Measuring and testing – Liquid level or depth gauge – Immersible electrode type
Patent
1979-09-28
1981-04-21
Goldberg, Gerald
Measuring and testing
Liquid level or depth gauge
Immersible electrode type
73149, G01F 2326
Patent
active
042625319
ABSTRACT:
A system for indicating the mass of fuel in several fuel tanks of an aircraft has a capacitive depth sensor and a permittivity cell located in each tank. Signals from the sensors and cells are supplied to a computing unit which computes the volume of fuel in each tank and its approximate density. The system has a densitometer and another permittivity cell which receive a sample of all the fuel supplied to the tanks, and supply output signals to the computing unit. The computing unit derives a correction factor by comparing an approximate value of density derived from the other permittivity cell with a more accurate measure of density derived from the densitometer. The correction factor is used to correct the approximate values of density derived from the permittivity cell in each tank. A correction factor is calculated in respect of every batch of fuel supplied to the tanks and a combined correction factor is calculated for the mixture in each tank, from the volumes and respective correction factors of the constituent fuels.
REFERENCES:
patent: 3037385 (1962-06-01), Franzel et al.
patent: 3112647 (1963-12-01), Sontheimer
patent: 3596517 (1971-08-01), Ryder
patent: 3620080 (1971-11-01), Ryder
patent: 3728897 (1973-04-01), Wallman
Hewitt Martin
Sinclair David
Goldberg Gerald
Roskos Joseph W.
Smiths Industries Limited
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