GAS SENSOR ELEMENT AND GAS SENSOR

摘要

A gas sensor element (120) configured as a laminate of an oxygen pump cell (135) and an oxygen concentration detection cell (150) with a spacer (145) sandwiched therebetween. The spacer (145) has a gas detecting chamber (145c) formed therein and electrodes (138) and (152) of the cells (135) and (150), respectively, facing the chamber (145c). A leakage section (148) is faces the gas detecting chamber (145c) (measuring chamber).

主权项

1. A gas sensor element comprising:
a measuring chamber into which a gas to be measured is introduced; an oxygen concentration detection cell which generates an output voltage corresponding to oxygen concentration in the measuring chamber and which comprises a plate-shaped first solid electrolyte body and a first pair of electrodes disposed on the first solid electrolyte body, at least a portion of a first electrode of the first pair of electrodes facing the measuring chamber; an oxygen pump cell which comprises a plate-shaped second solid electrolyte body and a second pair of electrodes disposed on the second solid electrolyte body, the oxygen pump cell being laminated on the oxygen concentration detection cell with the measuring chamber intervening therebetween so that at least a portion of a second electrode of the second pair of electrodes faces the measuring chamber, and which oxygen pump cell pumps oxygen into or out of the measuring chamber in accordance with a pump current input thereto such that the output voltage generated by the oxygen concentration detection cell assumes a predetermined target voltage; an insulating layer in which the measuring chamber is formed and which is disposed between the first and second solid electrolyte bodies so as to electrically insulate the oxygen concentration detection cell from the oxygen pump cell; and a leakage section formed primarily of a solid electrolyte material and which electrically connects the oxygen concentration detection cell and the oxygen pump cell, wherein the leakage section faces the measuring chamber.