Fuel tank alarm systems

Details Fuel tank alarm systems Fuel tank alarm systems

1974-09-05

1976-06-15

Caldwell, John W.

Communications: electrical

Systems

Call station

73 32R, 73304C, 340236, G08B 2100

Patent

active

039640370

ABSTRACT:
A fuel tank alarm system comprises three density sensors disposed at different heights within a fuel tank. An electrical density signal produced by the lowest sensor is subtracted from the corresponding signals from the upper two sensors to produce two density-difference signals which are then compared with a reference signal. When an inverse density gradient of dangerous proportion exists in the fuel tank, one or both of the density-difference signals exceeds the reference signal in magnitude and an alarm circuit is actuated. The alarm circuit can automatically start a pump to circulate fuel in the tank and reduce dangerous density inversion of fuel therein.

REFERENCES:
patent: 3801902 (1974-04-01), Horowitz

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