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Unformatted text preview: ensor is fitted with an internal shield, which is insulated from the
housing. The electronic components are encapsulated and a potentiometer is fitted
at the output end for the adjustment of sensitivity.
Usually, proximity sensors include a light emitting diode (LED), which lights up when
the output is switched through. The LED display serves as a means of adjustment
and functional testing. © Festo Didactic GmbH & Co. KG • FP 1110 73 6. Optical proximity sensors 6.1.3 Operating margin for optical proximity sensors
Optical proximity sensors may be exposed to contamination such as dust, splinters
or lubricants during operation. Contamination can cause interference with proximity
sensors. Both contamination of the lens forming part of the proximity sensor optics
as well as contamination of the reflector with retro-reflective sensors and of the
object to be detected in the case of diffuse sensors can cause failure.
Heavy contamination in the light beam of through-beam sensors and retro-refle...
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- Spring '12