Measuring and testing – Liquid level or depth gauge
Patent
1992-09-21
1993-10-05
Yasich, Daniel M.
Measuring and testing
Liquid level or depth gauge
73304R, 324643, G01F 2328
Patent
active
052494632
ABSTRACT:
A water level measurement system for use with a pressurized power plant boiler comprises a tubular pressure vessel for attachment to one end of the boiler such that the water level in the pressure vessel is the same as in the boiler. The pressure vessel has a central rod-like conductor which together with the vessel forms a coaxial RF waveguide. A pair of spaced reference discontinuities are provided in the conductor above the maximum level of the water, so that an RF pulse injected into the waveguide is reflected successively by both discontinuities and the surface of the water. The level of the water can then be determined independently of changes in the dielectric constant of the vapor above it, from the ratio between the time intervals between the first and second reflected pulses and between the first and third reflected pulses. The conductor is mounted at the top of the pressure vessel by way of a pressure seal and a ceramic insulator.
REFERENCES:
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patent: 3703829 (1972-11-01), Dougherty
patent: 3832900 (1974-09-01), Ross
patent: 3853005 (1974-12-01), Schendel
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patent: 4934186 (1990-06-01), McCoy
Richards Paul N.
Willson Jolyon P.
Asman Sanford J.
Schlumberger Industries Limited
Yasich Daniel M.
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