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Indicator:
+ Tube SO2: 0.5~10ppm
+ Tube H2S: 5~60ppm
Measuring Range SO2 tube
+ 0.25~5ppm, Number of Pump Strokes 2
+ 0.5~10ppm, Number of Pump Strokes 1
+ 10~20ppm, Number of Pump Strokes 1/2
Measuring Range H2S tube
+ 1.25~2.5ppm, Number of Pump Strokes 2
+ 2.5~60ppm, Number of Pump Strokes 1
+ 60~120ppm, Number of Pump Strokes 1/2
Sampling Time: 2 minute per pump stroke
Colour Change:
+ TubeSO2: Yellowish green → Yellow
+ Tube H2S: White → Brown
Reaction Principle:
+ Tube SO2: SO2 + BaCl2+ H2O → BaSO3 + 2HCl, HCl + Base → Chloride
+ Tube H2S: H2S + Pb(CH3COO)2 → PbS + 2CH3COOH
Coefficient of Variation:
+ Tube SO2: 10% (for 0.5 to 2 ppm), 5% (for 2 to 10 ppm)
+ Tube H2S: 10% (for 2.5 to 10 ppm), 5% (for 10 to 60 ppm)
Nr. of tests: 5
Pump: GV-100S/110S
| Name of Gas |
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| Measuring Range |
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| Number of Pump Strokes |
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| Correction Factor |
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| Sampling Time | 2 minute per pump stroke | ||||||
| Detecting Limit | 0.05 ppm (n=2) | ||||||
| Colour Change | SO2tube : Yellowish green → Yellow H2S tube : White → Brown |
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| Reaction Principle | SO2tube: SO2 + BaCl2+ H2O → BaSO3 + 2HCl HCl + Base → Chloride H2S tube: H2S + Pb(CH3COO)2 → PbS + 2CH3COOH |
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| Coefficient of Variation | SO2 tube: 10% (for 0.5 to 2 ppm), 5% (for 2 to 10 ppm) H2S tube:10% (for 2.5 to 10 ppm), 5% (for 10 to 60 ppm) |
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| Shelf Life | 3 Years | ||||||
| Corrections for temperature & humidity | Unnecessary | ||||||
| Store the tubes at cool and dark place. | |||||||
| Substance | Concentration | Interference | Change colour by itself to | ||
| SO2 tube | H2S tube | SO2 tube | H2S tube | ||
| Nitrogen dioxide | 5 ppm | + | No | Pale purple | No |
| Nitrogen monoxide Mercaptans Carabon monoxide |
No | No | No |
| Calibration gas generation | Permeation tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| SO2:--(2014) H2S:1 ppm (2014) |
SO2:0.25 ppm (2014) H2S:5 ppm (2014) |
H2S : 4.0 to 44% |
