Liquid level control with capacitive sensors

Details Liquid level control with capacitive sensors Liquid level control with capacitive sensors

G - Physics

05

D

G05D 9/12 (2006.01)

Patent

CA 2097118

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 is latched on by the activating circuitry and continues operation until the lower capacitive sensor indicates the absence of liquid, in which case the pump is shut off. A high frequency oscillator operates reliably over a wide range of operating conditions to maintain relatively constant charging time for the capacitive sensors.

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