Patent ID: 8763455

Claim:
A method for measuring the levels of first and second liquids in a container wherein the first liquid lies below the second liquid, said method comprising the steps of: locating a plurality of resistors that are interconnected to one another in electrical series inside a probe such that said resistors extend longitudinally through said probe; dipping the probe into the liquids to be measured so that said plurality of series connected resistors extends from at least the top of the second liquid to the bottom of the first liquid; creating a first current path through a first number of said plurality of series connected resistors which lie between the bottom of the container and the interface of the first and second liquids; creating a second current path through a second number of said plurality of series connected resistors which lie between the top of the container and the top of the second liquid; measuring the total resistance of said first number of said plurality of resistors within said first current path; and measuring the total resistance of said second number of said plurality of resistors within said second current path.