Re: Conductivity Sensor

This all sounds a bit hairy, because the capacitance between two
electrodes in a liquid depends on the nature of the ions in the
solution. At audio frequencies the impedance between the electrodes can
be dominated by the Warburg impedance, which has equal resistive and
reactive components, both of which decreases as the square root of the
frequency.

At higher frequencies, the double layer capacitance tends to dominate,
but that varies with the specific ions involved, not necessarily in the
same was as the conductivity.

------------
Bill Sloman, Nijmegen

.

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