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Spectral diagnostics in a magnetic flow meter

  • US 6,615,149 B1
  • Filed: 05/23/2000
  • Issued: 09/02/2003
  • Est. Priority Date: 12/10/1998
  • Status: Expired due to Term
First Claim
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1. A magnetic flow transmitter, comprising:

  • a driver adapted to provide a driver output at a selected fundamental to a coil on a flow tube carrying a flow of a liquid;

    an amplifier having an amplifier input adapted to couple to electrodes on the flow tube, the amplifier having an amplifier output;

    an analog-to-digital converter having a digital output related to the amplifier output; and

    a digital processor that receives the digital output and generates spectral components of the digital output that extend over both the fundamental and a frequency of a known potential noise source different than the fundamental;

    the processor providing a flow output as a function of at least one spectral component at or near the fundamental, the processor further providing a diagnostic output as a function of at least one spectral component at or near the frequency of the noise source.

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