Series 3131 photoelectric sensors from Contrinex Inc., Old Saybrook, CT, have a 200 mm sensing distance and background suppression that is adjustable in small increments down to 15 mm. Features include a 500 Hz operating frequency, a 30 by 30 by 15 mm package, the ability to sense targets down to 1 mm from the lens, status LEDs, and immunity to color, shape, and surface texture of the background beyond the set target detection point. A red spotlight helps alignment to the target. Sensors are sealed to IP67 and have a stable sensing range from 25°C–55°C.
Background Suppression Sensors from Contrinex