| |
|
|
|
Acrylonitrile |
|
NO.191 |
|
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% |
|
|
|
|
|
|
Gastec Tubes and
Sampling Pump
