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Unformatted text preview: y opposite a receiver nozzle, it is possible to
construct an air barrier (analogous to a through-beam sensor) which is interrupted
by an object. With this type, it is also possible for an air jet to be interrupted by an
opposite air jet instead of an object. This is known as an interference jet barrier.
Distances of up to 100 mm can be spanned by air barriers.
Simple air barriers, where the air escapes from the sender only, are subject to dirt
collecting in the receiver nozzle, because the flow of air collects dirt particles from
the surrounding area. This can lead to a malfunction or a total breakdown due to
blockage. 1 1 1 2 1 a) b) Supply pressure (1) Output pressure (signal pressure) (2) a) Receiver nozzle
b) Emitter nozzle Fig. 8.4.1: Method of operation of an air barrier © Festo Didactic GmbH & Co. KG • FP 1110 123 8. Pneumatic proximity sensors Most air barriers on the market operate on the principle of the deflecting jet,
whereby air escapes on both sides of the barrier. The function of the re...
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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.
- Spring '12