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Multivariable transmitter

  • US 5,495,769 A
  • Filed: 05/22/1995
  • Issued: 03/05/1996
  • Est. Priority Date: 09/07/1993
  • Status: Expired due to Term
First Claim
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1. A two wire transmitter transmitting mass flow of a fluid, comprising:

  • a first pressure sensor for sensing a differential pressure of the fluid;

    a second pressure sensor for sensing a line pressure of the fluid;

    an input for receiving a temperature variable representative of process grade temperature;

    a compensation microprocessor receiving the temperature variable and signals from the first and second pressure sensors and providing a compensated differential pressure output and a compensated line pressure output;

    a mass flow microprocessor receiving the compensated differential pressure output and the compensated line pressure signal output and providing an output representative of mass flow; and

    a communications microprocessor receiving the mass flow output for formatting the mass flow output and coupling to a two wire circuit which powers the transmitter.

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