Sensor element
AssigneeNGK Insulators, Ltd.
InventorsKaoru Shibutani, Ryo Onishi
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Abstract
Provided is a sensor element for use in measurement of the concentration of a predetermined gas component in a measurement target gas. The sensor element includes a plate-shaped element body and a protective layer. The element body includes a solid electrolyte layer having oxygen ion conductivity and a heater configured to heat the solid electrolyte layer. A protective layer is formed on at least one face of the element body. A surface of the protective layer has a surface roughness Ra of 8 μm or less and a surface waviness Wa of 6 μm or more.
Claims13
A sensor element for use in measurement of a concentration of a predetermined gas component in a measurement target gas, the sensor element comprising:
- a plate-shaped element body including a solid electrolyte layer having oxygen ion conductivity and a heater configured to heat the solid electrolyte layer;
- and
- a protective layer formed on at least one face of the element body,
- wherein a surface of the protective layer has a surface roughness Ra of 8 μm or less and a surface waviness Wa of 6 μm or more.
Dependencies are inferred from the claim text.