Draeger CH24201 Sulfur Dioxide 20/a Detector Tubes (10 tests per box)

Application Range:

• Standard Measuring Range: 20 to 200 ppm
• Number of Strokes n: 10
• Time for Measurement: approx. 3 min
• Standard Deviation: ± 10 to 15 %
• Color Change: brown yellow → white

Ambient Operating Conditions:

• Temperature: 0 to 40 °C
• Absolute Humidity: < 30 mg H2O / L

Reaction Principle:

• SO2 + I2 + 2 H2O → H2SO4 + 2 HI

Cross Sensitivity:

• Hydrogen sulfide is indicated, with the same sensitivity.
• It is impossible to measure sulfur dioxide in the presence of hydrogen sulfide.
• Nitrogen dioxide will shorten the reading.

Extension of the Measuring Range:

• Using n = 1+3 desorption strokes, multiply the reading by 10; the range of measurement is 200 - 2,000 ppm.
• The desorption strokes are to be taken in clean air (i.e. free of sulfur dioxide) immediately following the single pump stroke.