Patent ID: 9719957
Date: 2017-08-01
CPC Classifications: G01M,G01N,Y02A

Claim:
1. A gas sensor element comprising: a plate-like first solid electrolyte body having oxygen ion conductivity; an oxygen-permeable first electrode provided on a front or back surface of the first 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 first solid electrolyte body; and a first 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 first measuring chamber move from the first measuring chamber to a destination located externally of the measuring chamber through the first 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 first measuring chamber, and a connection portion which is disposed at a position not exposed to the first measuring chamber and is connected to the first lead and which is a portion of the first electrode located most distant from the first measuring chamber, and the entire connection portion is located in a region which extends from the first measuring chamber over a distance of 1.0 mm or less.