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The oscillator coil consists of a ferrite ring core with internal coil. The oscillator is
attenuated as soon as an electrically conductive object enters the ring.
Ring proximity sensors are suitable for instance for contactless sensing of small
metal parts, which are transported via a conveyor tube, whereby the conveyor tube
passes through the ring sensor. Fig. 15.1.9: Ring type proximity sensor Example Proximity sensors with an internal diameter of 10 mm, 15 mm, 21 mm and 43 mm. © Festo Didactic GmbH & Co. KG • FP 1110 237 15. Special designs and variants of proximity sensors 15.1.13 Slot type inductive proximity sensors
Slot proximity sensors are in the shape of a fork, where two oscillator coils are
placed opposite one another. The proximity sensor responds to metallic objects in
the space between the fork, similar to a light barrier sensor. Proximity sensors of
this type are used in applications where constant accurate reproducibility of the
switching point is required even if the line of movement of the object varies slightly. Fig. 15.1.10: Slot type proximity sensors Example 238 Proximity sensors with slot widths of 2 – 30 mm © Festo Didactic GmbH & Co. KG • FP 1110 15. Special designs and variants of proximity sensors 15.1.14 Inductive proximity sensors for broken drill monitoring
Inductive sensors are also available for monitoring drill breakage, whereby drills,
taps or reamers are monitored for fracture during the working process. The princip...
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- Spring '12