POTENTIAL DIFFERENCE TYPE SENSOR AND POTENTIAL DIFFERENCE MEASURING INSTRUMENT USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a structure of preventing that the adhesion layer being the noble metal membrane substrate of an acting electrode element is exposed to come into contact with a measuring solution to thereby cause the variation of potential when measuring a solution.

SOLUTION: The metal membrane used in the acting electrode element is constituted of a first metal membrane and a second metal membrane and, after the first metal membrane is formed, the exposed surface of the first metal membrane is coated with the second metal membrane having no pinholes. Succeedingly, an oxidation-reduction substance such as a ferrocene derivative or the like is fixed to the surface of the second metal membrane to complete the acting electrode element for a potential difference type sensor.

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