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Differential pressure gauge for filter

  • US 7,886,610 B2
  • Filed: 08/24/2005
  • Issued: 02/15/2011
  • Est. Priority Date: 07/19/1999
  • Status: Active Grant
First Claim
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1. An apparatus for measuring the differential pressure of fluid in filter, the apparatus comprising:

  • (a) a housing defining a pressure chamber;

    (b) a differential pressure gauge dividing the pressure chamber into first and second chambers, the differential pressure gauge arranged to measure a differential pressure between the first chamber and the second chamber, the differential pressure gauge having an output, the output being a variable signal;

    (c) the differential pressure gauge comprising a magnet emitting a magnetic field and a hall-effect sensor positioned to detect the magnetic field emitted from the magnet the magnet being movable relative to the hall-effect sensor throughout a range of distances, the range of distances including at least one distance corresponding to no pressure differential and a plurality of distances corresponding to a pressure differential; and

    (d) wherein the variable signal correlates to and varies throughout substantially the entire range of distances.

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