Electrochemical sensor

US6280605A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Olaf Jach · Eppelheim, DE
• Johann Riegel · Bietigheim-Bissingen, DE
• Lothar Diehl · Stuttgart, DE

Key dates

• Filing date: Dec 24, 1998
• Grant date: Aug 28, 2001
• Expiry date: Dec 24, 2018

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N27/417
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An electrochemical sensor measures a gas concentration of a measured gas with an electrochemical element. The electrochemical sensor includes an electrochemical pump cell with a first solid electrolyte body, a first and a second electrode, and a gas chamber, which is connected to a measured gas chamber via a gas inlet opening and in which one of the two electrodes is located. The electrochemical sensor also includes a second solid electrolyte body with an electrochemical sensor cell (e.g., a Nernst cell), which has a third electrode and a reference gas chamber in which a fourth electrode is located, with the electrodes having a supply conductor for electrical contacting. A supply conductor of the fourth electrode is provided with an electrically insulating layer to insulate it against the second solid electrolyte body.