Indicator: 50 to 600 ppm
Measuring Range: 10 to 600 ppm
Sampling Hours: 1 to 5 hours
Colour Change: Bluish purple → White
Reaction Principle: SO2 + I2 +H2O → 2HI + H2SO4
Coefficient of Variation: 10% (for 50 to 600 ppm･hr)
Nr. of tests: 10
Catalog
Performance
| Measuring Range |
10 to 600 ppm |
| Sampling Hours |
1 to 5 hours |
| Detecting Limit |
1 ppm (5 hours) |
| Colour Change |
Bluish purple → White |
| Reaction Principle |
SO2 + I2 +H2O → 2HI + H2SO4 |
| Coefficient of Variation |
10% (for 50 to 600 ppm･hr) |
| 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 |
| Nitrogen dioxide |
|
 |
No |
| Hydrogen sulphide |
|
+ |
White |
| Calibration gas generation |
Permeation tube method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| - |
0.25 ppm (2014) |
- |
