NAEHERUNGSSCHALTER MIT EINER PRUEF- UND AUSWERTESCHALTUNG.

摘要

The oscillator (7) of an inductive proximity sensor is connected directly and via a damping circuit (2) to a control circuit (4) including an integrated circuit (5) and a monostable multivibrator (6), which causes periodic momentary damping of the oscillation. An interfacing network (8) connects the test circuit (1) to the evaluation circuit (3) comprising a load (9), Schmitt trigger (10), protection circuit (11), amplifier (12), transformer (Tr) and relay circuit (13). Two relay contacts (21, 22) connect an AC supply to another load (15). The evaluation circuit (3) produces an address current only for as long as the test circuit (1) proves to be faultless.