Theoretical and experimental determination of cell constants of planar-interdigitated electrolyte conductivity sensors

W. Olthuis, W. Streekstra, P. Bergveld

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    Abstract

    In this paper, an analytical expression is presented for the cell constant of planar-interdigitated electrodes used as electrolyte conductivity sensors. The result of this expression is compared with results of measurement carried out with several differently shaped planar probes provided with a thin Ta2O5 insulating film, showing good agreement. More than 10 different devices have been fabricated with predicted cell constants ranging from 0.14 to 4.44 cm¿1. The measured cell constants are typically 10¿20% smaller, possibly due to fringing effects.
    Original languageEnglish
    Pages (from-to)252-256
    JournalSensors and actuators. B: Chemical
    Volume24
    Issue number1-3
    DOIs
    Publication statusPublished - 1995

    Keywords

    • Cell constants
    • Conductivity sensors
    • Planar-interdigitated electrodes

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