| 摘要 |
PURPOSE:To improve the measuring precision and the measurement success rate of a probe by mixing an iron oxide beforehand in a coating made of an oxide of a solute element to be measured or a composite oxide containing the oxide of the solute element to be measured. CONSTITUTION:A standard electrode 2 is disposed in contact with a solid electrolyte 1 and a standard electrode lead 3 is taken out, while a coating 4 is disposed on the opposite side of the electrolyte 1 to the standard electrode 2. When the coating 4 comes into contact with a molten metal 5, a layer 6 of local equilibrium being different from the metal 5 is formed. In the layer 6 of equilibrium, an oxide of a solute element to be measured and the solute element to be measured in the molten iron reach equilibrium, and the activity of oxygen in the layer 6 of equilibrium has a value corresponding to the activity of the solute element to be measured in the molten iron. When a difference in oxygen potential between the standard electrode 2 and the layer 6 of equilibrium is measured between the lead 3 and a measuring electrode 7, accordingly, a superpower corresponding to the activity of the solute element to be measured in the molten iron is obtained by a potentiometer 8. |
