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Industrial process variable transmitter with isolated power scavenging intrinsically safe pulse output circuitry

  • US 9,228,869 B2
  • Filed: 09/26/2013
  • Issued: 01/05/2016
  • Est. Priority Date: 09/26/2013
  • Status: Active Grant
First Claim
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1. An industrial process variable transmitter, comprising:

  • a process variable sensor configured to sense a process variable;

    measurement circuitry coupled to the process variable sensor configured to provide a measured output as a function of the process variable;

    output circuitry, comprising;

    a loop connection configured to couple to a process control loop;

    an optical sensor configured to receive the measured output from the measurement circuitry;

    a second optical sensor configured to receive the measured output from the measurement circuitry;

    a switching device configured to apply pulses to the process control loop in response to an output from the optical sensor;

    power supply circuitry configured to power the optical sensor with power received from a power source through the process control loop and loop connection; and

    wherein the optical sensor and the second optical sensor are configured to operate in a push/pull configuration.

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