1、When the container liquid level is too low, the low liquid level alarm signal sent by the low liquid level sensor is triggered, and the C352 controller is triggered to close the relay to start the water pump.2、When the liquid level reaches a certain height, the high liquid level sensor sends a signal to trigger the C352 controller to disconnect the relay and automatically stop the pump.3、Thereby, the function of automatic control of the container liquid level is realized, and the container liquid level is kept stable.4、Applications: Automatic water replenishment for water tanks, buckets, water towers, intelligent water pump solenoid valves, fish tank live water control, automatic pumping of household water wells, automatic industrial equipment level monitoring.5、Small size, low power consumption, anti interference, high functional stability, easy to install.