GAS SENSOR ELEMENT AND GAS SENSOR

摘要

A first electrode (133) has an exposure portion (133b) exposed to a second measuring chamber (160), and a connection portion (133d) which is disposed at a position not exposed to the second measuring chamber (160) and is connected to the first lead (137) and which is a portion of the first electrode (133) located most distant from the second measuring chamber (160). The entire connection portion (133d) is located in a region A1 which extends from the second measuring chamber (160) over a distance of 1.0 mm or less.

主权项

1. A gas sensor element comprising:
a platelike solid electrolyte body having oxygen ion conductivity; an oxygen-permeable first electrode provided on a front or back surface of the solid electrolyte body; an oxygen-impermeable first lead connected to the first electrode; an oxygen-permeable second electrode provided on the front or back surface of the solid electrolyte body; and a measuring chamber which is disposed in opposition to the first electrode and into which gas to be measured is introduced; and configured such that oxygen ions stemming from NOx contained in the gas-to-be-measured introduced into the measuring chamber move from the measuring chamber to a destination located externally of the measuring chamber through the solid electrolyte body, whereby a current corresponding to the concentration of oxygen stemming from the NOx flows between the first electrode and the second electrode; wherein the first electrode has an exposure portion exposed to the measuring chamber, and a connection portion which is disposed at a position not exposed to the measuring chamber and is connected to the first lead and which is a portion of the first electrode located most distant from the measuring chamber, and the entire connection portion is located in a region which extends from the measuring chamber over a distance of 1.0 mm or less.