Indicator: 0.5 to 6.0 ppm
Measuring Range:
+ 0.5 to 6.0 ppm, Number of Pump Strokes 4
+ 6.0 to 15 ppm, Number of Pump Strokes 2
Sampling Time: 2 minute per pump stroke
Colour Change: Yellow → Red
Reaction Principle:
+ CH3CH2CH:CHCN + Cr6+ + H2SO4 → HCN
+ 2HCN+HgCl2 → 2HCl+ Hg(CN)2
+ HCl+Base → Chloride.
Coefficient of Variation: 10% (for 0.5 to 2 ppm), 5% (for 2 to 6 ppm)
Nr. of tests: 5
Pump: GV-100S/110S
Catalog
Manual
Performance
| Measuring Range |
| 0.5 to 6.0 ppm |
6.0 to 15 ppm |
|
| Number of Pump Strokes |
|
| Correction Factor |
|
| Sampling Time |
2 minutes per pump stroke |
| Detecting Limit |
0.1 ppm(n=4) |
| Colour Change |
Yellow → Red |
| Reaction Principle |
CH3CH2CH:CHCN + Cr6+ + H2SO4 → HCN
2HCN+HgCl2 → 2HCl+ Hg(CN)2
HCl+Base → Chloride. |
| Coefficient of Variation |
10% (for 0.5 to 2 ppm), 5% (for 2 to 6 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 |
| Hydrogen chloride |
|
No |
No |
| Hydrogen cyanide |
|
No |
No |
Nitriles ( C3) |
|
+ |
Red |
| Acetone cyanohidrin |
|
+ |
Red |
| Alcohols, Esters, Ketones |
20 ppm or higher |
 |
No |
| Aromatic hydrocarbons |
20 ppm or higher |
|
No |
Note: Humidity scrubber removes humidity and acid gases. |
| Calibration gas generation |
Diffusion tube method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| - |
- |
- |
