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Diagnostic device for use in process control system

  • US 20080103629A1
  • Filed: 12/20/2007
  • Published: 05/01/2008
  • Est. Priority Date: 06/21/2005
  • Status: Active Grant
First Claim
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1. A diagnostic device for detecting a failure of a sensing means, which sensing means comprises at least one of first and a second impulse lines, wherein the diagnostic device comprises a recording means for repeatedly recording pairs of two absolute pressure values, the absolute pressure values being related to absolute pressures in the first and the second impulse lines, respectively, a computation means for repeatedly computing, from a prescribable number of pairs of the two absolute pressure values, a correlation value representative of the correlation between the two absolute pressure values, a comparison means for comparing correlation values to at least one correlation threshold value, and an output means for outputting a diagnostic output depending on the result of the comparison, wherein the correlation values are compared to a lower correlation threshold value and to an upper correlation threshold value.

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