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Unformatted text preview: hen three
switching zones are created for small switching distances, a main switching range
plus two minor switching ranges. Minor switching ranges occur due to the magnetic
reversal effects of the switching reeds when entering the magnetic field (Fig. 11.2.6). Polar axis vertical to switching reed plane Fig. 11.2.5: Switching ranges of a reed switch in relation to the magnetic pole axis S
N Polar axis parallel to switching reed plane Fig. 11.2.6: Switching ranges of a reed switch in relation to the magnetic pole axis 170 © Festo Didactic GmbH & Co. KG • FP 1110 11. Physical fundamentals Inductive-magnetic
proximity sensors Similar to inductive proximity sensors for the detection of metals, the oscillation
status of an electronic oscillator is evaluated as a binary signal. The difference as
opposed to a "purely" inductive proximity sensor lies in the fact that the coil of the
oscillator is shielded so that no electromagnetic field is emitted. However, an
externally active magnetic field leads to additional magnetisation of the core
material. This causes th...
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- Spring '12