Housing and control circuit assembly with sensing element

Abstract

An electronic limit switch assembly including a sensor and a switching circuit controlled thereby contained in separate molded plastic housings. The sensor housing and the switching circuit housing are secured together with respective mating walls thereof in abutment and electrically coupled by leads protruding through the mating walls and protectively contained in a cavity in the mating wall of the sensor housing. A sensing coil is mountable for side sensing between a side wall of the sensor housing and an interior wall spaced therefrom defining a part of the cavity for side sensing and is also mountable for end sensing against an end wall opposite the mating wall and underlying the interior wall. Elements of the switching circuit are mounted on a printed circuit board and elongate conductive members secured to the board and connected with elements of the circuit protrude through mating holes in the top of the switching housing which function as terminal posts, heat sinks and circuit board mounts. A bulb of an indicator lamp is supported above the circuit board and adjacent a viewing port in the housing top by elongate rigid leads wave-soldered to the board with the other circuit elements. A cover overlying the top is removed for access to screw connectors at the ends of the conductive members. A guide wall overlying the circuit board and underlying the cover extends between a lead passageway at the end of the housing connectable with standard wiring conduit. The guide wall, upon being engaged by the end of a lead inserted through the passageway, guides it to the connectors.