LEVEL MEASUREMENT INSTRUMENT FIDUCIAL DIAGNOSTICS
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United States of America Patent
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Issued Date -
May 1, 2014
app pub date -
Oct 22, 2013
filing date -
Oct 31, 2012
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Abstract
A process measurement instrument including a fiducial and adapted for detection of the fiducial. The instrument comprises an interface circuit comprising a drive circuit for transmitting a pulse signal at the fiducial and at a target of interest and a receive circuit receiving reflected echoes of the pulse signal and developing an analog receive signal representative of the reflected echoes. A signal processing circuit is operatively coupled to the interface circuit for receiving the analog receive signal and determining characteristics of reflected echoes for the fiducial and the target of interest. The controller is operatively coupled to the signal processing circuit and includes a diagnostic routine responsive to the characteristics of the reflected echo for the fiducial in determining if a fiducial error condition exists.
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