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Unformatted text preview: esigns are available to achieve different height levels,
e.g. from 400 – 1000 mm. Fig. 15.2.6: Safety screen of through-beam sensors © Festo Didactic GmbH & Co. KG • FP 1110 249 15. Special designs and variants of proximity sensors 15.2.9 Dynamic sensors
Standard sensors react to static build-up in the light beam. The switching signal
reacts as long as the build-up is present.
Dynamic sensors, in contrast, react to rapid changes in the emission strength
received. Slow changes such as for instance as a result of gradual contamination or
slowly occurring objects are not registered because the switching threshold in the
receiver is continually adjusted.
Dynamic sensors are often used as thread breakage monitors in the textile industry.
The thread passes through the sensor. A thread breakage creates a slight, brief
change in the light being passed and is detected. Breakages in the finest threads
(e.g. up to 0.05 mm) can be detected. The minimum brightness variation can be
adjusted. 250 © Festo Didactic GmbH & Co. KG • FP...
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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