| |
|
|
|
Sulphur dioxide |
|
NO.5Lb |
|
SO2 |
 |
|
|
Performance |
| Measuring Range |
| 0.05 to 0.1 ppm |
0.1 to
0.2 ppm |
0.2 to
5.0 ppm |
5.0 to
10.0 ppm |
|
| Number of Pump Strokes |
|
| Correction Factor |
|
| Sampling Time |
1 minute per pump stroke |
| Detecting Limit |
0.01 ppm (n=8) |
| Colour Change |
Yellowish green → Yellow |
| Reaction Principle |
SO2 + BaCl2 +H2O BaSO3 + 2HCl
HCl+Base Chloride |
| Coefficient of Variation |
10% (for 0.2 to 1 ppm), 5% (for 1 to 5 ppm) |
| Shelf Life |
3 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 |
Carbon monoxide,
Nitric oxide |
|
No |
No |
| Carbon dioxide |
100% |
+ |
yellow |
| Nitrogen dioxide |
1 ppm |
Unclear demarcation |
yellow |
| Hydrogen sulphide |
|
No |
No |
|
|
|
Calibration
gas
generation |
Permeation
tube
method |
|
TLV-TWA |
TLV-STEL |
Explosive
range |
|
2 ppm |
5 ppm |
- |
|
|
|
|
|
|
|
|
Gastec Tubes and
Sampling Pump
