Method for measuring the oxygen concentration in gas mixtures

摘要

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 Us is fed. The supply voltage Us is formed from the sum of at least two voltage components Ua and Uv. The first voltage component Ua is kept at a constant predeterminable value which is required for ionizing the free oxygen. The second voltage component Uv is kept variable and its respective value is determined as a function of the magnitude of the probe current Is flowing between the electrodes.