A measurement device 106 fig. 1, 6 is disclosed for measuring the quantity of liquid 105 in a tank, such as an aircraft fuel tank, 100 and the rate of liquid flow from the tank. The quantity of liquid in the tank is determined from a pressure sensor in a liquid outlet pipe 101, which exits the tank at any convenient position, and a pressure sensor for measuring pressure in an ullage space, e.g. at a vent pipe on the tank. The static pressure at reference point R may be calculated. Use of a single differential pressure sensor is also disclosed. Acceleration sensors may be attached to the external liquid outlet pipe 101 and used to compensate the pressure data for effects of gravity, external accelerations and tank orientation. In order to measure rate of liquid flow from the tank, the device 106 may comprise a differential pressure flow meter, such as a venture flow meter, fig. 6. Static pressure sensor(s) 110 at the inlet of the flow meter may be used for both the level and flow measurement.
Liquid measurement device for a tank
2020-01-22
Patent
Electronic Resource
English