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Unformatted text preview: . Magnetic proximity sensors Fig. 3.1.4: Examples of magnetic reed switches for detection of cylinder positions ("cylinder sensors") 3.1.3 Notes on application When installing reed type proximity sensors, it is important to ensure that there are no interfering magnetic fields near the sensor exceeding a field strength of more than 0.16 mT (T = Tesla). Should this be the case, then the proximity sensor must be shielded accordingly. If several pneumatic cylinders are fitted with proximity sensors, a minimum distance of 60 mm is required between the proximity sensors and the adjoining external cylinder walls. If these distances are reduced, a shift in switching points will occur. 38 © Festo Didactic GmbH & Co. KG • FP 1110 3. Magnetic proximity sensors With reed sensors, maximum current flow must be reduced. Otherwise this can lead to arc discharge during switching on or off and therefore burning of the contact blades. A resistor fitted in series serves as a current limiter and leads to extended serv...
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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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