RiKO SU15 U-Shape Photo Sensor Qualified Sensors From Taiwan RiKO High-speed response, 1 kHz (DC-light type). Wide vane, 15 mm (DC-light type). 12-24 VDC. NPN, dark operated (open collector), NPN, light operated (open collector), PNP, dark operated (open collector). Min. dectection object --- Opaque (0.5 x 2.0).