Difference between revisions of "PH Loop"
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[http://ragnarok.up.ac.za/Rigs/02_pH/2007/pH_Control_CWSteyn.pdf Report] | [http://ragnarok.up.ac.za/Rigs/02_pH/2007/ Project files] | [http://ragnarok.up.ac.za/Rigs/02_pH/2007/pH_Control_CWSteyn.pdf Report] | [http://ragnarok.up.ac.za/Rigs/02_pH/2007/ Project files] | ||
=== 2009 (Current) === | === 2009 (Current) === | ||
| − | A.H. Campher, | + | A.H. Campher, '''Maintenance, Modelling and Control of the pH-control Rig'''<br/> |
| − | [Report] | [Project files] | + | [http://ragnarok.up.ac.za/Rigs/02_pH/2009/CML732_Report_AH_Campher_2009.pdf Report] | [http://ragnarok.up.ac.za/Rigs/02_pH/2009/ Project files] |
== Documentation == | == Documentation == | ||
Large scale renaming of instruments, valves and tanks is being done. This renders all previous rig diagrams obsolete. Only 2009-updated diagrams should henceforth be used. | Large scale renaming of instruments, valves and tanks is being done. This renders all previous rig diagrams obsolete. Only 2009-updated diagrams should henceforth be used. | ||
| − | |||
=== Piping & Instrumentation diagrams === | === Piping & Instrumentation diagrams === | ||
| + | [http://ragnarok.up.ac.za/Rigs/02_pH/02pH_P&ID_2009.vsd .VSD (Visio)] | [http://ragnarok.up.ac.za/Rigs/02_pH/02pH_P&ID_2009.pdf .PDF] | ||
=== Wiring diagrams === | === Wiring diagrams === | ||
| + | [http://ragnarok.up.ac.za/Rigs/02_pH/02pH_WiringDiagram_2009.vsd .VSD (Visio)] | [http://ragnarok.up.ac.za/Rigs/02_pH/02pH_WiringDiagram_2009.pdf .PDF] | ||
== Rig maintenance == | == Rig maintenance == | ||
The maintenance of the pH rig is documented [[PH Rig Maintenance|here]]. | The maintenance of the pH rig is documented [[PH Rig Maintenance|here]]. | ||
Revision as of 13:35, 16 November 2009
PH control is a difficult problem due to the highly non-linear nature of the system. The steep slope of the titration curve around the pH = 7 point amplifies pH variations for even small base/acid addition variations. The pH control rig in the PMC lab illustrates that pH control is by no means impossible (albeit on a laboratory scale).
Contents
Current/Previous projects
1999
F.J. Botha, Ondersoek van die Dinamiese Gedrag van Sisteme waar pH Gemeet en Beheer word {Investigation of the Dynamic Behaviour of Systems where pH is Measured and Controlled}
[Hard copy of report available in pH rig folder]
2003
T. Leeuw & G. Mascini, pH Rig 2003 - CPL780 Process Control Laboratory
Report | Project files
2005
A.J. Swanepoel & M. Swanepoel (Botha), Model Based Control Laboratory, pH Control
Report | Project files
2007
C. Steyn, Fuzzy Logic Rule-Based Controller Design, Neutralization of Strong Acid with Strong Base
Report | Project files
2009 (Current)
A.H. Campher, Maintenance, Modelling and Control of the pH-control Rig
Report | Project files
Documentation
Large scale renaming of instruments, valves and tanks is being done. This renders all previous rig diagrams obsolete. Only 2009-updated diagrams should henceforth be used.
Piping & Instrumentation diagrams
Wiring diagrams
Rig maintenance
The maintenance of the pH rig is documented here.
