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induSENSOR, EDS
2. Functional Principle, Technical Data
2.1 Measuring Principle
The eddy current long stroke displacement sensors transform a linear motion (for example piston position in
hydraulic cylinders) into a linear, electrical signal. An aluminium tube, moving concentrically around a sensor
rod, is used as target. Energy is transferred from the coil by inducing of eddy currents in the aluminium tube
and it is detuned as a result. The integrated, miniaturized electronics convert the tube position into a linear,
electrical output signal. The eddy current measuring principle works without contact between moving parts
and is therefore free of wear.
0 1/1
4
12
20
Sensor
housing
Sensor rod
Output signal (mA)
Measuring range
1/2
Alu tube
Fig. 1 Measuring Principle of an eddy current long stroke displacement sensor, alu tube at the start of the
measuring range
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