6
Structure-borne sound wave
7
Position magnet
The device operates on the magnetostrictive measurement principle that records the
actual path of a position magnet:
The radial magnet field (1) generated by the current pulse (4) interacts with the magnet
field (2) of the position magnet (7).
As a result of the interaction of the two magnet fields, a wave (ultrasonic) (6) is pro‐
duced in the magnetostrictive sensor component (3). This travels to the converter (5)
and the sensor electronics produce an electrical output signal.
The time interval between the current pulse and the detection of the structure-borne
sound wave is measured and enables the precise position of the magnet – which
changes as the cylinder moves – to be determined. As this measurement principle does
not require a reference point, no recalibration is necessary for this type of device.
The device is also maintenance-free as a result of the non-contact measurement.
3
PRODUCT DESCRIPTION
10
T E C H N I C A L I N F O R M A T I O N | MAX48
8021473/2017-08-08 | SICK
Subject to change without notice
