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Unformatted text preview: ensors are too expensive. Fig. 5.4.1: Detection of black rubber soles © Festo Didactic GmbH & Co. KG • FP 1110 65 5. Capacitive proximity sensors Detecting filling levels of fluids In the case of detecting filling levels of fluids through thin walls of plastic containers, inspection glass etc., the wall thickness must be limited such as to enable the capacitive proximity sensor to respond to the contents alone. a) b) a) Capacitive proximity sensor encapsulated in plastic or quartz glass b) Detection of liquid level through plastic or glass tube Fig. 5.4.2: Detection of filling level inside a steel container 66 © Festo Didactic GmbH & Co. KG • FP 1110 5. Capacitive proximity sensors Detecting filling levels of granular material Capacitive proximity sensors are suitable for the detection of powder, grain or granular type bulk goods through containers or silos. For example, it is possible to check the filling volume inside food containers through the sealed packaging by means of capacitive proximity sensors. The illustration below shows four capacitive proximity sensors at the base of a cardboard box to check that four soft drinks bottles have been inserted. Fig. 5.4.3: Checking of packaging contents through cardboard...
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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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