... NPN or PNP,NO/NC selectable. 2011--SL/SC series Proximity Sensor(Inductance & capactitive) Features:1, High frequency response ... paper-making, light industry, etc..2, SL series is inductance proximity switch, mainly for inspection of metal objects. Round ... standard cable and interface, various dimensions available3, SC series is capacitive proximity switch,universal inspection for metal, plastic, glass, ...