Non-Electrically Invasive Liquid Level Measurement

ABSTRACT¹

Liquid level measurement in aircraft, automobiles, boats and other vehicles has historically been measured by either of two methods, resistance float or capacitance probe. In each of these techniques the fuel tank and its contents are subject to electrical energy in the measuring technique. Recently there have been serious concerns due to unexplained aircraft losses, which may have been caused by electrical equipment inside the fuel tank. A new transducer based upon a sensor utilizing anisotropic magnetoresistance properties measures the position of a float, thus the quantity of fuel in the tank, with no electrical items or electrical power in contact with the liquid fuel inside the tank