Parkhurst, Wendel & Rossi
Water-proof type oxygen sensor
 A water-proof type oxygen sensor including a sensor element having inner and outer electrodes at inner and outer surfaces, respectively; a metallic cap for housing the sensor element; a gas-tight sealing member provided in the cap for isolating the exhaust gases from the air; communicating openings provided in the cap for communicating a space inside the cap with the air; and a communicating member arranged around the outer periphery of the communicating openings and having gas permeability and water-repellent property. The inner and outer electrodes are adapted to contact with air and exhaust gases. The communicating member is cylindrical and is fixed to the metallic cap through a metallic fixing member having a coefficient of thermal expansion almost equal to that of the metallic cap. 
NGK Insulators, Ltd.
G G
G01N G01N
inventional inventional
Masanori Nobuhide
Katsu Kato