Magnetostrictive level probe Operating principle The operation of Magnetostrictive Level Probe is based on the principle denominated Wiedemann effect and allows a continuous and highly accurate reading of the level of liquids inside a tank. The level transmitter XMT consists of an electronic circuit with microprocessor located in the head and of a stainless steel rod housing a wave guide located inside the tank. A high frequency electric impulse is generated by the electronic device. In the exact point of intersection with the magnetic field generated by the permanent magnet housed in the float, a mechanical impulse caused by the magnetostrictive torsional deformation is generated. The mechanical impulse travels at the speed of sound in the wave guide up to the detector located in the measuring housing. By measuring of the time elapsed between the sending of the initial signal and its return the exact position of the floats along the rod is defined with 0,01 mm. resolution.