Electronic level switch control setup

Claim 1

A remote control device responding to conditions in a particular locale, comprising an electrically conductive sensor whose level is determined by conditions in the locale, electrical contacts, the sensor having a position in which it will be out of contact with these electrical contacts and another position in which it will be in contact with the electrical contacts, and an electric circuit, said electrical contacts being located to provide a gap in the electrical circuit which said sensor will close in the position in which it is in contact with the contacts, and that circuit including a solid state relay adapted to energize an item being controlled, the solid state relay circuit having a portion including two transistors, another portion including a triac, and an optical coupler between these two portions, and the two transistors each having different parts connected to one of the contacts from those parts which are connected to the other of the contacts, and more specifically one of the there-mentioned transistors having an emitter and a base connected to the first of the contacts and the other having a collector connected to the first of the contacts, while the first-mentioned of the transistors has a collector connected to the second of the contacts and the second-mentioned of the transistors has a base and emitter connected to the second of the contacts, and there being a cross connection between the base of the first-mentioned transistor and the collector of the second-mentioned transistor, and a cross connection between the base of the second-mentioned transistor and the collector of the first-mentioned transistor, and likewise a cross connection between the base and emitter of the first-mentioned transistor and also a cross connection between the base and emitter of the second-mentioned transistor.