FG series Summary FG series photoelectric relays use optical sensors to monitor environmental sunlight. They are usually used in gardens, streets or shop windows. They open the lighting system after dark and close after daybreak. The photoelectric cell sensor is a CdS photoresistor covered with a sealed case. The resistance of the photoresistor varies according to the light intensity. If the brightness value is lower than the set lux value, the relay will open the output after the specified delay time.
