Versatile cell for complex permittivity measurements on liquids

A disk type guarded measurement cell is described, which permits the determination of the complex permittivity of liquids with an accuracy of 0.5% or better. The cell has small residual circuit elements (4 nH and 20 mΩ) and behaves like an ideal capacitor for radius-to-electrode spacing ratios ranging from 15 to 135. Ruggedness and ease of use are achieved through a split cell design with a minimal number of parts and threads for assembly, as well as the attachment of fluid lines and electrical connections.