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Sensors 2015, 15(5), 12080-12091; doi:10.3390/s150512080

Iterative Precise Conductivity Measurement with IDEs

Centre of Sensors, Information and Communication Systems, Faculty of Electrical Engineering and Communication, Technicka 3058/10, Brno 616 00, Czech Republic
Academic Editor: Libuše Trnková
Received: 14 November 2014 / Accepted: 18 May 2015 / Published: 22 May 2015
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Abstract

The paper presents a new approach in the field of precise electrolytic conductivity measurements with planar thin- and thick-film electrodes. This novel measuring method was developed for measurement with comb-like electrodes called interdigitated electrodes (IDEs). Correction characteristics over a wide range of specific conductivities were determined from an interface impedance characterization of the thick-film IDEs. The local maximum of the capacitive part of the interface impedance is used for corrections to get linear responses. The measuring frequency was determined at a wide range of measured conductivity. An iteration mode of measurements was suggested to precisely measure the conductivity at the right frequency in order to achieve a highly accurate response. The method takes precise conductivity measurements in concentration ranges from 10−6 to 1 M without electrode cell replacement. View Full-Text
Keywords: IDEs; electrolytic conductance; specific conductivity; iterative measurement; cell constant correction IDEs; electrolytic conductance; specific conductivity; iterative measurement; cell constant correction
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Hubálek, J. Iterative Precise Conductivity Measurement with IDEs. Sensors 2015, 15, 12080-12091.

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