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Capacitive capsule for aneroid pressure gauge

  • US 4,229,776 A
  • Filed: 11/21/1978
  • Issued: 10/21/1980
  • Est. Priority Date: 11/21/1978
  • Status: Expired due to Term
First Claim
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1. An aneroid capsule apparatus for use in a pressure gauge comprising:

  • a first membrane having a peripherally extending side edge region;

    a second membrane having a peripherally extending side edge region and a charge retaining region, said first and second membranes extending substantially parallel to and at a distance from each other and being sealingly engaged to each other along their respective peripherally extending side edge regions to define a sealed interior space between them which is partially evacuated;

    means passing through said first membrane and extending between said sealed interior space and the exterior of said capsule apparatus for supporting a capacitor element within said sealed interior space, said support means being electrically conductive;

    means for mounting said supporting means on said first membrane in electrically insulated relationship thereto for movement therewith; and

    a capacitor element located within such sealed interior space affixed to and supported by said electrically conductive support means in opposed relationship to said charge retaining region of said second membrane,whereby the changes in distance between said first and second membranes resulting from changes in ambient pressure are measured as a function of changes in capacitance of the capacitor plate and opposed charge retaining region of said second membrane.

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