Measuring and testing – Liquid level or depth gauge – Float
Patent
1987-05-14
1989-12-19
Hail, III, Joseph J.
Measuring and testing
Liquid level or depth gauge
Float
73322, 324208, 336136, 34087031, G01F 2336, G01F 2360, G01F 2372
Patent
active
048874655
ABSTRACT:
A screened inductance level transducer has a drive winding for setting up a drive field, and a sense winding in which voltage is induced in the presence of the drive field. A conductive screen, which may be of stainless steel, is mounted on a float for movement in response to liquid level. In the presence of the screen, eddy currents are generated to establish a counter-field opposing the drive field and to thereby shade the sense winding to vary the voltage induced in it. The screen is contained within a tubular barrier which may also be of stainless steel, and the windings are located outside the barrier. In this way, the region within which liquid level is to be measured is isolated from the environment to the exterior of the unit, thus facilitating its use for recording liquid levels in hostile conditions.
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Bryne John V.
McMullin Francis
Hail III Joseph J.
Kollmorgen Corporation
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