Abdul Aziz Ishak, Dept. of Chemical Engineering, Universiti Teknologi MARA, MALAYSIA
E-mail: aabi@kkps.fk.um.edu.my / Webpage: http://aabi.tripod.com
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TEST YOURSELF: Calculate the optimum PI for this process.
 

1. Data captured using a paperless recorder of a flow decreasing process

2. Data captured using a chart recorder of a flow decreasing process


 

Answers:

1. Td = 3.3 s, RR = 0.1747 / s, P = 64.1%, I = 11 s

2. Td = 1.8 s, RR = 0.3230 / s, P = 64.6%, I = 6 s

Your answers should not differ much from mine.

F.G. Shinskey: Process Control System of 4th Ed. p99
For liquid flow loop: P is between 50 - 500% and I is between 0.3 - 3 s

4 October 99 / updated: 20 August 2001