Patent ID: 7182846

Claim:
A gas sensor element comprising: a measurement gas chamber into which measurement gasses enter, subjected to a given diffusion resistance; an oxygen pump cell working to control a concentration of oxygen contained in the measurement gasses within said measurement gas chamber, said oxygen pump cell including an oxygen ion-conductive solid electrolyte body and a first and a second oxygen pump electrode affixed to the oxygen ion-conductive solid electrolyte body, the first oxygen pump electrode being exposed to said measurement gas chamber; and a hydrogen-containing gas measurement cell working to measure a concentration of a hydrogen-containing gas contained in the measurement gasses within said measurement gas chamber, said hydrogen-containing gas measurement cell including a proton-conductive solid electrolyte body and a first and a second gas measurement electrode affixed to the proton-conductive solid electrolyte body, the first gas measurement electrode being exposed to said measurement gas chamber and adapted to produce a signal between the first and second gas measurement electrodes as a function of the concentration of the hydrogen-containing gas, the second gas measurement electrode being exposed to a reference gas chamber filled with a given reference gas.