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Displacement sensors offer high accuracy, robustness and lower cost

09 January 2012

Micro-Epsilon has extended its mainSENSOR series of magneto-inductive displacement measurement sensors. The latest addition to is a slimline version with an M18 stainless steel housing. The new MDS-45-M18-SA provides a longer measuring range, from 20mm up to 55mm, depending on the size of the magnet. The streamlined design also allows increased frontal pressures of up to 400bar. An additional groove around the housing enables the measuring system to be sealed with an O-ring.

Micro-Epsilon’s mainSENSOR range operates on the magneto-inductive measuring principle. The sensor coil is supplied with alternating current, resulting in a primary magnetic field. 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 special film, which 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. 
 

Although the mainSENSOR uses a permanent magnet as the target, unlike Hall Effect sensors, it does not suffer from relatively low sensor accuracy or high temperature drift. mainSENSORs use Micro-Epsilon’s novel measuring method, which is based on a linear relationship between the position of the permanent magnet and the output signal.
 
As well providing a simplified displacement measurement technique, mainSENSOR also offers extremely high basic sensitivity, excellent temperature stability (low thermal drift) and a maintenance-free, wear-free measurement solution.

 
The mainSENSOR family now includes three standard sensor ranges, including the new slimline MDS-45-M18-SA range.

 
The MDS-45-M30-SA has a 55mm measuring range and an M30 cylindrical, barrel-type stainless steel housing. The sensor weighs just 15g and can operate in temperatures up to 80 deg C. The signal output provides 4-20mA or 2-10V dc.

 
The alternative to this is the OEM version, the MDS-45-K-SA, a miniature flat rectangular PCB version of the sensor with a plastic housing, countersunk M4 screw connection and a 55mm measuring range. Signal output is 4-20mA or 2-10V dc.

 


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