Apparatus for interface measurement in a storage tank

Measuring and testing – Liquid level or depth gauge

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Details

73304R, 324643, 324644, G01F 2328

Patent

active

054006511

ABSTRACT:
An apparatus and method for measuring the water level at the bottom of a storage tank, the water level being the product-water interface between product and water within the storage tank. The apparatus includes a sensor assembly which is located at the tank bottom. The assembly has a plurality of measurement sensors arranged in a housing having slots for product and water to enter and leave the housing. Each measurement sensor is an open-circuited co-axial transmission line with a probe at its open end which functions as a monopole antenna. In preferred embodiments, the transmission lines are quarter wavelength open-circuited coaxial transmission lines. Each probe is located at a different distance from the tank bottom to cover a measurement range. The transmission lines are excited with signals which are reflected by the probes. As the level of the product-water interface changes on the probes, the capacitance of the probes also change which, in turn, change the amplitude or voltage level of the reflected signals. The voltage measurements are converted to level by a microprocessor.

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"Levels Systems," Process Instruments and Handbook, 3rd. Ed., Douglas M. Considine, Ed., McGraw-Hill, pp. 5.44-5.53. (no date).

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