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Advanced Regulatory Control by David W. Spitzer

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Design

Top-down design (see Figure 13-1) implies that the detailed specifications of a particular instrument (bottom level, containing details) cannot be implemented until the process control goals and control strategies (top level, containing more general ideas) are developed and finalized. Similarly, a number of intermediate steps, which may overlap somewhat between the top and bottom, should be performed, starting from the most general and constantly moving to the more specific.

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FIG. 13-1. Top-down design

Define the Product and Its Quality Examination of a process flow sheet or process and instrumentation diagrams (P&IDs) will usually result ...

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