Method and apparatus for measuring fluid specific gravity

Details Method and apparatus for measuring fluid specific gravity Method and apparatus for measuring fluid specific gravity

1977-01-13

1978-02-21

Gill, James J.

Measuring and testing

Specific gravity or density of liquid or solid

G01N 900

Patent

active

040745627

ABSTRACT:
A method and apparatus for measuring specific gravity of fluids such as urine. The apparatus includes a housing and a hollow tube mounted in the housing and open at both ends. The housing is adapted for communication with a source of fluid to be introduced into one end of the hollow tube. The housing is also adapted for connection of pressure differential structure to the other end of the hollow tube for causing fluid to flow from the fluid source through the hollow tube. The tube is vibrated with the fluid therein and electronic response means are employed to measure the vibration frequency of the tube and sample therein and compare the measurement with a predetermined reference frequency to determine the specific gravity of the fluid. The forces to vibrate the tube are produced electromagnetically by impressing an alternating current on the tube itself which is located within the field of a magnet. The alternating currents are produced by making the tube a short circuited single turn secondary of a transformer, the primary of which is connected to a source of alternating voltage and current.

REFERENCES:
patent: 2956431 (1960-10-01), Westerheim
patent: 3420092 (1969-01-01), Dorsch
patent: 3444723 (1969-05-01), Wakefield
patent: 3516283 (1970-06-01), Abbotts
patent: 3523446 (1970-08-01), Kratky et al.
patent: 3729982 (1971-09-01), Senda
patent: 3831433 (1974-08-01), Kovacs et al.

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