21 technical data of capacitive proximity sensors 53

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Unformatted text preview: sitivity to dirt sensitive Service life very long Switching frequency up to 300 kHz Design cylindrical, block-shaped Size (examples) M12x1, M18x1, M30x1, up to Ø 30 mm, 25 mm x 40 mm x 80 mm Protection (IEC 529, DIN 40050) up to IP67 Ambient operating temperature -25 – +70 °C Table 5.2.1: Technical data of capacitive proximity sensors 5.3 Notes on application 64 As with inductive position sensors, flush and non-flush fitting capacitive proximity sensors are to be distinguished. Furthermore, it should be noted that these sensors can be easily contaminated. Also, their sensitivity with regard to humidity is very high due to the high dielectric constant of water (ε = 81). On the other hand, they can be used for the detection of objects through a non-metallic wall. The wall thickness in this case should be less than 4 mm and the dielectric constant of the material to be detected should be higher by a factor of 4 than that of the wall. © Festo Didactic GmbH & Co. KG • FP 1110 5. Capacitive proximity sensors Due to its ability to react to a wide range of materials, the capacitive proximity sensor can be used more unive...
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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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