Electrochemical measuring cell

US4233142A · kind A · utility

Assignee

• Brown, Boveri & Cie AG · DE

Inventors

• Franz-Josef Rohr · Weinheim, DE
• Hubert Holick · Lampertheim, DE

Key dates

• Filing date: Aug 22, 1978
• Grant date: Nov 11, 1980
• Expiry date: Aug 22, 1998

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N27/4076
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An electrochemical measuring cell for determining the oxygen content in exhaust gases from internal-combustion engines and combustions having an ion-conducting solid electrolyte with a measuring electrode as a first layer on the solid electrolyte and a reference electrode as a second layer on the solid electrolyte. A third layer coats the first layer measuring electrode and contains a material with a high partial oxygen pressure to obtain a characteristic U=f(.lambda.) which has a small slope in the range of the air number of about 1; a material with a medium partial oxygen pressure to obtain a characteristic with a medium slope; and a material with low partial oxygen pressure to obtain a characteristic with a steep slope.