
+ Detector tube : 2HCN + HgCl2 → 2HCl + Hg(CN)2
+ HCl + Base → Chloride
Coefficient of Variation: 10% (for 0.2 to 2.0 ppm), 5% (for 2.0 to 6.0 ppm)
Nr. of tests: 5
Pump: GV-100S/110S
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 | 0.05 ppm (n=4) | |||
| Colour Change | Yellow → Pink | |||
| Reaction Principle | Pretreatment tube: CH2:CHCN + Cr6+ + H2SO4 → HCN Detector tube : 2HCN + HgCl2 → 2HCl + Hg(CN)2 HCl + Base → Chloride |
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| Coefficient of Variation | 10% (for 0.2 to 2.0 ppm), 5% (for 2.0 to 6.0 ppm) | |||
| Shelf Life | 3 Years | |||
| Corrections for temperature & humidity | Unnecessary | |||
| 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) |
+ | Pink | |
| Acetone cyanohidrin | + | Pink | |
| Alcohols, Esters, Ketones | No | No | |
| Aromatic hydrocarbons | No | No |
Other substance measurable with this detector tube
| Substance | Correction Factor | No. of pump strokes | Measuring Range |
| n-Butyronitrile | 30 | 1 | 6 to 180 ppm |
| 2-Methyl-3-butenenitrile | 2.0 | 2 | 0.4 to 12 ppm |
| 2-Pentenenitrile | 1.2 | 2 | 0.24 to 7.2 ppm |
| 3-Pentenenitrile | 2.0 | 2 | 0.4 to 12 ppm |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 2 ppm(2014) | - | 3 to 17% |
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