Method for measuring the oxygen concentration in gas mixtures

US4472247A · kind A · utility

Assignee

• Brown, Boveri & Cie AG · DE

Inventors

• Franz-Josef Rohr · Weinheim, DE
• Henner Meinhold · Sandhausen, DE

Key dates

• Filing date: Dec 19, 1983
• Grant date: Sep 18, 1984
• Expiry date: Dec 19, 2003

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N27/4065
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Method for measuring the free oxygen concentration in gas mixtures, especially combustion gases, with an electrochemical measuring device which comprises an oxygen ion-conducting solid electrolyte and two electrodes to which the supply voltage U.sub.s is fed. The supply voltage U.sub.s is formed from the sum of at least two voltage components U.sub.a and U.sub.v. The first voltage component U.sub.a is kept at a constant predeterminable value which is required for ionizing the free oxygen. The second voltage component U.sub.v is kept variable and its respective value is determined as a function of the magnitude of the probe current I.sub.s flowing between the electrodes.