KS-10 type gate opening sensor (gate sensor) is aimed at the characteristics of gate measurement, using photoelectric absolute value type or mechanical encoder, which is made of precise speed change mechanism inside. The output signal has parallel gray code, serial RS485, 4-20mA standard analog in a variety of ways for the user to choose. The sensor has the advantages of easy installation, strong adaptability, stable and reliable. It integrates detection and A/D conversion, and has the function of power off memory. It is suitable for measuring the lifting height of all kinds of gates (flat gate, arc gate, miter gate, gantry crane, bridge machine, etc.). Its function, characteristics, reliability and so on by the vast number of water conservancy and Hydropower Engineering and technical personnel trust and praise.