A photoelectric sensor is a device that detects a difference in the light level received from the light source. The sensor is made up of a light source, an amplifier, signal converter, and an output. There are 3 types of photoelectric sensors: thru-beam, retroreflective, and diffused. Each sensor has its own strengths and can be used in a variety of ways. The more automated technology used at manufacturing plants, the more you will use different types of sensors. We have a great selection of infrared motion sensors, proximity sensors and switches, and photoelectric sensor accessories to keep your machinery on track.