Data processing: measuring – calibrating – or testing – Measurement system – Performance or efficiency evaluation
Reexamination Certificate
2005-06-07
2005-06-07
Wachsman, Hal (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system
Performance or efficiency evaluation
C702S050000, C702S047000, C340S608000, C073S061730
Reexamination Certificate
active
06904386
ABSTRACT:
A method and control system is disclosed that monitors the high frequency or commonly referred to as the “noise” component of a measurement signal to detect plugging conditions in fluid flow systems monitored by DP-cell based sensors. This high frequency component has contributions from the process factors like disturbances, user actions and random effects like turbulence. A test statistic θ(t) has been developed that monitors the proportion of variance introduced by process factors and random effects. By monitoring this proportion, it is possible to detect a frozen sensor that is characterized by a dramatic reduction in the variance due to process factors over a sufficiently long detection window. The method works with measurements sampled at frequencies commonly achievable in a process environment.
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Honeywell International , Inc.
Ohlandt Greeley Ruggiero & Perle L.L.P.
Wachsman Hal
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