Patent ID: 7258483

Claim:
A device for measuring at least one of a level and a temperature of a liquid in a container, said device comprising: a resistor arrangement adapted to be immersed in the liquid, an immersed length of the resistor arrangement in the liquid corresponding to the level of the liquid in said container; the resistor arrangement including upper, middle and lower temperature-dependent elongated resistor elements which are connected in parallel; each said resistor element having an uniform resistance per unit length along a length thereof; the upper and lower resistor elements being shorter than the middle resistor element; a power source having first and second terminals connected to said resistor arrangement; each of said resistor elements having opposite first and second ends, the first ends of said resistor elements being commonly connected to the first terminal of said power source, the second ends of said resistor elements being commonly connected to the second terminal of said power source; a current measuring unit for measuring currents flowing though the resistor elements; and a computer for calculating the immersed length of the resistor arrangement or the temperature of the liquid from predetermined lengths of the resistor elements and the measured currents.