We previously proposed (Gourdin-Bertin, S.; Chassagne, C. J. Chem. Phys. 2016, 144(24), 244501) a simple theoretical model to account for the evolution of the conductivity with the dielectric permittivity, in non-polar media. In this article, we validate experimentally the theory for the case of an ionogenic species kept at constant chemical potential (i.e. in equilibrium with a non dissolved salt, in contrast to previously published conductivity measurements done as function of various fully dissolved salt concentrations). To our knowledge, it is the first time that this type of experiments has been done explicitely.