Gastec 192 Quick-measuring Detector tubes Acrylonitrile CH2：CHCN (0.2~32ppm)
ManufacturerGastec(View more products from this manufacturer)
Model192
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Indicator: 0.5 to 10 ppm
Measuring Range:
+ 0.2 to 0.5 ppm , Number of Pump Strokes 4
+ 0.5 to 10 ppm, Number of Pump Strokes 2
+ 10 to 32 ppm , Number of Pump Strokes 1
Sampling Time: 2 minute per pump stroke
Colour Change: Yellow → Red
Reaction Principle:
+ CH2:C(CH3)CN+ 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 10 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 | 0.1 ppm (n=4) | |||
| Colour Change | Yellow → Red | |||
| Reaction Principle | CH2:C(CH3)CN+ 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 10 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 |
Nitriles ( C3) |
+ | Red | |
| Acetone cyanohidrin | + | Red | |
| Alcohols, Esters, Ketones | 20 ppm |  |
No |
| Aromatic hydrocarbons | 20 ppm | |
No |
| Hydrogen chloride, Hydrogen cyanide |
No | No |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 1 ppm(2014) | - | - |
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