Photoelectric sensors detect changes in light, consisting of a light source, receiver, a signal convertor, and an amplifier. The receiver (a phototransistor) reads incoming light to confirm that it comes from the sensor’s own lighting component (usually LED). When confirmed, the sensor triggers a pre-defined response.
From this simple concept, photoelectric sensors are incredibly useful for a broad range of industrial safety and automation processes. Seven sensing modes cover the majority of sensing applications, each addressing unique challenges in detecting photoelectric variation.
Read about the seven sensing modes and what sensors are right for your application: