Electrode assembly for an electrochemical gas sensor

Electrochemical gas sensor comprising a sensor housing (1) having an electrode arrangement in a liquid electrolyte in a common electrolyte space (2), with a first Potenziostatschaltung (9) and a second Potenziostatschaltung (10) for operation of the electrochemical gas sensor, wherein a) a first set of electrodes composed (of a measuring electrode 3), a first counter electrode (5) and a first reference electrode (7), and b) a second set of electrodes, consisting (from a guard electrode 4), a second counter electrode (6) and a second reference electrode (8) are arranged in a common electrolyte space, c) wherein said protective electrode (4) of the second set of electrodes between the measuring electrode (3) of the first set of electrodes and said at least (a counter electrode 5, 6, 204) of the first or second set of electrodes is disposed, and wherein d) the measuring electrode (3), the first counter electrode (5) and the first reference electrode (7) with the first Potenziostatschaltung (9) are connected, wherein e) the protective electrode ...