Patent ID: 11921079
Assignee: NGK INSULATORS, LTD.
Field: Measurement (Instruments)
Classification: CPC G  Y | IPC G

Claim 0:
1. A gas sensor sensing a sensing target gas component contained in a measurement gas and identifying concentration of said sensing target gas component, said gas sensor comprising:
a sensor element having a central axis and an inlet for said measurement gas on one end portion, and including:
an element base made of an oxygen-ion conductive solid electrolyte;
a heater buried in said element base; and
a porous leading-end protective layer covering a predetermined range of said element base on said one end portion; and

a metallic member within which said sensor element is fixedly disposed, wherein
a minimum distance between said sensor element and an inner surface of said metallic member is 0.20 mm or more and 0.95 mm or less, said inner surface of said metallic member being parallel to said central axis of the sensor element, and
a portion of said inner surface of said metallic member closest to said sensor element and facing said porous leading-end protective layer in a direction perpendicular to said central axis has an arithmetic average roughness of 5 μm or less.