| 摘要 |
An electrochemical device for measuring the concentration of oxygen in liquid alkali metal is described. Such device includes an elongated probe tube which is designed to be inserted into the liquid alkali metal whose oxygen content is of interest. A cup of a solid electrolyte material is bonded to the tube adjacent its lower end so that the outside surface of its bottom wall is in intimate contact with the liquid metal. The cup contains a mixture comprising a known concentration of one of the free metals gallium, indium and tin, and an oxide of such metal. This mixture is liquid at the temperature of operation of the device and is in intimate contact with the inner side of the bottom wall of the cup to provide a reference electrode. A high impedance volt meter is connected between the reference electrode provided by the mixture and the liquid alkali metal in order to provide a reading indicative of the EMF generated by ionic conduction of oxygen ions through the electrolyte and, hence, of the oxygen concentration in the alkali metal.
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