Horiba Advanced Techno, Co., Ltd.

Kentaro Inoue

Riichiro Suzuki

Hiroko Kizaki

Hidekazu Takahashi

In order to avoid an electrode from disturbing a flow of a fluid in a flow channel in case that the electrode of an electric conductivity meter is arranged in the flow channel, the electric conductivity meter comprises two tubular electrodes inside of each of which respectively formed is an inner flow channel where the fluid flows, and an electrode holder that communicates each of the inner flow channels of the two electrodes and that holds the two electrodes. The electrode holder holds the two electrodes by making an engagement with each outer peripheral surface of mutually facing axial direction end parts of the two electrodes.

Electric conductivity meter

In order to improve measurement accuracy by accurately calibrating sensitivity of a dissolved oxygen meter without impairing easiness in calibration, the present invention includes a dissolved oxygen measuring device that includes a cell to be loaded with a sample solution, and a dissolved oxygen meter that is attached to the cell and measures an oxygen concentration in the sample solution; and a mode switching mechanism to switch between a measurement mode, in which a sensor surface of the dissolved oxygen meter is substantially in contact with the sample solution in the cell, and a calibration mode, in which the sensor surface is substantially not in contact with the sample solution in the cell, by feeding air into the cell through a feed port disposed on the cell, and by discharging part of the sample solution through a discharge port disposed on the cell.

Dissolved oxygen measurement system and method of calibrating dissolved oxygen meter

A measuring device comprises a guard electrode that is arranged around a cathode, reduces oxygen that is not from an oxygen permeable membrane, and inhibits the oxygen from reaching the cathode. The guard electrode is electrically connected to an anode through a resistor having a prescribed resistance.

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Kyoto, Japan

Kentaro Inoue