Before we dive into the specifics of the various functions of photoelectric sensors, it is helpful to understand why photoelectricity works well for sensors. While proximity sensors and other devices may also be used to detect objects and surfaces, they are limited in their ability to detect certain objects like metals. On the other hand, photoelectric sensors have virtually no restrictions on the objects they are able to sense and some have the ability to detect objects up to 10 meters away. Furthermore, photoelectric sensors are quick, high-resolution sensors that make non-contact sensing easy and low-risk.
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