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% |