Exercise 42 258 detection of vibrating steel

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Unformatted text preview: e which is not too small. In addition, a greater nominal switching distance facilitates the adjustment of the proximity sensor on the transporting device. In the case of specified built-in diameters, the greatest switching distance is achieved if a non-flush fitting type of proximity sensor is used. In this case, however, care must be taken to ensure that the active zone of the proximity sensor is free of metal. © Festo Didactic GmbH & Co. KG • FP 1110 257 d d F2 16. Solutions d a) F3 d F2 F1 b) a) Flush mounted b) Non-flush mounted Diameter of proximity sensor (d) Nomial switching distance (sn) Free zone 1 = 3 x sn (F1) Free zone 2 ≥ 3 x sn (F2) Free zone 3 ≥ 2 x sn (F3) Fig. 16.3.2: Installation specifications for proximity sensors Hysteresis is the term used to describe the difference between the switch-on point and the switch-off point of a proximity sensor. This is essential to guarantee the safe switching of the proximity sensor. Should the two switching points coincid...
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