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.
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