The filtration and separation process is used to achieve a variety of objectives. In hydraulic, lube, and fuel systems, filtration is perceived as the primary means of contamination control. In the following discussion, separation of solid particulate contaminants from a carrier fluid for the purpose of controlling contamination is being considered. The recently developed Dynamic Filter Efficiency (DFE) concept reveals certain characteristics of filters that are undetectable by other test methods and have not been recognized until now. Using conventional testing methods the ability of the filter to remove contaminants from the fluid appears to be level, or improving, throughout the useful life. DFE, on the other hand, shows that a whenever filter is exposed to transients inherent in normal operations, increasing amounts of contaminants are released throughout the service life. Consequently, during transients, components in the system are exposed to continuously escalating contamination levels.
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