PVEK.305431.13-10-У1 (У2), PVEK.305431.13-20-У1 (У2), PVEK.305431.13-50-У1 (У2) (combined BDC is executed on the basis of the amplified(strengthened) information-warning mark) Is intended for regulation and measurement of a current on size and direction by protection of underground metal pipelines, communications КС, GRС, tanks etc. from electrochemical corrosion, and also by joint protection of two underground communications with various electrical parameters.

(Column of electric chemical defence with a kilometres cover of helicopter inspection)

( for the control of a difference of potentials " object - ground " on pipelines, communications and other structures)