Patented measurement: magneto-inductive sensors for demanding measurement tasks


The mainSENSOR measuring principle from Micro-Epsilon unites the advantages of two sensor types. Based on the combination of inductive sensors and magnetic sensors, reliable and durable sensor solutions for displacement, distance and rotational speed measurements have evolved. In particular, magneto-inductive sensors are used as alternatives to inductive sensors and proximity sensors in process automation, the packaging industry and in machine monitoring. Their favorable price/performance ratio makes them specially suitable for serial applications.

The sensors measure the distance to a magnet which is fixed at the measurement object. A change of distance involves a change of the magnetic flow in the sensor element. A sensor coil detects this change. Due to dependent physical effects, this results in a linear relationship between distance and output signal.

Unlike conventional sensors based on the Hall Effect principle, the mainSENSOR has significantly larger measuring ranges, while providing a continuous, linear output signal and offering more favorable pricing. Compared to conventional inductive sensors, the sensitivity at the end of the measuring range is constantly high. Other features include the high protection class due to the fully metallic housing, a compact design and the option of a flush sensor installation in non-magnetic materials.

Magneto-inductive sensors are an ideal alternative to switches and proximity sensors, as the users can generate as many switching points as they desire from the continuous analog signal. Complex, mechanical adjustments are not required. In addition, only one sensor is needed in order to cover measuring ranges from 20 to 55 mm, as the magnet used defines the measuring range. If a different measuring range is required, the magnet can be easily exchanged without any further calibration.

A special feature is the possibility to measure through non-ferromagnetic objects such as aluminum or stainless steel. In the case of harsh environmental conditions, the sensor can therefore be housed separately from the magnet in a clean environment.

The mainSENSOR is very flexible in terms of its use and so opens up a wide range of measurement tasks. The product range offers industrial standard sensors with stainless steel housings (M12, M18, M30) or a compact, flat plastic housing. For special customer requirements, the PCB and the sensor housing can be adapted for serial applications.

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