Indicator: 5 to 100 ppm
Measuring Range:
+ 1.25 to 2.5 ppm, Number of Pump Strokes 4
+ 2.5 to 5 ppm, Number of Pump Strokes 2
+ 5 to 100 ppm, Number of Pump Strokes 1
+ 100 to 200 ppm, Number of Pump Strokes 1/2
Sampling Time: 45 seconds per pump stroke
Colour Change: Blue → Yellow
Reaction Principle: SO2 + BaCl2 +H2O → BaSO3 + 2HCl, HCl+Base → Chloride
Coefficient of Variation: 10% (for 5 to 20 ppm), 5% (for 20 to 100 ppm)
Nr. of tests: 10
Pump: GV-100S/110S
Performance
| Measuring Range |
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| Number of Pump Strokes |
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| Correction Factor |
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| Sampling Time | 45 seconds per pump stroke | ||||
| Detecting Limit | 0.25 ppm (n=4) | ||||
| Colour Change | Blue → Yellow | ||||
| Reaction Principle | SO2 + BaCl2 +H2O → BaSO3 + 2HCl HCl+Base → Chloride |
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| Coefficient of Variation | 10% (for 5 to 20 ppm), 5% (for 20 to 100 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 | No | No | |
| Nitrogen dioxide | ≧ 1/1 | + | Pale purple |
| Hydrogen sulphide | No | No |
| Calibration gas generation | Permeation tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| - | 0.25 ppm (2014) | - |
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