The engineer confirms that the proximity sensors have

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Unformatted text preview: sence of an object, it switches off. The object in question is a burnished steel part. How can this behaviour be explained? Exercise 6.5 Electrical connection of proximity sensors In a factory, a number of optical proximity sensors have failed for unknown reasons when installed. The engineer has no experience in dealing with proximity sensors, therefore wrong connection cannot be ruled out. On the other hand, short-circuit proof and reverse polarity protected proximity sensors have been used. The engineer confirms that the proximity sensors have been connected to a power supply of 24 V DC. The power supply unit which has been fitted has a filter circuit (inductance and filter capacitor), but without electronic control. What, in your opinion, are the reasons causing the failure? © Festo Didactic GmbH & Co. KG • FP 1110 101 6. Optical proximity sensors Exercise 6.6 Measurement of filling level by means of optical proximity sensors This illustration shows an application where an optical proximity sensor is used for liquid level measurement. 1. Which types of optical proximity sensor are to be considered for thi...
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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.

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