Application Range
Standard Measuring Range: 0.5 to 3.0 vol. %
Number of Strokes n: 5
Time for Measurement: approx. 1 min
Standard Deviation: ± 10 to 15%
Color Change: yellow green -> pink
Ambient Operating Conditions
Temperature: 5 to 40 °C
Absolute Humidity: < 30 mg H2O / L
Reaction Principle
a) H2 + 1/2 O2 -> H20
b) H2O + SeO2 + H2SO4 -> pink reaction product
Cross Sensitivity
Up to 1,000 ppm CO has no influence on the indication; higher concentrations lead to lower measurement results. Acetylene and alcohols react similarly to hydrogen
Cross Sensitivity
Do not use in potentially explosive areas. Qualify before use with a combustible gas monitor. When the hydrogen concentration is above 3 vol. % the catalysis layer heats up during the measurement with a reddish glow. Determination of hydrogen in air with at least 5 vol. % O2.
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