Sulfur Dioxide (SO2) Detection Tubes (20 to 3600 ppm)
Gastec Detection Tube No. 5M measures Sulfur Dioxide with a Range of 20 to 3600 ppm.
- Measuring Range:
- 20 to 100 ppm
- 100 to 1800 ppm
- 1800 to 3600 ppm
- Number of Pump Strokes: 4, 1, 1/2
- Correction Factor: 1/5, 1, 2
- Sampling Time: 45 seconds per pump stroke
- Detecting limit: 4 ppm (4 pump strokes)
- Changes from Purple to Yellow
- Corrections for temperature & humidity: Temperature correction is necessary
- Reaction Principle:
- SO2 + BaCl2 + H2O → BaSO3 + 2HCl
- HCl + Base → Chloride
- Relative Standard Deviation: 10% (for 100 to 600 ppm), 5% (for 600 to 1800 ppm)
- 3 Year Shelf Life
- Store the tubes at cool and dark place.
Possible coexisting substances and their interferences:
| Substance |
Concentration |
Interference |
Changes color by itself to |
| Nitrogen sulfide |
≧ 1/10 |
+ |
White (≧ 600 ppm) |
| Hydrogen sulfide |
≧ 10 times |
- |
No |
| Carbon dioxide |
|
No |
No |
| Carbon monoxide |
|
No |
No |
| Nitric oxide |
|
No |
No |
Sulfur Dioxide (SO2) Detection Tubes (20 to 3600 ppm)
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