A conductance cell of which the electrodes are provided with a 110 nm thick Ta2O5 insulating film is proposed and realized. The stable and very low impedance of the total oxide/solution interface largely reduces interference from redox processes. Measurement results, given as an output voltage between 10 and 600 mV as a function of the specific resistance between 0.1 and 8 k¿, are shown to be in agreement with theoretically calculated results, both at the constant current and constant voltage mode of operation.
Olthuis, W., Volanschi, A., Volanschi, A., Bomer, J. G., & Bergveld, P. (1993). A new probe for measuring electrolytic conductance. Sensors and actuators. B: Chemical, 13(13), 230-233. https://doi.org/10.1016/0925-4005(93)85368-K