Draeger CH28201 Hydrogen Sulfide + Sulfur Dioxide 0.2%/A Detector Tubes (10 tests per box)

Application Range:

• Standard Measuring Range: 0.2 to 7 vol. %
• Number of Strokes n: 1 + 2 desorption strokes in clean air
• Time for Measurement: Approx. 2 min
• Standard Deviation: ± 5 to 10 %
• Color Change: Brown → Bright Yellow

Ambient Operating Conditions:

• Temperature: 0 to 40 °C
• Absolute Humidity: max. 40 mg H2O / L

Reaction Principle:

• H2S + I2 → 2 HI + S2
  SO2 + I2 + 2H2O → 2 HI + H2SO4

Cross Sensitivity:

• All substances oxidized by iodine are indicated, but with different sensitivities.
• It is impossible to measure hydrogen sulfide and sulfur dioxide in the presence of such substances.

Extension of the Measuring Range:

• Using n = 10, divide the reading by 10; the measuring range will be 0.02 to 0.7 vol. %.