Alternative designation back pressure nozzle 1 2

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Unformatted text preview: k pressure sensors b) Reflex sensors c) Air barriers Fig. 8.1.1: Typical sensing distances of various pneumatic proximity sensors Supply pressure can vary, but is generally in the region of 0 – 800 kPa (0 – 8 bar). The signal pressure generated depends on the supply pressure and the distance between the nozzle and the object. 120 © Festo Didactic GmbH & Co. KG • FP 1110 8. Pneumatic proximity sensors 8.2 Back pressure sensors (Back pressure nozzles) The obstructing of an air jet drilling by means of an object to be detected leads to a signal pressure build-up in the control port to the level of the supply pressure. Alternative designation: Back pressure nozzle 1 2 Supply pressure (1) 1 2 Output pressure (signal pressure) (2) Fig. 8.2.1: Method of operation of back pressure nozzle © Festo Didactic GmbH & Co. KG • FP 1110 121 8. Pneumatic proximity sensors 8.3 Reflex sensors The reflex type of sensor consists of an annular ring jet nozzle and a central receiver nozzle. If an object is moved towards the air escaping from the ring jet nozzle (...
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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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