Get Advanced pH Measurement and Control PDF

By Gregory K. McMillan

ISBN-10: 1934394432

ISBN-13: 9781934394434

This best-selling e-book presents a transparent, concise, and complete view of ways to choose, set up, and keep electrodes, regulate valves, and keep an eye on suggestions for pH functions severe for product and water caliber within the procedure undefined. The ebook covers each point of procedure layout together with the blending and reagent piping requisites which are very important for a profitable application.
The crucial recommendations are summarized as key insights and the easiest practices are provided as principles of thumb through the ebook. The rising potential of dynamic on-line pH estimators is explored to make current pH measurements speedier and extra trustworthy. the most recent advancements in complex batch keep watch over, adaptive regulate, linear reagent call for regulate, and version predictive keep watch over are awarded to minimize reagent intake and variability.
Этот бестселлер обеспечивает четкое, краткое, и полное представление о том, как выбрать, установить и поддерживать электроды, регулирующие клапаны и стратегию борьбы с измерением рН, решающее значение для качества продукта и воды в обрабатывающей промышленности. Книга охватывает все аспекты проектирования систем, в том числе и требования смешивания реагентов трубопроводов, которые важны для успешного применения. Важнейшие концепции можно резюмировать ключевые идеями и лучшими практиками, представленных в виде эмпирических правил на протяжении всей книги. Возникающие возможности динамического измерения рН изучены, чтобы сделать существующие измерения рН более быстрыми и надежными. Последние события в расширенный контроля, адаптивного управления, линейное управление подачи реагента и модели интеллектуального управления представлены для уменьшения расхода реагентов и изменчивости.

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Extra info for Advanced pH Measurement and Control

Example text

If you also co ns ider that the sp lit range point for the reagent valves is the point of grea test valve ga in discontinuity and stickslip, sp lit ranged operation can significan tly increase the cos t o f reagents and crea te excess salts . To p revent wasteful cross neutralization, reset is turned off or reagent addition is sh u toff once the pH is w ith in an acceptable con trol band. If there is no consumption of reagent in a tradItional sequential batch operation, the pH response is integrating and the pH loop will continuously oscillate across the split range point.

The di ssociation constants hav e to be more than 2 pH units apart to create multiple S-sha ped curves. The curves are symmetrical because the concentrations and the distances between the Copyrighted material 59 Chapter 3: TItration Curves .. 00 /' . 00 •• ' 00 . ro> ... ,- Fig ure 3-1c. For a Strong Acid an d Weak Bah . the Control System sensItivity and pH Proces. Gain Is a Concarn lor 2 to 8 pH Set Polnlll dissociation constants are equal. Normally pH titration curves are not sym metrical. /1 '00 ..

F(1lJ Ch trKttrl _ .. lc Mlnr ... ~ - - .. - -- ~~I-I~:---------Ad,ptl", : ,, ". ', © 10 10 20 "" dl _ _ • Figure 1·58, Advanced Control Techniq ues to MInimi ze Reagent Usage Copyrighted material 28 Chapter 1: The Essentials 1-6. Life Is • Balch All processes have a beginning and an end . A contin uous process can be thought o f as a long batch that can benefit from the a utoma tion of its sta rtup and sh u tdow n by the use of sequencing techniques and stan dards d eveloped for batch operations.

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Advanced pH Measurement and Control by Gregory K. McMillan

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