Ifm Electronic Gmbh

Reinhard Teichmann

Robert Buck

Bernd Buck

Joerg Schuetze

An inductive proximity switch with a housing formed of a nonmagnetic, high-grade steel, with a transmitting coil, two receiving coils which are connected in series in opposite directions and which are located symmetrically relative to the transmitting coil, and an evaluation circuit which is connected to the receiving coils. At a given size, the inductive proximity switch has a relatively large operating distance and the operating distance is largely stable, especially is largely independent of temperature, essentially in that, on the back of the receiving coils, opposite the influence side, there is a pre-damping element and the pre-damping properties of the pre-damping element at least approximately correspond to the pre-damping properties of the housing on the influence side.

Inductive proximity switch

An electronic, proximity-type switching device with a first switching device terminal (,), a second switching device terminal (,), a sensor and evaluation circuit (,) which contains an externally influenceable proximity indicator and an operating voltage supply circuit for making available the internally required operating voltage (&equals; internal operating voltage) and with an electronic switch (,) which is controllable by the sensor and evaluation circuit (,), for example, a switching transistor, the sensor and evaluation circuit (,), on the one hand, and the electronic switch (,), on the other, being connected essentially in parallel and to the first switching device terminal (,) and the second switching device terminal (,). To enable the switching device to be used as a normal 2-wire switching device and also as a 3-wire switching device, there is a third switching device terminal (,) and there are a current rise (,) which is active in the conductive state of the switching device and/or a voltage drop or limitation (,) which is active in the blocked state of the switching device between the second switching device terminal (,) and the third switching device terminal (,).

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Amtzell, Germany

Reinhard Teichmann