Abdul Aziz Ishak, Dept. of Industrial Chemistry, Institut Teknologi MARA, MALAYSIA
Tel: 6-03-556-4881 / Fax: 6-03-559-7681 / E-mail: pidtuning@altavista.net / Webpage: https://members.tripod.com/aabi

TEST YOURSELF: Calculate the optimum PI for this process.
 

1. Data captured using a paperless recorder

2. Data captured using a chart recorder


 

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