Parkhurst, Wendel & Rossi
Waterproof type oxygen sensor
 A waterproof type oxygen sensor including a sensor element having electrodes on inner and outer surfaces, respectively, a housing for housing the sensor element, a gas-tightly sealed section arranged inside the housing for isolating the exhaust gases from air, and a water-repelling communicating section for communicating the air inside the gas-tightly sealed section with surrounding air. The inner and outer electrodes are adapted to contact air and exhaust gases, respectively. In the oxygen sensors, Y.gtoreq.10X.sup.0.35 in which X and Y are a value obtained by expressing the gas-tightness of the gas-tightly sealed section as an amount of a gas passing the gas-tightly sealed section and an amount Y of a gas passing the communicating section, respectively. 
NGK Insulators, Ltd.
G
G01N
inventional
Nobuhide Masanori
Kato Katsu