LIQUID LEVEL CONTROL WITH CAPACITIVE SENSORS

摘要

The present invention is a liquid level control system for selectively activating and deactivating a pump according to the liquid level indicated by capacitive sensors. Activating circuitry starts the pump motor when both upper and lower sensors indicate the presence of liquid. The pump motor continues operation until both of the capacitive sensors indicate the absence of liquid, in which case the pump is shut off. The circuitry of the present invention operates reliably over a wide range of operating conditions.