Transducers for hostile environments

Details Transducers for hostile environments Transducers for hostile environments

G - Physics

01

D

73/39

G01D 5/22 (2006.01) G01D 11/24 (2006.01)

Patent

CA 1296918

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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