... SN-GDC-1 photoelectric switch has some features such as wide range of operation voltage, protection of power polarity ... hermetic structure to be impeccable in IP protection class such as lightproof, waterproof, dustproof and diamagnetism. Output signal has ... our company. Our long –time clients include Hyundai (served as OEM), Hitachi,Otis, Mitsubishi, Guangri Elevator etc.Other Photoelectric Switches ...