Through beam photoelectric switch is composed of a light emitter and a light receiver, and the detection distance can be increased by separating the light emitter and the light receiver. Its detection distance can reach several meters or even tens of meters. When in use, the light-emitting device and the light-receiving device are respectively installed on both sides of the passing path of the detection object. When the detection object passes through, the light path is blocked, and the light-receiving device acts to output a switch control signal.

