APG MPR Series Magnetostrictive Level Sensor

The MPR Series Magnetostrictive Level Sensor is a continuous level measurement sensor based on proven magnetostrictive technology. The sensor is comprised of one or two floats, each containing permanent magnets, a stainless steel stem containing a wire waveguide, and an electronics housing. The wire waveguide is made of a ferromagnetic material, which has the unique property of temporarily changing shape in the presence of a magnetic field. As the float travels up and down the stem, its magnet affects the wire waveguide directly beneath. When an electrical pulse is transmitted through the waveguide, the resulting magnetic field interacts with the magnetic field generated by the float. The result is a torsion vibration that travels rapidly through the waveguide. This torsion vibration is detected by the MPR’s microprocessor controlled electronics. The location of the float is precisely measured based on the time elapsed between the transmission of the current pulse and the resulting torsion vibration.

Applications

The MPR series sensors provide a highly accurate and repeatable level readings in a wide variety of liquid level measurement applications. The large, buoyant and robust float of the MPR allows it to be used in harsh applications where fouling or buildup might otherwise be of concern.

Options

By adding a second float, which is designed to sink though oil but float on water, an oil-water interface level can also be tracked and measured. The MPR can also be equipped with an RTD inside the stem to provide temperature readings inside the liquid media.