Multi-capacitor fluid level sensor

Details Multi-capacitor fluid level sensor Multi-capacitor fluid level sensor

G - Physics

01

F

73/69

G01F 23/26 (2006.01)

Patent

CA 1178457

MULTI-CAPACITOR FLUID LEVEL SENSOR ABSTRACT A tubular shaped fluid level or fluid volume sensor or probe for mounting in a fluid storage vessel for sensing the level or volume of the fluid within the vessel which comprises: a first pair of like elec- trically conductive capacitor elements each formed to present two electrically connected capacitive plate areas, the capacitor elements being spaced from one another and shaped and arranged to generally define together the outer periphery of the tubular sensor; and a second pair of like electrically conductive capacitor elements each formed to present two electrically connect- ed capacitive plate areas, the second pair of capacitor elements being posi- tioned within and spaced from the first pair of capacitor elements and being spaced from one another and shaped and arranged to generally define together the inner periphery of the tubular sensor. Electrical insulating material constitutes means located between the capacitor elements defining the outer periphery of the sensor and the capacitor elements defining the inner periphery of the sensor for mounting the pairs of capacitor elements in fixed spaced relationship from one another and for positioning the elements so that each capacitive plate area thereof defines with a capacitive plate area of the next adjacent capacitor element a dielectric space therebetween so that the mounted capacitor elements together form four like dielectric spaces. Material of known constant dielectric value fills two of the dielectric spaces thereby forming with their respective space -i- defining capacitive plate areas two capacitors of known fixed and substantially like capacitive value. The remaining two dielectric spaces are open to receive varying levels of fluid thereby forming with their respective capacitive plate areas, and the fluid within the spaces, two capacitors of variable capacitive value. The sensor or probe is not limited in its application to fluid level or fluid volume measurements of liquids in vessels and may be used for volume measurement with respect to a wide variety of multi-component systems (including liquid/liquid, liquid/gas, liquid/solid, solid/gas, etc.) as long as the dielectric constants for the two or more components are different. -ii-

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