There are three main types of photoelectric sensors:
- A through-beam unit has a light source and a separate receiver. It looks for the beam between the two to be broken.
- A reflective unit has the receiver in the same unit as the light source and looks for the “bounce-back” of the light off an object.
- Retro-reflective units bounce a light source off a reflector and sense when this beam is broken.
- Sensing of tank or bin level.
- Confirmation of part or object passage.
- Detection presence or absence of object.
- Positioning of work piece.
- Measuring distance.
- Works in harsh environments.
- Detects targets of almost any material.
- Color discrimination capabilities.
- Capable of long detecting distances.
- Can have high accuracy detection.