www.foodengineeringmag.com/articles/89023-photoelectric-sensor
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Photoelectric sensor

January 10, 2012
Featuring a polarized retro coaxial design, the Banner Q26 Series photoelectric sensor provides detection of clear, translucent or opaque objects including mirror-like surfaces. It has a compact cubic shape with 20mm mounting hole spacing for installation in tight locations.

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Banner Engineering Corp.; 888-373-6767; 
www.bannerengineering.com