BZJ series color code sensor applies the light emitting and receiving principle. It will send out modulating light, receive the reflecting lights from detected object, and distinguish the color or recognize the existence of objects according the intensity of the receiving signals. It can serve for sensor in the automatic control systems for packing machinery, printing machinery, texture and paper making machinery, ect and be used with other instruments to detect the existence of the object marked with color code, pattern code, line or others. It has the functions of self-locating, recognizing colors, rectifying deviation, pattern checking and countering. The sensor applies optical technique, semi-conductor electronic technique, and modulation demodulation, and has the features of high sensitivity, quick response speed, strong anti-background interference, compact structure and convenient operation.