BMF working principle
Balluff Magnetic Field Sensor is a a magnetic field sensitive measurement. Magnetic fileld sensitive sensors detect an external magnetic field. If the external magnetic field reaches a dedicated level, the trigger activates the output driver.
Magnetoresistance (MR) elements Magneto resisting elements change their electrical resistance under the influence of a magnetic field. So if there is a change of the resistance, the voltage will also change. This change can be measured.