Device for measuring the level of a liquid in a container

Details Device for measuring the level of a liquid in a container Device for measuring the level of a liquid in a container

1979-09-13

1981-11-10

Goldberg, Gerald

Measuring and testing

Liquid level or depth gauge

Thermal type

G01F 2324

Patent

active

042991269

ABSTRACT:
A device for measuring the fill level in a container at least partially filled with a liquid, particularly for determining the liquid level in a fuel tank, in which a measuring resistor, comprising a metallic resistance layer having a great temperature coefficient of the specific resistance is carried by a carrier foil. The portion of the resistance layer disposed in the liquid remains cold, while that portion above the liquid is at a higher temperature, whereby the difference between the present resistance and that of an empty tank is proportional to the fill level within the tank. The change of resistance preferably is measured in connection with that of a comparator resistor which is not heated and compensates for temperature influence etc. An influence on the measurement due to convection in the fuel tank is prevented by means of covering sheets which are spaced a small distance from the resistors by means of suitable spacing strips.

REFERENCES:
patent: 3485100 (1969-12-01), Petersen
patent: 3921450 (1975-11-01), Pfister

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