The object should permit only minimum penetration of

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Unformatted text preview: GmbH & Co. KG • FP 1110 77 6. Optical proximity sensors 6.2 Through-beam sensors 6.2.1 Function description Through-beam sensors consist of separately assembled emitter and receiver components whereby wide sensing ranges can be achieved. For the interruption of the light beam to be evaluated, the cross-section of the active beam must be covered. The object should permit only minimum penetration of light, but may reflect any amount of light. Failure of the emitter is evaluated as "object present". Fig. 6.2.1: The principle of the through-beam sensor 6.2.2 Technical characteristics The table below lists the key technical data relating to through-beam sensors. The figures listed in this table are typical examples and merely provide an overview. Parameter Value Object material any, problems with highly transparent objects Operating voltage 10 – 30 V DC or 20 – 250 V AC Range 1 – 100 m (usually adjustable) Switching current (transistor output) 100 – 500 mA Sensitivity to dirt sensitive Service life long (approx. 100 000 h) Switching frequency 20 – 10 000 Hz Designs ge...
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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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