Patent ID: 9297741
Filing Date: 2016-03-29
CPC Classification: G01N

Claim Text:
1. A sensor device comprising: a first electrode including a first metallic material, the first metallic material being a metallic material in which either a first passivation film forms on a surface thereof or the first passivation film present on the surface thereof is lost, in association with changes in the pH of a measurement site; a second electrode including a second metallic material different from the first metallic material, the second electrode being spaced apart from the first electrode, the first electrode and the second electrode being provided on the same plane; a coating film including a third metallic material different from the first metallic material and from the second metallic material, the coating film covering at least one of the first electrode and the second electrode; and a functional element configured to measure a difference in electric potential between the first electrode and the second electrode that changes depending on presence or absence of each of the first passivation film and the coating film in association with the changes in pH.