Gas sensor electrode device

(57) Abstract: The present invention, the potential change at the gas-sensitive layer disposed in the groove of the height (h), for the measurement of volume changes and / or conductive changed, the on the support plate with at least one three-dimensional electrode unit to form a groove of wear to a depth (T), a sensor element for electrochemical measurement sensor for detecting gas concentration. In this case the gas-sensitive layer (14) height (h) less composed than the depth (T) of the groove (26).