The „Main Sensor“ combines the advantages of inductive sensors and magnetic sensors. It measures the distance to a magnet that is attached to the measuring object. The movement of the magnets causes the magnetic flow in the sensor element to change, which is detected by the sensor coil. The result is a linear relationship between the distance and the output signal. Depending on the strength of the magnets used, the sensors can measure between 20 and 55 mm. The advantage over inductive sensors is that the high sensitivity remains constant, even at the end of the measuring range, and that the sensor can be flush mounted in non-ferromagnetic materials. For linear measurements, the magneto-sensitive sensors are a good replacement for switches and proximity sensors. Unlike sensors used in conventional measuring methods, the Main Sensor can take measurements through conductive, non-magnetisable materials, such as stainless steel and aluminum. This is advantageous in applications with closed systems or housing as the sensor and magnet can be installed physically apart from one another. Other advantages over magnetic sensors according to the manufacturer are the greatly increased measuring range, the continuous output signal, and benefits regarding pricing for large measuring ranges. The sensor is also more robust in the case that the magnet is offset from the axis. The applications range from individual applications in classical machine engineering and measurements in the automation sector to price-sensitive large-volume production. Examples listed by the manufacturer are the detection of foreign bodies in blister machines for tablet packaging and rotational speed measurements.
Micro-Epsilon, Ortenburg, Germany, phone +49 (0) 8542 168–0
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