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Unformatted text preview: sensors Fig. 3.2.2: Response characteristics of an inductive-magnetic proximity sensor 3.2.3 Notes on application
It should be noted that with the application of inductive-magnetic proximity sensors
the proximity sensor may show an asymmetrical switching behaviour. Therefore it
should be checked that the sensor switches reliably in the actual circumstances.
Ferromagnetic materials near a magnetic proximity sensor may lead to changes in
characteristics or to interference, the same as when these sensors are used under
strong external magnetic field influence such as in welding plants or aluminium
smelting works, for instance.
When several pneumatic cylinders are fitted with magnetic proximity sensors, a
minimum distance of 60 mm is required between the proximity sensors and the
nearby external wall of the cylinder.
Inductive-magnetic proximity sensors generally have a built-in protective circuit for
connecting inductive loads as well as against voltage spikes. An additional
protective circuit is therefore superfluous. 44 © Festo Didactic Gm...
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- Spring '12