Photoelectric sensor, or photo eye, is a device used to detect the distance, absence, or presence of an object by using a light transmitter, often infrared, and a photoelectric receiver. They are used extensively in industrial manufacturing. Taiwan Kontec Photoelectric sensor adopts the coaxial reflective type;       emission sources used special Poly-type LED light; and several different light sources for option. Widely used for all kinds of vertical automatic packaging machines, Horizontal packaging machines, all kinds of bag making machines, cutting machine, slitting machine, and printing machines. As a color-coded identification sign, it can precisely control bags' length and auto-correction.