PBB - 

Multi-Beam® Series
The Multi-Beam series is a modular design and is one of the industry’s most flexible and versatile sensor families with over 5,000 custom configurations. They are available in opposed, retro-reflective, diffuse, convergent and glass fiber optic sensing modes. Flexibility is enhanced thanks to the interchangeable ac or dc power blocks plus the additional choice of 2, 3 or 4-wire sensor blocks. A wide selection of sensing ranges is also available up to a maximum of 200 meters. Should the application require output timing controls then a choice of output timing logic modules are available. For more specialized applications they also feature ambient light receivers, optical edge transmitters and optical edge guides.