Sensor

Details Sensor Sensor

G - Physics

01

F

324/44, 73/69

G01F 23/26 (2006.01)

Patent

CA 1294793

ABSTRACT OF THE DISCLOSURE Sensor for an apparatus for measuring the level and/or the quantity of a liquid medium in a vessel, comprising a carrier, said carrier being adapted for mounting in the wall of said vessel; a first pipe of extended length fastened to said carrier, said first pipe being electrically conductive and serving as a capacitor electrode; a spiral winding of extended length of electrically conductive material, and spiral winding being concentric with said first pipe and electrically insulated therefrom, said winding forming the second electrode of a capacitor; connecting means for connecting said winding and said pipe to external circuitry, said spiral winding having a variable pitch along its length including alternately increasing and decreasing portions along the length of said spiral winding, the portions of said winding having increased pitch being located at preselected positions along the length of said spiral winding, the capacitance of said capacitor being subject to continuous increase when said sensor becomes progressively submerged lengthwise in said medium, said capacitance increasing in step- like fashion, that is, at a higher rate, when as the liquid level rises to and submerges said portions of said winding with higher pitch.

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