Carlo Gavazzi PD112CNB25BPM1 Photoelectric Sensors Diffuse-reflective Photoelectric Sensor with Adjustable Background Suppression, Range: 0-2500mm, Infrared modulated light 850nm, Power Supply 10-30VDC, PNP/NPN Output, N.O. and N.C., light and dark switching, M12 connection, 112x45x25mm housing