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Process Control Case Histories by Gregory K. McMillan

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pH Control: A Magical Mystery Tour

I do not pretend to be the world’s champion pH problem solver. But, I have helped rescue over 50 foundering pH control systems in the past 5 years and am still rational enough to tell you about it. Most people hardly notice that I twitch at the mention of hydrogen ion concentration.

WHY IT’S A PROBLEM

Why is pH control a problem? After all, you’ve got an odd but simple scale of measurement from 0 to 14 dimensionless units, measuring electrodes that have been around long enough to be well understood and readily applied, and instrument vendors who must have seen every possible application by now.

Rangeability and sensitivity

One basic source of difficulty is that—as countless articles, technical papers, and textbooks ...

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