Parkhurst & Oliff
Electrochemical oxygen sensor
 An oxygen sensor includes a planar oxygen sensing element having an oxygen detecting portion located in the vicinity of one end thereof, and a protective covering encloses the sensing element to protect the detecting portion in particular. The detecting portion has an oxygen detecting member exposed to a measurement gas. The sensing element has opposite primary surfaces having a larger area than other surfaces thereof, and the detecting member is disposed on the side of one of the primary surfaces. The protective covering has apertures for allowing the measurement gas to flow through a wall of the protective covering so that the detecting member is exposed to the measurement gas. The apertures are formed through a part of the wall of the protective covering which does not face the above-indicated one primary surface of the planar sensing element. 
NGK Insulators, Ltd.
G G
G01N G01N
inventional inventional
Takao Nobuhide
Murase Kato