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Two-wire transmitter with threshold detection circuit

  • US 4,804,958 A
  • Filed: 10/09/1987
  • Issued: 02/14/1989
  • Est. Priority Date: 10/09/1987
  • Status: Expired due to Term
First Claim
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1. A two-wire current transmitter for providing a transmitter output which is representative of a parameter to be sensed, comprising:

  • sensing means, having a sensor responsive to the parameter and an excitation means coupled to the sensor for providing an excitation output for exciting the sensor, for providing a sensor output which varies as a function of the excitation output and the parameter to be sensed;

    output means coupled to the sensor output for providing the transmitter output as a function of the sensor output to the two-wire circuit; and

    threshold detection means coupled to the sensor output, having at least one predetermined threshold value, for providing a detector output to the output means as a function of the sensor output and the threshold value, such that the transmitter output is further representative of an undesired change in the excitation output.

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