INTRODUCTION TO THE CONDUCTIVITY

The conductivity is a characteristic of a liquid only if measured in thermodynamic equilibrium.
To meet this requirement, avoid the application of high voltage electric or extended solicitations. This is not CIS is the case in 60,247 for the measurement of dc resistivity (electrical solicitations to 250 Vmm-1, electrification arbitrary conventional time 1 min).
There is a simple relationship between the dissipation factor as conductivity and permittivity a liquid with no (or negligible) losses dipole, which is the case with most liquid applications electronics:
So

Where

w= 2 f and f is the frequency of stress.
So far the much of any of themprovides the same information about the conduction properties the liquid. In fact, very often in practice there are major discrepancies between the calculated resistivity far from the much with conventional and DC resistivity measured by the recommendations of IEC 60247.
Currently there are new devices for measuring the conductivity in thermodynamic equilibrium. Are able to easily and accurately measure very low values of The characteristics of this new equipment allow measurement of insulating liquids new even at room temperature.

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