Gas sensor element
AssigneeDenso Corporation
InventorsMakoto Ito, Takehiro Watarai
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Abstract
A gas sensor element includes a main body having a solid electrolyte body on which a measurement gas-side electrode and a reference gas-side electrode are provided, a trap layer covering an outer peripheral surface of the main body to trap poisoning substances contained in a measurement gas, and a waterproof protective layer covering an outer peripheral surface of the trap layer. In the protective layer, there is formed at least one measurement gas introduction port for introducing the measurement gas to the measurement gas-side electrode via the trap layer.
Claims6
A gas sensor element comprising:
- a main body including a solid electrolyte body having oxygen ion conductivity, a measurement gas-side electrode provided on one surface of the solid electrolyte body and a reference gas-side electrode provided on the other surface of the solid electrolyte body;
- a trap layer formed of a porous material and covering an outer peripheral surface of the main body, the trap layer allowing a measurement gas to permeate therethrough while trapping poisoning substances contained in the measurement gas;
- and
- a protective layer covering an outer peripheral surface of the trap layer and having a water-impermeable property and a porosity of 5% or less, wherein
- in the protective layer, there is formed at least one measurement gas introduction port for introducing the measurement gas to the measurement gas-side electrode via the trap layer.
A gas sensor element comprising:
- a main body including a cup-shaped solid electrolyte body having oxygen ion conductivity, a measurement gas-side electrode provided on an outer peripheral surface of the solid electrolyte body and a reference gas-side electrode provided on an inner peripheral surface of the solid electrolyte body;
- a trap layer formed of a porous material and covering an outer peripheral surface of the main body, the trap layer allowing a measurement gas to permeate therethrough while trapping poisoning substances contained in the measurement gas;
- and
- a protective layer covering an outer peripheral surface of the trap layer and having a water-impermeable property and a porosity of 5% or less, wherein
- in the protective layer, there is provided at least one measurement gas introduction port for introducing the measurement gas to the measurement gas-side electrode via the trap layer, and
- the at least one measurement gas introduction port is formed to penetrate the protective layer and located to have the trap layer interposed between the at least one measurement gas introduction port and the measurement gas-side electrode.
Dependencies are inferred from the claim text.