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Indicator: 5 to 50 ppm
Measuring Range:
+ 2 to 5 ppm, Number of Pump Strokes 2
+ 5 to 50 ppm, Number of Pump Strokes 1
+ 50 to 125 ppm, Number of Pump Strokes 1/2
Sampling Time: 3 minutes per pump stroke
Colour Change: Bluish Purple → White
Reaction Principle: COS + I2O5 + H2SO4 → SO2 + CO2, SO2 + I2 + H2O → 2HI + H2SO4
Coefficient of Variation: 10% (for 5 to 10 ppm), 5% (for 10 to 50 ppm)
Nr. of tests: 5
Pump: GV-100S/110S
 500 ppm |
+(Black) | Black at 500ppm | |
| sulphur dioxide, Carbon disulphide | + | White | |
| Carbon dioxide | No | No | |
| Nitrogen dioxide | 2 ppm |
+ | Brown at 2ppm |
| Hydrogen sulphide |  1000 ppm |
No effect at 1 pump stroke | *1 |
| Propane, Butane | 10% |
No | Black at the top of the discoloured area. |
*1: If the primary tube is totally discoloured, the analyzer tube will be discoloured white due to the effect of hydrogen sulphide. |
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| Calibration gas generation | High pressure gas cylinder method |
| TLV-TWA | TLV-STEL | Explosive range |
| 5ppm(2014) | - | 12 to 19% |
