When the fluid is flowing through conductive magnetic voltage occurs, the upward trend in the direction perpendicular to the magnetic field. General structure of this type consists of a measuring instrument. The pipe that looks as electrical insulation Posing in the direction perpendicular to the magnetic field intensity of the lines of magnetic force constant and installation, 2-pole electrodes in contact with the liquid flow inside pipes by the end of the 2 electrodes used as measuring voltage, caused by the flow of the liquid.