Patent ID: 6787014
Filing Date: 2004-09-07
Classification: G01N

Abstract:
A gas-detecting element comprisingan oxygen-ion-conductive solid electrolyte substrate, a sensing electrode fixed onto said solid electrolyte substrate and active with a detection object gas and oxygen, and a reference electrode fixed onto said solid electrolyte substrate and active with at least oxygen, to determine the concentration of said detection object gas from the potential difference between said sensing electrode and said reference electrode, wherein said sensing electrode and/or said reference electrode is covered by an electrode-coating layer made of an oxygen-ion-conductive solid electrolyte, wherein said electrode-coating layer has a portion bonded to said solid electrolyte substrate directly or via an electrode underlayer made of an oxygen-ion-conductive solid electrolyte, and wherein said sensing electrode and/or said reference electrode is fixed onto said solid electrolyte substrate or said electrode underlayer via an electric insulating layer.