Parkhurst, Wendel & Rossi
Oxygen sensor
 In an oxygen sensor having a plate-shaped oxygen sensor element, a measuring electrode on the broader width surface of the plate-shaped sensor element, and a protective cover covering the plate-shape sensor element, wherein the protective cover has gas inlet holes for introducing a gas to be measured therein and guide plates for changing the direction of the flow of a gas to be measured. The gas inlet holes have different spacings compared to each other, the guide plates and the gas inlet holes have different lengths compared to each other in the axial direction of the protective cover, and/or the gas inlet holes have different opening extents compared to each other. Consequently, the oxygen sensor always can provide a homogeneous swirling flow of the gas to be measured in the protective cover as well as precise measurement of the gas and a constant .lambda. controlling point. 
NGK Insulators, Ltd.
G
G01N
inventional
Yasuhiko Nobuhide
Hamada Kato