Measuring and testing – Liquid level or depth gauge – Immersible electrode type
Patent
1987-08-14
1992-09-01
Will, Thomas B.
Measuring and testing
Liquid level or depth gauge
Immersible electrode type
361284, 338 38, G01F 2326
Patent
active
051429098
ABSTRACT:
A system for indicating level of material in a vessel comprising a probe which includes a plurality of electrically discrete probe elements of electrically conductive construction position within a material vessel in a spaced array extending height-wise of the vessel. Each probe element has electrical characteristics which vary as a function of proximity of material thereto within the vessel. In one embodiment, the probe elements comprise capacitive elements responsive to varying dielectric characteristics as material approaches each element. In another embodiment, having particularly utility in fuel level sensing applications, the probe elements comprise resistance elements responsive to cooling through immersion in fuel for varying voltage drop thereacross. Electonic circuitry is coupled to the several probe elements for detecting material level as a function of electrical characteristics of the probe elements. Preferably, such level detection is accomplished in discrete steps corresponding to separation between probe elements.
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