Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Randy Longsdorf0
Dale Perry0
Garrie Huisenga0
Mark Schumacher0
Date of Patent
December 16, 2008
Patent Application Number
10866930
Date Filed
June 14, 2004
Patent Primary Examiner
Patent abstract
A Safety Instrumented System for use with a process control system receives pressure of process fluid in the process piping. A valve positioner positions a valve which controls flow of process fluid through the process piping. The valve positioner is caused to perform a partial stroke of the valve or otherwise introduce a perturbation into the process. A resulting change in sensed pressure due to the perturbation is used to diagnose operation of the process.
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