Patent ID: 6592732
Filing Date: 2003-07-15
Classification: G01N

Abstract:
A measuring apparatus for measuring NOX and HC components, comprising:a first solid electrolyte layer; a second solid electrolyte layer, said first solid electrolyte layer and said second solid electrolyte layer being laminated without a vacant chamber and gas-permeable electrodes at both sides of said first and second solid electrolyte layers, wherein said first solid electrolyte layer is porous and is configured to remove at least part of oxygen in a gas passing through the first solid electrolyte layer by conducting current, whereby the apparatus is operative to deoxidize or oxidize NOX and HC components to be measured in the gas passed through said first solid electrolyte layer by conducting current to said second solid electrolyte layer, and to measure a concentration of said components based on the current conducted through said second solid electrolyte layer, and wherein said first and second solid electrolyte layer and said gas permeable electrodes constitute a body laminated on a heating device, in which said second solid electrolyte layer is arranged nearer to the heating device than said first solid electrolyte layer, whereby N2 gas or CO2 gas accumulated at one of the electrodes of said second solid electrolyte layer is released from a portion of the electrode exposed to the atmosphere at a side of the laminated body layers, and O2 gas accumulated at another electrode of said second solid electrolyte layer is released from a portion of the electrode exposed to the atmosphere at a side of the laminated body layers.