| 摘要 |
PURPOSE:To improve the measurement accuracy of a conductivity sensor which measures the conductivity of an object solution by providing the conductivity sensor with an electric field spread preventing means at the periphery of electric field application electrodes. CONSTITUTION:The couple of electric field application electrodes 24 and 25 are embedded in the center parts of disks 22 and 23 made of insulating materials, both disks are supported by support members 30 and 31, and their internal surface space is used as a distribution space 33 for the solution to be measured. The insulating parts at the peripheries of the electric field application electrodes 24 and 25 prevent an electric field from spreading out when the electric field is applied to the electrodes 24 and 25. The electric field spread preventing means may be an electric field control electrode arranged by the electric field application electrodes at distance. Thus, the electric field spread preventing means is provided at the peripheries of the electric field application electrodes and then the electric field is applied to only the part of the object solution concentrically, so the conductivity is accurately measured.
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