341 schematic representation of hysteresis and

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Unformatted text preview: nd response travel of various cylinders (example) © Festo Didactic GmbH & Co. KG • FP 1110 47 3. Magnetic proximity sensors Permanent magnet (1) Sensor off (4) Hysteresis (H) Cylinder barrel (2) Centre of sensor (5) Response range (S) Sensor on (3) Fig. 3.4.1: Schematic representation of hysteresis and response travel of a magnetic proximity sensors Exercise 3.2 Electrical connection of a reed proximity sensor Describe the behaviour of a reed sensor as shown in Fig. 3.1.2, with the supply voltage being reversed, i.e. polarity reversal of the proximity sensor. Can this damage the reed sensor? Exercise 3.3 Resolution of a reed proximity sensor What is the smallest possible cylinder stroke that can be detected by two reed proximity sensors? Use the technical data in table 3.2.1 and 3.4.1 for your answer. 48 © Festo Didactic GmbH & Co. KG • FP 1110 4. Inductive proximity sensors 4.1 Function description The most important components of an inductive proximity sensor are an oscillator (LC resonant circuit), a demodulator rectifier, a bistable amplifier...
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