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An apparatus comprising a probe having an oxygen ion conductive solid electrolyte layer, a potentiometer and a DC power source connected to the probe. The probe comprises a porous and electronically conductive reference electrode layer on one side of the solid electrolyte layer, a similar measuremen

An apparatus comprising a probe having an oxygen ion conductive solid electrolyte layer, a potentiometer and a DC power source connected to the probe. The probe comprises a porous and electronically conductive reference electrode layer on one side of the solid electrolyte layer, a similar measurement electrode layer on the other side of the electrolyte layer and a separation layer of an inactive material on the outer side of the reference electrode layer. The separation layer or the solid electrolyte layer, or both, has a porous structure and is formed such that the reference electrode communicates with an exterior atmosphere only through this porous structure, while either the separation layer or the electrolyte layer serves as a substrate of the probe. During measurement, the DC power source keeps a current flowing through the electrolyte layer between the two electrode layers to maintain a reference oxygen partial pressure at the interface between the electrolyte layer and the reference electrode layer.

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An apparatus for measurement of oxygen concentration in a fluid, comprising: a probe comprising a layer of an oxygen ion conductive solid electrolyte, a porous and electronically conductive reference electrode layer formed on and in intimate contact with one side of the solid electrolyte layer, a po

An apparatus for measurement of oxygen concentration in a fluid, comprising: a probe comprising a layer of an oxygen ion conductive solid electrolyte, a porous and electronically conductive reference electrode layer formed on and in intimate contact with one side of the solid electrolyte layer, a porous and electronically conductive measurement electrode layer formed on and in intimate contact with the other side of said solid electrolyte layer and a separation layer of an electrochemically inactive material formed on and in intimate contact with the outer side of said reference electrode layer, at least one of said solid electrolyte layer and said separation layer having a porous structure permeable to fluids and being formed such that said reference electrode layer communicates with an exterior atmosphere only through said porous structure, one of said solid electrolyte layer and said separation layer being so shaped and sized as to serve as a structurally basic member of said probe; a meter connected to said reference electrode layer and said measurement electrode layer for measuring an electromotive force generated by said probe; and a DC power source connected to said reference electrode layer and said measurement electrode layer to continuously apply a DC voltage across said solid electrolyte layer thereby to maintain a reference oxygen partial pressure at the interface between said solid electrolyte layer and said reference electrode layer.