Iterative Precise Conductivity Measurement with IDEs

Sensors

Jaromír Hubálek¹ 

[1] Centre of Sensors, Information and Communication Systems, Faculty of Electrical Engineering and Communication, Technicka 3058/10, Brno 616 00, Czech Republic; E-Mail

关键词: IDEs;    electrolytic conductance;    specific conductivity;    iterative measurement;    cell constant correction;   

DOI  :  10.3390/s150512080

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.