The WORLD-BEAM Q20FF fixed-field sensors rely on visible red, fixed field background suppression for greater reliability and operate over a range up to 6” (150 mm). The Q20 series offers a range of sensors in standard rectangular housings with 1” (25.4 mm) mounting-hole spacing. Models are available with 2”, 4”, or 6” sensing ranges. Additional features include IP67/NEMA 6 and NEMA PW12 1200 PSI wash-down ratings and dc operation from 10 to 30 Vdc with complementary solid-state outputs. BANNER ENGINEERING CORP., Minneapolis, MN. (888) 373-6767.