Transparent very bright or shiny objects may remain

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Unformatted text preview: nsor Disadvantages of retroreflective sensors 6.3.3 Notes on application • Enhanced reliability because of permanent light during non-operation. • Simple installation and adjustment. • Object can be diffuse reflecting, mirroring or transparent as long as a sufficiently high percentage of the light is definitely absorbed. • In most cases, a greater range in comparison with diffuse sensors. • Transparent, very bright or shiny objects may remain undetected. © Festo Didactic GmbH & Co. KG • FP 1110 83 6. Optical proximity sensors Notes • In the case of transparent objects, the light beam passes the object twice and as a result is attenuated. It is possible to detect objects of this type by means of an appropriate potentiometer setting. • Reflecting objects must be arranged in such a manner to ensure that the reflection does not hit the receiver. • With particularly small objects, an orifice in the light beam can improve the effectiveness. • Failure of the emitter is evaluated as "object present". • Reflectors can deteriorate with age and dirt;...
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