|
|
| Sulfur dioxide |
SO2 |
NO.5DH |
| Performance |
Measuring
Range
|
10 to 600 ppm |
Sampling Hours
|
1 to 5 hours |
Detecting Limit
|
1ppm (5 hours) |
Color Change
|
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 |
Substance
|
Concentration
|
Interference |
Change
color by itself |
Nitrogen dioxide
|
-
|
Minus error
|
No discoloration |
Hydrogen sulfide
|
-
|
Plus error
|
White
(discolors brown at demercation) |
| Calibration
gas generation |
Permeation tube method |
TLV-TWA
|
TLV-STEL
|
Explosive
range |
| 2ppm |
5ppm |
- |
|
