... trouble rate under 0.5% 3.Strong anti-interferen Infrared Level Sensor,Elevator Photoelectric SwitchProduct Items: SUNNY SN-GDC-1 Super ... and manufactured by Shanghai Sunny Elevator Co.,Ltd, adopt infrared detection technology to make the response time in microsecond class ... Hitachi,Otis, Mitsubishi, Guangri Elevator etc.Other Photoelectric Switches Infrared Level Sensor,Elevator Photoelectric Switch