Application Range: Standard Measuring Range: 5 to 60 vol. % Number of Strokes n: 1 Time for Measurement: Approx. 2 min Standard Deviation: ± 10 to 15 % Color Change: White → Violet Ambient Operating Conditions: Temperature: 0 to 40 °C Absolute Humidity: max. 50 mg H2O / L Reaction Principle: CO2 + N2H4 → NH2-NH-COOH Cross Sensitivity: Hydrogen sulphide is not indicated near the limit value. Sulfur dioxide is indicated with approx. half sensitivity.