Admittance sensing probe having multiple sensing elements
First Claim
Patent Images
1. An admittance sensing probe adapted to sense the level of materials within a vessel comprising:
- a condition measuring probe electrode comprising a conductive material;
a compensating probe electrode comprising a conductive material;
a conductor connected to one of said electrodes;
conductive shield means interposed between said conductor and said other of said electrodes, said conductive shield means also being interposed between said conductor and said materials within said vessel;
insulating means separating said condition measuring probe electrode, said compensating probe electrode, and said conductive shield means; and
electrical connection means adapted to connect said shield means to circuitry for maintaining the potential of said conductive shield means substantially the same as said compensating probe electrode and said condition measuring probe electrode.
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Abstract
A single, elongated admittance sensing probe element comprises an elongated probe structure including a conductive level measuring probe electrode and a conductive composition probe electrode longitudinally spaced from the level measuring probe electrode closer to one end of the probe. A conductive shield extends between the level measuring and composition probe elements and beyond the composition probe element at the end of the probe. The entire structure is enclosed within an insulating material. In one embodiment, a cylindrical ground electrode or shield is mounted around the probe structure.
26 Citations
26 Claims
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1. An admittance sensing probe adapted to sense the level of materials within a vessel comprising:
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a condition measuring probe electrode comprising a conductive material; a compensating probe electrode comprising a conductive material; a conductor connected to one of said electrodes; conductive shield means interposed between said conductor and said other of said electrodes, said conductive shield means also being interposed between said conductor and said materials within said vessel; insulating means separating said condition measuring probe electrode, said compensating probe electrode, and said conductive shield means; and electrical connection means adapted to connect said shield means to circuitry for maintaining the potential of said conductive shield means substantially the same as said compensating probe electrode and said condition measuring probe electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An elongated admittance sensing probe adapted to sense the level of materials within a vessel comprising:
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a condition measuring probe electrode comprising a conductive material nearer one end of said probe; a compensating probe electrode comprising a conductive material nearer another end of said probe; conductive shield means interposed between said condition measuring probe electrode and said compensating probe electrode; insulating means mutually electrically insulating said condition measuring electrode, said compensating electrode and said shield means; and electrical connection means adapted to connect said conductive shield means to circuitry for driving said conductive shield means at substantially the same potential as said condition measuring probe electrode and said compensating probe electrode. - View Dependent Claims (19)
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20. An elongated admittance sensing probe adapted to sense the level of materials within a vessel comprising:
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a condition measuring probe electrode comprising a conductive material; a compensating probe electrode comprising a conductive material longitudinally displaced from said condition measuring probe electrode; conductive shield means located adjacent one end of said probe and longitudinally displaced from said compensating probe electrode such that said compensating probe electrode is located between said shield means and said condition measuring probe electrode; and insulating means mutually separating said condition measuring probe electrode, said compensating probe electrode and said conductive shield means, said insulating means also separating said materials from said condition measuring said conductive shield means with substantially the same thickness thereof.
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21. An admittance sensing probe adapted to sense the level of materials within a vessel comprising:
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a condition measuring probe electrode comprising a conductive material; a compensating probe electrode comprising a conductive material longitudinally displaced from said condition measuring probe electrode; conductive shield means interposed between said condition measuring probe electrode and said compensating probe electrode; and insulating means mutually separating said condition measuring probe electrode, said compensating probe electrode in said conductive shield means, said insulating means also separating said materials from said condition measuring probe electrode, said compensating probe electrode and said conductive shield means with substantially the same thickness thereof.
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22. An admittance sensing probe adapted to sense the level of materials within a vessel comprising:
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a condition measuring probe electrode comprising a conductive material; a compensating probe electrode comprising a conductive material; a conductor connected to one of said electrodes; conductive shield means interposed between said conductor and said other of said electrodes, said conductive shield means also being interposed between said conductor and said materials within said vessel; and insulating means tightly covering said compensating probe electrode and said condition measuring probe electrode. - View Dependent Claims (23, 24, 25, 26)
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Specification