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Pressure measuring apparatus

  • US 4,395,915 A
  • Filed: 08/16/1982
  • Issued: 08/02/1983
  • Est. Priority Date: 10/06/1981
  • Status: Expired due to Fees
First Claim
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1. A pressure transducer, comprising:

  • a body having first and second spaced-apart sides and a first chamber therebetween;

    a first pressure sensing diaphragm connected to and extending across said first chamber to form a fluid-tight cover at said first side;

    first means for respectively applying a fluid at first and second pressures to said first and second sides to cause a resultant differential pressure to be applied across said first diaphragm;

    a beam having first and second ends with said first end being connected to said body between said first and second sides;

    second means coupling said beam to said first diaphragm for producing a movement in said beam in response to the differential pressure applied across said first diaphragm;

    a first plurality of strain gauges attached to said beam for deflection therewith, and responsive to the movement of said beam in response to the differential pressure applied across said first diaphragm, for providing a first output signal proportional to said differential pressure;

    a second pressure sensing diaphragm disposed within said body, and having a front side exposed to one of said first and second pressures, and a back side fixedly attached at its periphery to said body to form a second chamber between said back side and said body, said second chamber containing a predetermined reference pressure; and

    a second plurality of strain gauges selectively positioned on said second diaphragm for deflection therewith and responsive to the differential between the pressure to which said front side is exposed and said reference pressure, for providing a second output signal proportional to the pressure to which said front side is exposed.

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