... 3 wires,AC 2/3 wires; 3.CE certification. SG series Photo Switch,Photoelectrical Sensor 1, Principle:photoelectric sensor ... and auto protection for production line,serial signal,digital controller,etc.Function and struction can be changed directly with ... can manufacture thousands of different models of products, including Temperature Controller, Digital Adjustor,thermocouple (TC and RTD), Panel Meter, ...