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This circuit was originally designed to monitor the level of liquid natural gas in a
tank but it can be used to also measure almost any liquid. Two custom insulated metal
tubes form a capacitor plate. The capacitance between the two tubes increases as the
level of the liquid rises. The circuit converts an increase of capacitance into a
positive voltage change. The circuit could be changed to handle almost any scale
factor needed.
Click
on Drawing Below to view PDF version of Schematic
