Homework 14 - Tuning

Homework 14 - Tuning - Proceed as follows(a Explain why the...

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Chemical Engineering Department University of Florida ECH 4323 Process Control Theory HOMEWORK No. 14 — TUNING 1.0 Exercise 12.11 Hint : In parts (a)-(d), assume the controller is a servo controller (not a regulator). Write down the servo transfer function in terms of K m , G c , G IP , G v , G p (or G), and G m . Answer the questions based on whether the servo transfer function changes. Hint 2 . In part (b), assume that the span remains unchanged 2.0 Exercise 12.16 Hint : The purpose of this problem is to identify which of the four instruments (FT1, FT2, LC, or LT) is failing.
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Unformatted text preview: Proceed as follows: (a) Explain why the measurements from FT1 and FT2 are inconsistent with observations (based on mass balance). (b) Argue that LT is functioning correctly. (c) Argue that LC is functioning correctly. (d) State why the Feed Flow must be higher than the Liquid Flow. (e) Argue that one of the FT's is reading an incorrect value (from part a). (f) Which instrument (FT1 or FT2) is the bad one? Note : Failure of orifice plates tends to produce readings that are higher than the actual flow rates....
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