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Isolation circuitry for transmitter electronics in process control system

  • US 5,610,552 A
  • Filed: 07/28/1995
  • Issued: 03/11/1997
  • Est. Priority Date: 07/28/1995
  • Status: Expired due to Term
First Claim
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1. A transmitter for sensing and transmitting a process variable, comprising:

  • electronic circuitry comprising;

    process variable input circuitry for receiving an input related to the process variable; and

    output circuitry transmitting the process variable;

    a reference level generator generating a reference level;

    a sensor having a sensor output related to the sensed process variable;

    isolation circuitry coupling the sensor to the electronic circuitry comprising;

    a first high impedance buffer connected to the reference level providing a buffered reference; and

    a first high impedance isolator coupling the buffered reference to an input of the sensor.

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