Investigations of a magnesia-stabilized zirconia solid electrolyte oxygen sensor for oxygen control measurement in liquid lead were carried out. The fluid of Bi/Bi2O3 as a reference electrode and a molybdenum wire as a working electrode to detect the output signal of the sensor were used. The Nernst equation was used to estimate the electromotive force (EMF) values theoretically. The temperatures of liquid lead were 500, 550 and 600 °C. The results showed that the injection gas temperatures did not affect the detected EMF, the sensor responded well to quick changes of oxygen activity in liquid lead, and the discrepancy between the measured and theoretical EMF of the oxygen sensor output signal was higher at 500 °C than at 550 and 600 °C.
