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joozmax6
Active Contributor

Join Date: May 2008
Posts: 13

pH Controller

04/29/2009 4:04 AM

I'm planning to set-up an automated water acidification system. The desired pH range is 5 -6. The raw water pH is 7.8. Is it possible to automate the in-line acid feeding to adjust the pH? I will be using GF signet pH controller w/ sensor after the static mixer with injection quill where sufuric acid will be injected and mixed w/ the stream. I would like to control the acid feeding within the specified range.
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#1

Re: pH Controller

04/29/2009 4:09 AM

Some means of modulating either the acidity of the injectant or its flowrate will be needed. The modulation signal is an output from 3-term PID control - does the GF Signet unit have this functionality? If not then a separate 3-term controller will be needed.

Why does the pH need to be adjusted to 5-6?

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joozmax6
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Join Date: May 2008
Posts: 13
#2
In reply to #1

Re: pH Controller

04/29/2009 4:25 AM

I would like to convert the alkalinity to carbon dioxide and remove it by degassification. pH lower than 5 would mean insufficient alkalinity conversion while pH higher than six would cause high sulfates concentration in the product water which is undesirable. the gf signet pH controller only has 4-20 mA output and my metering pump has 4-20mA input.
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PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#3
In reply to #2

Re: pH Controller

04/29/2009 4:36 AM

OK, then a 3-term controller would be needed in addition to the kit described. How about Eurotherm <usual disclaimer>?

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naveen_menon
Commentator
India - Member - Naveen Menon Engineering Fields - Instrumentation Engineering - Naveen Menon

Join Date: Oct 2007
Location: India
Posts: 92
Good Answers: 2
#4

Re: pH Controller

04/29/2009 4:51 AM

how about something like a lake wood controller kit for this application
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find2am
Commentator
India - Member - ADIL MOULA Engineering Fields - Instrumentation Engineering - Adil Moula

Join Date: Jun 2008
Location: India
Posts: 95
Good Answers: 1
#5

Re: pH Controller

04/29/2009 4:10 PM

hi joozmax6 you require a PID controller you can select SIPART DR controller as per your requirement , http://pia.khe.siemens.com/index-process_instrumentation-process_controllers-2140.htm
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