Hydrogen 0.5 %/a, 0.5 - 3.0 Vol.-%, Part # CH30901, 10 Tests 

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 š pink

Ambient Operating Conditions

Temperature: 5 to 40 °C

Absolute Humidity: < 30 mg H2O / L

Reaction Principle

a) H2 + 1 /2 O2 š H20

b) H2O + SeO2 + H2SO4 š 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.

Additional Information

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