The invention is directed to a measuring cell for an electrochemical gas sensor having an electrolytic chamber and a measuring electrode as well as a counter electrode. In the direction facing the ambient, the measuring electrode includes a diffusion membrane as well as a diffusion barrier.

The diffusion barrier is made of a material which is a good conductor of heat and is provided with a plurality of passages. A temperature-sensitive element is provided in the immediate proximity of these passages and faces toward the ambient. With this configuration, the temperature dependency of the diffusion capacity of the gas sample passing through the diffusion barrier can be included in the processing of the signal indicative of the measurement.

Description
FIELD OF THE INVENTION
The invention relates to a measuring cell for an electrochemical gas sensor having a housing defining an electrolytic chamber which accommodates at least one measuring electrode and a counter electrode. A porous membrane is mounted in the housing and separates the chamber from the ambient to be investigated and contains the electrolyte in the chamber. The porous membrane is permeable to the gaseous substance to be detected. The measuring cell also includes a diffusion barrier mounted in the housing so as to be interposed between the ambient and the membrane and includes passages for passing the gaseous substance to the porous membrane.