|
|
| Performance |
Measuring
Range
|
0.2 to 100 ppm |
Sampling Hours
|
1 to 10 hours |
Detecting Limit
|
0.1ppm (10 hours) |
Color Change
|
Green ---> Yellow |
| Reaction
Principle |
Sulfur dioxide
react with barium chloride to produce
hydrogen chloride to discolor the pH indicator to yellow |
| Coefficient
of Variation |
10% (for 2 to 10
ppm¥hr),5% (for 10 to 100 ppm¥hr) |
| Shelf
Life |
3 Years |
| Corrections
for temperature & humidity |
Unnecessary |
| Store the
tubes at cool and dark place. |
| Possible
coexisting substances and their interferences |
Substance
|
Concentration
|
Interference |
Change
color by itself |
Nitrogen dioxide
|
-
|
Minus error
|
No discoloration |
Hydrogen sulfide
|
-
|
Plus error
|
No discoloration |
| Calibration
gas generation |
Permeation tube method |
TLV-TWA
|
TLV-STEL
|
Explosive
range |
| 2ppm |
5ppm |
- |
|
