Sensor element including an air introduction portion with a cross section having specified aspect ratio and area and sensor including the same

摘要

Disclosed is a sensor element for detecting a specific gas component in a gas under measurement. The sensor element is plate-shaped in a longitudinal direction thereof and has a detection portion located on a front end side of the sensor element and an air introduction portion adapted as a longitudinal hole extending in the longitudinal direction to a position of the detection portion so as to introduce air thereinto. The detection portion includes a measurement electrode exposed to the gas under measurement, a reference electrode arranged in the air introduction portion and a plate-shaped solid electrolyte member held in contact with the measurement electrode and the reference electrode. The air introduction portion has a cross section with an aspect ratio of 0.0082 to 0.0800 and an area of 0.015 to 0.147 mm2 when taken perpendicular to the longitudinal direction at a position of the reference electrode.

主权项

1. A sensor element for detecting a specific gas component in a gas under measurement, the sensor element having a plate shape extending in a longitudinal direction thereof and comprising:
a detection portion located on a front end side of the sensor element; and an air introduction portion adapted as a longitudinal hole having an opening and extending in the longitudinal direction from the opening to a position of the detection portion so as to introduce air thereinto through the opening, the detection portion including a measurement electrode exposed to the gas under measurement, a reference electrode arranged in the air introduction portion and a plate-shaped solid electrolyte member held in contact with both of the measurement electrode and the reference electrode, wherein a cross section of the air introduction portion taken perpendicular to the longitudinal direction at a position of the reference electrode has an aspect ratio of 0.0082 to 0.0800 and an area of 0.015 to 0.147 mm2.