Apparatus using a feedback network to measure fluid pressures

Details Apparatus using a feedback network to measure fluid pressures Apparatus using a feedback network to measure fluid pressures

1995-01-12

1997-02-18

Chilcot, Richard

Measuring and testing

Volume or rate of flow

Using differential pressure

73718, G01L 900, G01F 134

Patent

active

056043155

ABSTRACT:
An apparatus is disclosed for measuring the pressure of a liquid column enclosed within a pressurized tank or cell, and for deriving the height and/or density of the liquid column based on the measured pressure. The apparatus includes a first pressure sensor for differentially measuring the pressure within the cell relative to a reference pressure at a first height, and further includes a second pressure sensor for differentially measuring the pressure within the cell relative to a reference pressure at a second height. A feedback network is operative to match the reference pressure to the pressure within the cell at one of the first and second heights. The feedback network ensures that the sensor detecting the one region is maintained at a zero or null differential pressure condition, enabling the use of a small dynamic range sensor.

REFERENCES:
patent: 4358814 (1982-11-01), Lee et al.
patent: 4434664 (1984-03-01), Antonazzi
patent: 4457179 (1984-07-01), Antonazzi et al.
patent: 4561307 (1985-12-01), Smith
patent: 4765945 (1988-08-01), Walleser

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