The advantages of these proximity sensors are

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Unformatted text preview: was questioned due to the different colours of containers and the contents as well as the risk of contamination. Explain the advantages and disadvantages of ultrasonic proximity sensors as opposed to diffuse optical sensors for an application of this type. © Festo Didactic GmbH & Co. KG • FP 1110 117 118 © Festo Didactic GmbH & Co. KG • FP 1110 8. Pneumatic proximity sensors 8.1 General characteristics With pneumatic proximity sensors the presence or absence of an object is detected by means of contactless sensing with air jets. When an object is present a signal pressure change occurs, which can be further processed. The advantages of these proximity sensors are: • Operational safety in dusty environments • Operational safety with high ambient temperatures • Can be used in areas of explosion hazard • Insensitive to magnetic influences and sound waves • Reliable even in extreme ambient brightness and for sensing of light transparent objects, where optical proximity sensors may not be suit...
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