Measuring and testing – Liquid level or depth gauge – Hydrostatic pressure type
Reexamination Certificate
2007-08-07
2007-08-07
Williams, Hezron (Department: 2856)
Measuring and testing
Liquid level or depth gauge
Hydrostatic pressure type
C073S29000R
Reexamination Certificate
active
10908768
ABSTRACT:
The weight of liquid in a tank subject to tilting is determined by measuring differences in air pressure in the ullage (the empty volume of the tank above the level of the liquid) and the air pressure produced by the weight of the liquid at the bottom of the tank. The pressures at the bottom of the tank are measured in a plurality of locations, and the differential pressures are combined to compensate for changes in the depth of the liquid when the tank is not level (e.g., when the tank is in an aircraft flying at an attitude other than straight and level). The electronics to measure the pressure and to process the pressure measurements are located remotely form the tanks, thus eliminating the possibility of ignition caused by the electronics when the liquid is fuel or other flammable liquid.
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Gourlay Robert D.
Pagan Daniel L.
Williams Steven C.
BAE Systems Information and Electronic Systems Integration INC.
Frank Rodney
Sewell Jerry Turner
Williams Hezron
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