Fluid density transducer

Details Fluid density transducer Fluid density transducer

1980-11-04

1982-10-19

Gill, James J.

Measuring and testing

Specific gravity or density of liquid or solid

G01N 900

Patent

active

043543774

ABSTRACT:
A fluid density transducer with a vibrating tube 16 coupled to excitation pick-up transducers 32 utilizes an elliptical tube 16, having a small degree of ellipticity, to compensate for the variation in the natural frequency of vibration, resulting from a variation in the fluid pressure, i.e. a rise in fluid pressure tending to lower the frequency produces a more circular and hence stiffer tube cross-section tending to increase the frequency. A sealed evacuated chamber 36, formed by connecting together cylindrical nodal masses 24 and 26 using a flexible coupling 28, is used to enclose the vibrating tube 16, thus avoiding the risk of contaminating, and thereby also affecting the calibration of, the tube 16. The tube is supported at each end by a spring plate 12 fixed around its outer periphery to a collar 10 and around its inner periphery to an end-plate 25 of the nodal mass 24 or 26. This provides rigid transverse support and allows use of the transducer in any orientation while accommodating small axial movements of the tube at either end.

REFERENCES:
patent: 3257850 (1966-06-01), Koorman
patent: 3444723 (1969-05-01), Wakefield
patent: 3456491 (1969-07-01), Brockhaus
patent: 3585843 (1971-06-01), Stansfeld
patent: 4007627 (1977-02-01), Stansfeld
patent: 4217774 (1980-08-01), Agar

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