초록 ▼

A filter monitoring device for use in monitoring the purity of a fluid through a filter includes a pressure differential sensing device in communication with the filter. The filter monitoring device defines an inlet port which is in communication with the supply of fluid upstream of the filter and a

A filter monitoring device for use in monitoring the purity of a fluid through a filter includes a pressure differential sensing device in communication with the filter. The filter monitoring device defines an inlet port which is in communication with the supply of fluid upstream of the filter and an outlet port which is in communication with a supply of fluid downstream of the filter. The differential pressure sensing device comprises at least one movable device which is in contact with both the upstream and downstream supplies of fluid and moves in response to changes in the pressure differential of the fluid. Different total differential pressures are accommodated by corresponding stiffness of a biasing device. The differential pressure sensing device also comprises a distance sensing device which continuously measures or detects the distance of travel of the movable device. The distance sensing device is operatively connected to at least one indicator device which conveys or transmits the status of the pressure differential of the fluid in the filter assembly.

대표청구항 ▼

A filter monitoring device comprising: a differential pressure sensing means in communication with a fluid being filtered through a filter element in a filter assembly, the differential pressure sensing means including a housing defining a chamber, the housing defining a first differential pressure

A filter monitoring device comprising: a differential pressure sensing means in communication with a fluid being filtered through a filter element in a filter assembly, the differential pressure sensing means including a housing defining a chamber, the housing defining a first differential pressure sensing port which extends through the housing and which is in communication with a first supply of fluid upstream of the filter element, and the housing defining a second pressure sensing port which extends through the housing and which is in communication with a second supply of fluid downstream of the filter element; the differential pressure sensing means including a first movable means which is in communication with the fluid being filtered, the first movable means being axially positioned in the chamber and continuously movable in response to a change in the differential pressure of the fluid in the filter assembly; the differential pressure sensing means further including a distance sensing means for continuously measuring or detecting movement of the first movable means; the distance sensing means being separated from the fluid in the filter assembly and not in contact with the movable means, the distance sensing means being operatively connected to a first indicator means which conveys the status of the differential pressure of the fluid in the filter assembly; the first indicator means providing a substantially continuous supply of data showing any change in the differential pressure across the filter element, whereby the first indicator means detects pressure variances which are due to contaminant buildup and/or changes in the temperature of the fluid being filtered so that the differential pressure sensing means does not falsely indicate a clogged filter element; and, the filter monitoring device further comprising a temperature sensing means for continuously measuring or detecting any change in the temperature of the fluid being filtered, the temperature sensing means being connected to a second indicator means for conveying, the status of the temperature of the fluid in the filter assembly, and providing a substantially continuous supply of data showing any change in the temperature of the fluid, whereby the temperature sensing means substantially eliminating a false pressure change indication due to high viscosity of the fluid when the fluid is at a low temperature.