Abstract: A filtration system includes a variable speed pump having a direct current motor in communication with a source of fluid to be filtered, and a filter assembly having in communication the variable speed pump and with the source of fluid, such that the source of fluid, the variable speed pump and the filter assembly define a kidney-loop filtration circuit in which the fluid is circulated and filtered. A control circuit in communication with the direct current motor varies a voltage supplied to the direct current motor such that the speed of the direct current motor is variable and consequently the flow of fluid through the variable speed pump and through the filter assembly is variable between 0.05 gpm and 0.45 gpm. The direct current motor draws current and produces an output of less than 0.10 hp.

Abstract: A method and apparatus for maintaining the rate of flow of hydraulic or lubricating fluid through a particle contamination sensor or monitor at an acceptable level is disclosed. The rate of flow may be a specific value or lie within a desired range of values. Regardless, maintaining the rate of flow at an acceptable level improves the accuracy of information produced by the contamination sensor or monitor. A display for displaying the particle information created by a particle contamination sensor or monitor in a manner more easily understood by maintenance personnel and a method of creating such a display is also disclosed.

Abstract: A method and apparatus for maintaining the rate of flow of hydraulic or lubricating fluid through a particle contamination sensor or monitor at an acceptable level is disclosed. The rate of flow may be a specific value or lie within a desired range of values. Regardless, maintaining the rate of flow at an acceptable level improves the accuracy of information produced by the contamination sensor or monitor. A display for displaying the particle information created by a particle contamination sensor or monitor in a manner more easily understood by maintenance personnel and a method of creating such a display is also disclosed.

Abstract: A method and apparatus for maintaining the rate of flow of hydraulic or lubricating fluid through a particle contamination sensor or monitor at an acceptable level is disclosed. The rate of flow may be a specific value or lie within a desired range of values. Regardless, maintaining the rate of flow at an acceptable level improves the accuracy of information produced by the contamination sensor or monitor. A display for displaying the particle information created by a particle contamination sensor or monitor in a manner more easily understood by maintenance personnel and a method of creating such a display is also disclosed.

Abstract: A method and apparatus for maintaining the rate of flow of hydraulic or lubricating fluid through a particle contamination sensor or monitor at an acceptable level is disclosed. The rate of flow may be a specific value or lie within a desired range of values. Regardless, maintaining the rate of flow at an acceptable level improves the accuracy of information produced by the contamination sensor or monitor. A display for displaying the particle information created by a particle contamination sensor or monitor in a manner more easily understood by maintenance personnel and a method of creating such a display is also disclosed.

Abstract: A filtration system (10) for removing contaminants from a fluid is provided. The system includes a housing (44) having a convex shaped base (78) and a top (84), with filter media (46) disposed within the housing. The filter media may take the form of a roll having a first end formed by edges of the wound filter media and convex in shape. The system may further include a seal (56) adapted to impede channeling of the fluid in proximity to the core through substantially sealing annuluses formed between adjacent wraps of filter media by engaging the edges of the filter media in proximity to the core without substantially radially displacing the filter media. A fluid passageway may pass through the housing, wherein the passageway (20, 24, 40, and/or 42) is sized sufficiently small in cross-sectional area to substantially impede the flow of fluid through the passageway due to gravity.