To provide a device for monitoring a state of a filter element.
A filter system 10 is a filter assembly 12 including a housing 14, the filter element 16, an inlet passage 18, and an outlet passage 20 extending in the housing; and includes a filter assembly having the outlet passage communicating with the inlet passage via the filter element, and an element state monitoring assembly, that is, the element state monitoring assembly including an inlet pressure transducer 34 communicating with the inlet passage, an outlet pressure transducer 36 communicating with the outlet passage, and a microprocessor linked with the inlet pressure transducer and the outlet pressure transducer. The inlet pressure transducer measures pressure, and the outlet pressure transducer measures pressure. The microprocessor calculates a pressure difference between inlet pressure and outlet pressure, and calculates an element state status, by using at least one element state parameter capable of including the pressure difference.
OLLIS DANNY R
SEMRAD ROBERT E
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