Measuring and testing – Fluid pressure gauge – U-tube liquid column
Patent
1990-09-27
1992-08-18
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
U-tube liquid column
73304R, 73708, G01L 718, G01L 900
Patent
active
051388863
ABSTRACT:
An electronic manometer for measuring pressure differentials between first and second outlets of a U tube supporting a column of mercury. The U tube includes for each arm a coaxial feedline which is terminated by the column of mercury. The coaxial feedlines are connected to first and second oscillators where they serve as the frequency determining circuit element of the oscillators. The wavelength of each oscillator frequency of oscillation is directly proportional to the height of the mercury column. A frequency counter and computer are connected to measure this wavelength, and apply any necessary corrective factors to the measurement.
REFERENCES:
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patent: 3908129 (1975-09-01), Akers
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patent: 4495807 (1983-02-01), Field et al.
patent: 4631960 (1986-12-01), Wogerbauer
patent: 4739663 (1988-04-01), Peterson
patent: 4872483 (1989-10-01), Shah
"Mercury Barometers and Manometers" by W. G. Brombacher et al., Commerce, Natl. Bur. of Standards, May 20, 1960.
"Studies and Research Concerning BNFP, RF Level Measurement Evaluation" by H. Tilley, Sep. 1980, Allied-General Nuclear Services (p. 5).
"A Reliable Automatic Liquid Nitrogen Filling System" D. A. Landis et al., IEEE 1986.
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