Conductivity sensor, measuring device, and measuring method

Abstract

The present invention provides a conductivity sensor that allows the inside of the liquid reservoir to be easily filled with the test solution when the entire liquid reservoir is immersed in the test solution. [Solution] In the conductivity sensor, the liquid containment section comprises a cylindrical side wall with a first end in the height direction open, and a bottom wall that closes the second end of the side wall in the height direction and to which a plurality of electrodes are fixed. Each of the plurality of electrodes is formed to extend in the extension direction and is arranged in a direction perpendicular to the extension direction. The plurality of electrodes comprises a first external electrode and a second external electrode to which a voltage is applied, and a first internal electrode and a second internal electrode positioned between the first external electrode and the second external electrode to detect the voltage. The side wall comprises a first opening at the first end that opens the inside of the liquid containment section to the outside, and a second opening at the second end that is closed by the bottom wall. All of the plurality of electrodes are positioned inside the second opening and inside the first opening when viewed in the height direction.

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