A constant air jet is emitted by the sender the

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Unformatted text preview: sender), an excess pressure builds up in the central nozzle (receiver nozzle) when the object is at a certain distance from the ring jet. Fig. 8.3.1 provides a schematic representation of the air flow. 1 2 Supply pressure (1) 1 2 Output pressure (signal pressure) (2) Fig. 8.3.1: Method of operation of a reflex sensor The reflection of the air jet on an object to be detected creates a signal pressure build-up in the control port relative to the sensing distance and supply pressure. The reflex sensor is typical of this design. A reflex sensor generally consists of a sender and receiver nozzle arranged concentrically. A constant air jet is emitted by the sender. The approach of an object towards the reflex sensor influences this air jet and a back pressure (reflex) builds up in the receiver nozzle, which can be evaluated as a signal (output 2). Alternative designation: Reflex nozzle 122 © Festo Didactic GmbH & Co. KG • FP 1110 8. Pneumatic proximity sensors 8.4 Air barriers By placing a ring jet nozzle directl...
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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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