In this way it is possible to suppress the detection

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Unformatted text preview: om the active surface, • the dimensions of the medium and • the dielectric constant of the medium. © Festo Didactic GmbH & Co. KG • FP 1110 61 5. Capacitive proximity sensors The sensitivity (switching distance) of most capacitive proximity sensors can be adjusted by means of a potentiometer. In this way it is possible to suppress the detection of certain media. For instance, it is possible to determine the fluid level of hydrous solutions through the wall of a bottle. The switching distance of a capacitive proximity sensor is determined by means of an earthed metal plate. The table below lists the variation in switching point distances in respect of different materials. The maximum obtainable switching distance of industrial capacitive sensors is approximately 60 mm. Material thickness [mm] Switching distance [mm] 1.5 – 3.0 0.2 4.5 1.0 6.0 2.0 7.5 2.3 9.0 2.5 10.5 2.5 12.0 2.5 Table 5.1.1: Variation of switching distance as a function of the material thickness using a cardboard strip (width = 30 mm) 62 © Festo Didactic GmbH & Co. KG • FP 1110 5. Capacitive proximity sen...
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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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