| CH2FCHCN |
 |
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% |
