Oxygen sensor of the polarographic type, particularly for use with internal combustion engines

US4292158A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Klaus Muller · Tamm, DE
• Helmut Maurer · Rodenbach, DE
• Hermann Dietz · Gerlingen, DE
• Karl-Hermann Friese · Leonberg, DE
• Wolfgang Leibfried
• Gunther Stecher · Ludwigsburg, DE
• Ernst Linder · Mühlacker, DE

Key dates

• Filing date: Jun 9, 1980
• Grant date: Sep 29, 1981
• Expiry date: Jun 9, 2000

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N33/0011
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

To simplify manufacture and provide a polarographic sensor of high response speed, operating according to the current limiting principle, an oxygen molecule migration barrier is provided leading to the cathode by separating the cathode from the space where the gas to be tested exists by a wall through which a hole is provided which extends therethrough to a small space immediately above the cathode defined by support elements placed immediately on the cathode. The hole, or a plurality of holes, is so dimensioned that the diameter thereof, with respect to its length, is small, with diameters of between 0.01 to 0.06 mm and a length of at least about 1 mm being suitable.