CH2FCHCN |
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Performance
Measuring Range |
2 to 5 ppm |
5 to 120 ppm |
120 to 360 ppm |
|
Number of Pump Strokes |
|
Correction Factor |
|
Sampling Time |
1 minute per pump stroke |
Detecting Limit |
1 ppm (n=4) |
Colour Change |
Yellow → Red |
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 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 120% |
Calibration gas generation |
Diffusion tube method |
TLV-TWA |
TLV-STEL |
Explosive range |
2 ppm |
- |
3 to 17% |