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Mainsensors Magneto-inductive displacement sensors have a compact design and are suited to mid-to-high volume applications such as those in hydraulics, automotive and off-highway vehicles.

The sensors combine the robustness and proven measurement performance of eddy current sensor technology with the latest printed-coil and permanent-magnet technology.

As well providing a new, simplified displacement-measurement technique, the sensor offers extremely high basic sensitivity and excellent temperature stability (low thermal drift).

Chris Jones, managing director at Micro-Epsilon said: ’Due to simplified electronics, Micro-Epsilon is now able to produce low-cost versions of the sensor with printed circuit boards and basic analogue outputs, or we can combine this version with a microprocessor to create a digital output sensor, including PWM, CANbus and other digital interfaces.

He added: ’Although the new sensor uses a permanent magnet as the target, unlike Hall Effect sensors, it does not suffer from relatively low sensor accuracy or high temperature drift.

Mainsensor uses Micro-Epsilon’s patented measuring method, which is based on a linear relationship between the position of the permanent magnet and the output signal.

Due to its in-house mechanical and electronics manufacturing capabilities, Micro-Epsilon has been able to produce the complete sensor without having to rely on any external sub-component suppliers.

The underlying functioning principle of the sensor is based on a coil, which is supplied with alternating current, resulting in a primary magnetic field.

According to the Maxwell formula, this magnetic field induces eddy currents in the electrically conductive material arranged opposite the coil.

In the field of the eddy current sensor is a film that attenuates the eddy current sensor depending on the strength of the magnetic field.

Using this method, a linear relationship between the distance to the magnet and the output signal can be established.

As printed coils can be used inside the sensor, manufacturing does not rely on any semiconductor processes.

Thomas Birchinger, Mainsensors product manager at Micro-Epsilon said: ’The sensor has an extremely high basic sensitivity, which enables a very simple and consequently low-cost evaluation circuit.

’With an eddy current sensor as the technological core, both very fast and very high-resolution versions of the sensor can therefore be produced.

He added: ’A pulse-width modulated signal is available as an output signal, which can be easily read by a microcontroller using a time measurement.

The first standard industrial sensor in the Mainsensors family is the MDS-40 M30, which has a 40mm measuring range and an M30 cylindrical, barrel-type stainless-steel housing.

The alternative to this is the OEM version, the MDS-40MK, a miniature flat rectangular PCB version with a plastic housing and a 40mm measuring range.

The signal output provides 4-20mA or 2-10V DC.


With over 45 years experience and more than 15,000 customers worldwide, Micro-Epsilon understands the need for accurate, robust, intelligent sensors and measurement systems.

With over 45 years experience and more than 15,000 customers worldwide, Micro-Epsilon understands the need for accurate, robust, intelligent sensors and measurement systems.

If you are measuring any type of displacement / position, temperature, speed or colour parameters, Micro-Epsilon sensors and systems provide market-leading performance, together with the fastest measuring rates, highest operating temperature ranges and smart interface capabilities. From simple, low cost sensors to high volume, customer-specific OEM solutions, Micro-Epsilon will have athe correct measurement solution for your application.

Using both contact and non-contact measurement techniques, Micro-Epsilon boasts one of the largest ranges of displacement sensors including 1D, 2D & 3D laser optical, confocal chromatic, eddy current, capacitive, inductive, draw-wire and time-of-flight technologies. Measuring ranges are from nanometers to kilometers!

For temperature measurement, there is a comprehensive range of non-contact infrared temperature sensors and thermal imaging cameras capable of measuring up to that include intelligent software packages to support configuration, analysis and management during the application. LED analysers, fibre optic sensors and Colour recognition sensors measure true colour using L*A*B and CIE.

Micro-Epsilon sensors are used throughout almost all industries: from automotive to aerospace, motorsport to metal production, semiconductor to subsea. Whether it’s an R&D, test, inspection, OEM or a process control application, Micro Epsilon measurement engineers can provide the right measurement solution.

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