Gastec 191 有机气体检测管; 丙烯腈 CH2：CHCN（2~360ppm）
制造商: Gastec Model: 191 - 联系
Indicator: 5 to 120 ppm
Measuring Range:
+ 2 to 5 ppm, Number of Pump Strokes 4
+ 5 to 120 ppm, Number of Pump Strokes 2
+ 120 to 360 ppm, Number of Pump Strokes 1
Sampling Time: 45 seconds per pump stroke
Colour Change: Yellow → Red
Reaction Principle: 10% (for 5 to 40 ppm), 5% (for 40 to 120 ppm)
+ Pretreatment tube: CH2:CHCN + Cr6+ + H2SO4 → HCN
+ Detector tube : 2HCN + HgCl2 → 2HCl + Hg(CN)2
+ HCl + Base → Chloride
Coefficient of Variation:
Nr. of tests: 5
Pump: GV-100S/110S
Details
Performance
| Measuring Range |
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| Number of Pump Strokes |
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| Correction Factor |
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| Sampling Time | 45 seconds per pump stroke | |||
| Detecting Limit | 1 ppm (n=4) | |||
| Colour Change | Yellow → Red | |||
| Reaction Principle |
Pretreatment tube: CH2:CHCN + Cr6+ + H2SO4 → HCN |
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| Coefficient of Variation | 10% (for 5 to 40 ppm), 5% (for 40 to 120 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 |
| Nitriles (C3) | 10 ppm | + | Red |
| Acetone cyanohidrin | 10 ppm | + | Red |
| Alcohols, Esters, Ketones | No | ||
| Aromatic hydrocarbons | No | ||
| Hydrogen chloride, Hydrogen cyanide |
No |
Other substance measurable with this detector tube
| Substance | Correction Factor | No. of pump strokes | Measuring Range |
| Propionnitrile | 1.0 | 4 | 50 to 1200ppm |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 2 ppm (2014) | - | 3 to 17% |
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