Abstract: A measuring device includes: a first electrode immersed in sample water stored in a measuring tank; a second electrode immersed in the sample water; and a controller that: causes a power source to flow a current through the sample water between the first electrode and the second electrode; detects, based on a first digital signal, an interruption whereby an analog signal fluctuates by no less than a predetermined value; and calculates, based on a second digital signal, a concentration of a measurement target in the sample water. The first digital signal is acquired by sampling the analog signal with a first sampling period. The analog signal is based on the current flowing through the sample water. The second digital signal is acquired by sampling the analog signal with a second sampling period that is longer than the first sampling period.

Abstract: A measuring device includes: a first electrode immersed in sample water stored in a measuring tank; a second electrode immersed in the sample water; and a controller that: causes a power source to flow a current through the sample water between the first electrode and the second electrode; detects, based on a first digital signal, an interruption whereby an analog signal fluctuates by no less than a predetermined value; and calculates, based on a second digital signal, a concentration of a measurement target in the sample water. The first digital signal is acquired by sampling the analog signal with a first sampling period. The analog signal is based on the current flowing through the sample water. The second digital signal is acquired by sampling the analog signal with a second sampling period that is longer than the first sampling period.

Abstract: A holder support part, into which a holder main body part constituting a sensor holder is fitted, is provided to an upper position of two vertically adjacent positions of an axially inboard-side surface of a bottom plate part so as to project. A nut holding part, which holds a nut, into which is threaded a bolt for joining a sensor holder, is provided to a lower position of the two vertically adjacent positions. The holder support part and the nut holding part are apart from each other. The holder support part is configured as a notched cylinder shape having a discontinuous part at a lower part. An upper surface of the nut holding part is configured as a convex curved surface of which a part facing the discontinuous part is positioned at the uppermost part.

Abstract: A holder support part, into which a holder main body part constituting a sensor holder is fitted, is provided to an upper position of two vertically adjacent positions of an axially inboard-side surface of a bottom plate part so as to project. A nut holding part, which holds a nut, into which is threaded a bolt for joining a sensor holder, is provided to a lower position of the two vertically adjacent positions. The holder support part and the nut holding part are apart from each other. The holder support part is configured as a notched cylinder shape having a discontinuous part at a lower part. An upper surface of the nut holding part is configured as a convex curved surface of which a part facing the discontinuous part is positioned at the uppermost part.