Capacitive system for manometric detection and measurement of di

Details Capacitive system for manometric detection and measurement of di Capacitive system for manometric detection and measurement of di

1982-06-01

1984-01-03

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

U-tube liquid column

361283, G01L 912

Patent

active

044236387

ABSTRACT:
A manometric method and instrument for the continuous detection and measurement of differential pressures which includes a uniquely configured multi-capacitor sensor system. The sensor system is formed of a first pair of plate type capacitors having like dielectric spaces within which a first strata of fluids is maintained and subjected to one pressure force and a second pair of plate type capacitors having like dielectric spaces within which a second strata of fluids is maintained and subjected to another pressure force. The dielectric spaces of each pair of capacitors are interconnected at their lower ends so that the pairs of dielectric spaces form the legs of a classic U-tube manometer whereby the first strata of fluids and the second strata of fluids assume equilibrium positions within their respective dielectric spaces in relation to the densities of such fluids and the respective applied pressure forces. The pairs of capacitors comprise all of the capacitance elements of an alternating current Wheatstone bridge circuit. Detection and measurement of the current value of the bridge is translated in linear relationship into a differential pressure value between the pressure forces applied to the manometric instrument.

REFERENCES:
patent: 2703876 (1955-03-01), Edmundson
patent: 2746295 (1956-05-01), Lubkin
patent: 3190122 (1965-06-01), Edwards
patent: 3218863 (1965-11-01), Calvert

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