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.