Application and Sensor Principle
H2 in air or oxygen
0 - 10 vol-% H2
Calorimetry
The detection principle is the chemical oxidation of hydrogen with oxygen from the atmosphere that occurs at the catalytic layer of the sensor. This generates a reaction heat. The resulting increase of the temperature of the active sensing element in reference to a second inactive element is measured.
Interface:
H2 in inert gases
0 - 100 vol-% H2
Thermal conductivity
Detection principle is the determination of the physikalical heat conductivity of the gas, surrounding the sensor. The conductivity is given by all components of the gas. The presence of hydrogen results in a particularly high change of its value.