Ferromagnetic materials near a magnetic proximity

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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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