Slot Type Photoelectric Sensor, 30mm, NPN/PNP

A slot-type photoelectric sensor forms a U-shaped structure with an emitter and receiver to detect the presence or absence of objects. The emitter typically uses an infrared LED, while the receiver employs a phototransistor or phototransistor. When an object enters the slot, it blocks the light beam, preventing the receiver from detecting the light signal and thereby altering the output state. The sensor determines whether an object has passed based on this change in light obstruction and restoration, making it highly suitable for counting, limit detection, and position recognition.

Common outputs for slot-type photoelectric sensors include logic level output, NPN output, PNP output, and analog output. Logic level output is suitable for simple on/off detection. NPN and PNP outputs are used for interfacing with industrial equipment and should be selected based on the input type of the PLC or controller. Selection should be determined by the input method, voltage requirements, and response speed of your control system.

Due to the compact design and high sensitivity of slot-type photoelectric sensors, they are commonly used for object presence detection, positional changes, or edge detection. Typical applications include printer paper detection, 3D printer limit switches, production line material counting, robotic limit positioning, label detection, and assembly line part sorting.