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Extended measurement capability transmitter having shared overpressure protection means

  • US 4,949,581 A
  • Filed: 06/15/1904
  • Issued: 08/21/1990
  • Est. Priority Date: 06/15/1989
  • Status: Expired due to Term
First Claim
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1. A transmitter for sensing a difference between two applied pressures, comprising:

  • a differential pressure sensor having a pair of pressure inlets;

    overpressure protection means for isolatingly coupling the pair of applied pressures to a corresponding pair of separated volumes of substantially incompressible isolator fluid and correspondingly to the pair of pressure inlets, the overpressure protection means limiting further increase in isolator fluid pressure when the applied differential pressure exceeds a preselected limit and;

    at least one additional differential pressure sensor each having a pair of pressure inlets, each inlet open to one of the two volumes of isolator fluid so that the overpressure protection means is shared by such pressure sensor, such pressure sensor extending the measurement capability of the transmitter.

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