Photo Switch 1,Output:NPN or PNP,NO/NC; 2. ... 3 wires; 3.CE certification. SG series Photo Switch,Photoelectrical Sensor 1, Principle:photoelectric sensor makes use ... of inspected object’s sheld and reflection to infrared lights, choose by ... (TC and RTD), Panel Meter, Sensor Meter, inductor, Power Meter, Coulometer, Voltage Meter, Ampere Meter, Counter, Tacho ...