However an externally active magnetic field leads to

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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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