Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Reexamination Certificate
2005-03-01
2005-03-01
Deb, Anjan (Department: 2858)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
C324S553000
Reexamination Certificate
active
06861851
ABSTRACT:
A method for determining quality and condition of a highly resistive fluid in transportation and industrial equipment. The method uses apparatus that applies a multitude of oscillating voltage signals at determined frequencies and offsets to electrodes immersed in the fluid and quantifies fluid response to the signals. The method monitors response of the fluid to a preferred three fixed electrical signals applied by the apparatus, a high and a medium frequency signal with zero offset voltage and a low frequency signal with an offset voltage. For apparatus or applications where the monitored fluid is not controlled to constant temperature, the method includes correcting the temperature sensitive fluid responses for temperature variations for the fluid quality and condition determination. The method can also include determining when essentially complete fluid exchanges are made to the equipment without need for additional input.
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Corresponding PCT International Publication No. WO2004/036210 A1 published Apr. 29, 2004 and Search Report.
Boyle Frederick P.
Lvovich Vadim F.
Skursha David B.
Benson Walter
Deb Anjan
Esposito Michael F.
Gilbert Teresan W.
The Lubrizol Corporation
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