Fluid quality test method based on impedance
First Claim
1. A system for determining a quality of a fluid, comprising:
- an impedance cell immersed in said fluid;
impedance instrumentation that communicates with said impedance cell; and
a controller that measures a first impedance of said fluid using an electrical signal at a first frequency, measures a second impedance of said fluid using an electrical signal at a second frequency, measures a third impedance of said fluid using an electrical signal at a third frequency, determines a permittivity and a resistivity of said fluid based on said first, second and third impedances and evaluates said quality of said fluid based on said permittivity and said resistivity.
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Accused Products
Abstract
A system for determining a quality of a fluid includes an impedance cell immersed in the fluid and impedance instrumentation that communicates with the impedance cell. A controller measures a first impedance of the fluid using an electrical signal at a first frequency, measures a second impedance of the fluid using an electrical signal at a second frequency and measures a third impedance of the fluid using an electrical signal at a third frequency. The controller determines a permittivity and a resistivity of the fluid based on the first, second and third impedances. The quality of the fluid is evaluated based on the permittivity and the resistivity.
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Citations
23 Claims
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1. A system for determining a quality of a fluid, comprising:
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an impedance cell immersed in said fluid;
impedance instrumentation that communicates with said impedance cell; and
a controller that measures a first impedance of said fluid using an electrical signal at a first frequency, measures a second impedance of said fluid using an electrical signal at a second frequency, measures a third impedance of said fluid using an electrical signal at a third frequency, determines a permittivity and a resistivity of said fluid based on said first, second and third impedances and evaluates said quality of said fluid based on said permittivity and said resistivity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of determining quality of a fluid, comprising:
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measuring a first impedance of said fluid using a signal having a first frequency;
measuring a second impedance of said fluid using a signal having a second frequency;
measuring a third impedance of said fluid using a signal having a third frequency;
determining a permittivity and a resistivity of said fluid based on said first, second and third impedances; and
evaluating said quality of said fluid based on said permittivity and said resistivity. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method of monitoring usage of equipment having a fluid circulated therethrough, comprising:
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determining a permittivity and a resistivity of said fluid;
evaluating a quality of said fluid based on said permittivity and said resistivity; and
determining whether said equipment was improperly maintained based on said quality. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification