Rectangular 50 x 50 x 20mm photoelectric sensors from Wenglor include diffuse with background suppression, retroreflective, retroreflective for transparent objects, and through-beam models. The popular size makes these sensors ideal for drop-in replacement of other higher-cost rectangular photoelectric sensor brands. Sensing ranges vary from 1200mm for background suppression sensors to 20m for through-beam models. Wenglor rectangular photo sensors provide long range and small spot diameter, simple potentiometer sensitivity adjustment, visible red-light emission, and are compatible with the IO-Link open-standard protocol. Outputs are LO/DO (light-on/dark-on) complementary NO/NC. Right-angle fixed and swivel mounting brackets are available for flexible mounting options. Starting at $69.00 , OPT series photoelectric sensors are UL/CE approved and have a 1-year warranty.