| CH2FCHCN |
 |
Performance
| Measuring Range |
| 0.1 to 0.2 ppm |
0.2 to 6.0 ppm |
6.0 to 18.0 ppm |
|
| Number of Pump Strokes |
|
| Correction Factor |
|
| Sampling Time |
3 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 |
| Coefficient of Variation |
10% (for 0.25 to 1 ppm), 5% (for 1 to 6 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 |
- |
3 to 17% |
