Apparatus including a capacitive probe for measuring the level a

Details Apparatus including a capacitive probe for measuring the level a Apparatus including a capacitive probe for measuring the level a

1990-05-30

1991-10-01

Cuchlinski, Jr., William A.

Measuring and testing

Liquid level or depth gauge

Immersible electrode type

324688, 73292, 361284, G01F 2326

Patent

active

050522230

ABSTRACT:
The present invention relates to apparatus for measuring the level and/or the volume of liquid contained in the tank. The apparatus being of the type comprising a capacitive probe including at least two generally vertical parallel separate main plates for immersing in the liquid, and capacitance-measuring means having a detection input and a ground, the detection input being connected to a first one of the main plates and the ground being connected to the second main plate, wherein the first plate is surrounded by a guard ring. Furthermore, the present invention measures the level or volume of a liquid by calculating a coefficient K using the expression K=(Cmes-Cair)/(Cimm-Cair); in which Cmes is the measuring capacitance between the first and second plates; Cair is the capacitance of the first plate and the second plate in air; Cimm is the capacitance of the first plate and the second plate when they are totally immersed; and K is defined as the area of the first plate in the liquid divided by the total area of the first plate.

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