The considered electromagnetic method of measurement of metalline mass provides the control of two parameters of a pulp: its volume flow and its magnetic permeability of a pulp. Accuracy of calculation of mass of a solid phase by an suggested method practically is not influenced by change of physical properties of the liquid and gaseous medium as a part of a pulp. Thanks to it accuracy of measurement of the flow of metalline mass is increasing, necessity for measurement of density of a pulp and of liquid-gas component disappears. Necessity of application of radio isotope densimeter is included. Constructive decisions of the two-channel electromagnetic device with the above-stated properties are considered.