Indicator: 10 ~ 200 ppm
Measuring Range: 1 ~ 200 ppm
Sampling Hours: 1~10 hours
Colour Change: Yellow → Pink
Coefficient of Variation: 10% (for 10 to 40 ppm-hr),5% (for 40 to 200 ppm-hr)
Nr. of tests: 10
Detail
Catalog
Performance
| Measuring Range |
1 to 200 ppm |
| Sampling Hours |
1 to 10 hours |
| Detecting Limit |
0.3 ppm (10 hours) |
| Colour Change |
Yellow → Pink |
| Reaction Principle |
Hydrogen Cyanide reacts with the reagent to form intermediate material which stains indicator pink . |
| Coefficient of Variation |
10% (for 10 to 40 ppm-hr),5% (for 40 to 200 ppm-hr) |
| Shelf Life |
2 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 |
| Basic gases |
|
 |
No discolouration |
| Acid gases |
|
+ |
Pink |
| Nitrogen Dioxide |
 0.5ppm |
+ |
Pink |
| Hydrogen Sulphide |
|
+ |
Pink |
| Calibration gas generation |
Permeation tube method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| - |
C 4.7 ppm (2014) |
5.6 to 40% |
