Re: [foxboro] PH controller in Waste Water Treatment
- From: "Joseph M. Riccardi" <Joe@xxxxxxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Tue, 21 Mar 2006 22:52:03 -0500
Robert,
The PIDA or PIDX (with non-linear error control for the titration curve,
anticipatory cascade control, and flow feedforward) is probably capable of
solving your problems. If (and that's a big IF) the process design makes it
possible (pretreatment, mixing/agitation, holding tanks, linear acid/base
control, short process lag/deadtimes, etc.).
But good luck. You'll still need it ...
PS. Not to start a backlash, but "model-based" PC control software (i.e.,
ControlSoft, Inc.'s MANTRA?) can be a better solution. I assume it is safe
to mention because model-based control is not available with the Foxboro IA
System. It is the best solution for long process lag(I)/deadtimes(D). The
PID controller cannot successfully control any process with long
lag/deadtimes (i.e., wastewater plants). My intent is not to push another
vendor's product (I have no ties to ControlSoft, Inc.) in this forum, but if
the Foxboro IA System does not offer a real solution, why let a customer
continue to "struggle"?
Joseph M. Riccardi, Inc.
DCS Services - Industrial Process Control
North-Central Office (OH, PA, MI, IN, WV Area)
South-East Office (FL, GA, AL, SC, NC Area)
www.eRiccardi.com
"To give real service you must add something that cannot be bought or
measured with money; and that is sincerity and integrity." - Donald A. Adams
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Balmer, Robert D.
Sent: Tuesday, March 21, 2006 1:42 PM
To: Foxboro DCS Mail List
Subject: [foxboro] PH controller in Waste Water Treatment
Does anyone out here on the list have a good I/A controller solution for PH
control in dealing with waste water?
One of our local talents has come across a MFA PH controller and thinks it
is the answer to our problems. I just personally have never heard of this
type of controller.
We have struggled for years using stand alone controller on our effluent and
are looking for a good solution to stop the struggling.
Thanks in advance for any help.
Robert Balmer
Applications Analyst/Programmer
ISA CCST
Fort Madison Iowa
319 463 2206
rbalmer@xxxxxxxxxxxxxxx
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