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An optimal alarm system design method, which takes full
advantage of the inherent hardware , temporal and spatial
redundancies in a mass energy-flow network, has been proposed in
this study. In particular, systematic procedures have been
developed to identify independent measurement methods for the
flow rate and temperature of any stream in the process and to
synthesize corresponding alarm generation logic. In order to
implement the suggested alarm strategy, the formulas for
evaluating conditional probabilities of type I and II mistakes
have also been derived. The results of applying the proposed
alarm system to the application example show that the approach
taken in this work is effective in suppressing the latter
mistakes. Further, this system is superior to any of the
existing alarm techniques in the sense that it can be
appropriately tailored to minimize the expected loss due to
misjudgments in generating alarms.
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