To improve a temperature adjustability for a measurement electrode of a gas sensor based on a mixed potential principle in terms of classification.

The sensor for measuring a concentration of a component gas in a mixed gas has at least one measurement electrode 1, 2 and a reference electrode 3 exposed to the mixed gas. The sensor also has a heating device 7 for adjusting a temperature of at least one measurement electrode 1, 2 and the reference electrode 3. A measurement signal detectable by at least one measurement electrode 1, 2 can be changed by a correction value dependent on a heating output of the heating device 7 necessary for achieving a value presettable by a heating resistance of at least one heating element of the heating device 7.