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Open AccessArticle

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
Sensors 2015, 15(5), 12080-12091; https://doi.org/10.3390/s150512080
Received: 14 November 2014 / Accepted: 18 May 2015 / Published: 22 May 2015
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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Hubálek, J. Iterative Precise Conductivity Measurement with IDEs. Sensors 2015, 15, 12080-12091.

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