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Extended measurement capability transmitter having shared overpressure protection means

  • US 5,022,270 A
  • Filed: 05/29/1990
  • Issued: 06/11/1991
  • Est. Priority Date: 06/15/1989
  • Status: Expired due to Term
First Claim
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1. A transmitter sensing at least one applied pressure and providing output representative of the applied pressure, comprising:

  • a pressure sensor having an output and at least one inlet and sensing pressures within a first pressure measurement range;

    a pressure sensor having an output and at least one inlet and sensing pressures within a first pressure measurement range;

    overpressure protection means for coupling the applied pressure to the pressure sensor inlet including means for containing a volume of substantially incompressible isolator fluid leading to the pressure inlet, the applied pressure causing a movable member to act on the isolator fluid as applied pressure changes, the overpressure protection means including a chamber which changes in volume as applied pressure changes to permit the movable member to contact a stop, limiting further increase in fluid pressure acting at the sensor inlet when the applied pressure exceeds a preselected limit;

    at least one additional pressure sensor sensing pressures within an additional pressure measurement range and having an additional sensor output and a pressure inlet open to the volume of isolator fluid so that the overpressure protection means is shared by both pressure sensors; and

    electronics means for combining the sensor outputs for conversion to the transmitter output.

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