Most people hardly notice that I twitch at the mention of hydrogen ion concentration.
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. Case histories of representative installations show that success in implementing these pH controllers depend not only on assessing the complexity of the loop and selecting a control strategy but also on recognizing and avoiding pitfalls while specifying and installing instrumentation, equipment, and piping. Systems pH control systems are characterized by extreme rangeability and sensitivity, and are also subject to difficulties arising from contact between measuring electrodes and hostile fluids.
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