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Unformatted text preview: scription Inductive-magnetic
proximity sensors These proximity sensors, similar to inductive proximity sensors, have a built-in
oscillator (LC oscillating circuit). In contrast to inductive proximity sensors, however,
the oscillating coil is not of a half-shell core design creating a magnetic field directed
outwards, but a coil with a closed-shell core design, e.g. a coil with a shielded ferrite
core. With the approach of a permanent magnet, the core material of the oscillator
coil is saturated, thereby causing a variation in the oscillator current of the proximity
sensor. A trigger stage evaluates the change and converts it into a defined output
signal. These proximity sensors only react to magnetic fields, but not to any metallic
With these proximity sensors, the direction of the magnetic polar axis in comparison
with the proximity sensor axis must be taken into consideration. 1
3 2 LED display on the reverse side (1) Cable or plug-type connection (2) Active surface (3) Fig. 3.2.1: Inductive-magnetic proximity sensor Magnetoresistive
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This note was uploaded on 11/01/2012 for the course CHEMICAL 102 taught by Professor Jamesrodriguez during the Spring '12 term at Universidad Politécnica de Cartagena.
- Spring '12