Fluid quality test method based on impedance
First Claim
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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 independent of said impedance cell and 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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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
22 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 independent of said impedance cell and 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 independent of an impedance measuring cell and 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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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 independent of an impedance measuring cell and based on said first, second and third impedance, and said temperature;
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)
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Specification