Advanced pH Measurement and Control by Gregory K. McMillan

By Gregory K. McMillan

This best-selling publication offers a transparent, concise, and finished view of ways to pick, set up, and preserve electrodes, regulate valves, and keep an eye on options for pH functions severe for product and water caliber within the approach undefined. The e-book covers each point of procedure layout together with the blending and reagent piping standards which are vital for a profitable application.
The crucial innovations are summarized as key insights and the simplest practices are provided as ideas of thumb in the course of the publication. The rising strength of dynamic on-line pH estimators is explored to make current pH measurements quicker and extra trustworthy. the most recent advancements in complex batch keep watch over, adaptive keep an eye on, linear reagent call for keep watch over, and version predictive regulate 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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Some operators log the time of the laboratory result. The only way that a laboratory p H measurement result can be correlated with the actua l p rocess pH and temperature recorded in the d ata historian, is to have the sample correctly time stamped. a. sam/,'e 111t! sample and the curve slwuld be m,rrh',' willr the exact time the w as take" and the process temperature at the electrode. ~ ~ ~ The laboratory meter and the field transmitter mnst s se tire same algorithm fo r solution temperature compensation.

N = (2-10) 35 Copyrighted material 36 Chapter 2: The Chemistry c = n (2-1b) V where: c d M - n - V = x - molar concentration of diluted add or base (gm-moles per liter) density of solution (gm per liter) molecular weight of pure acid or base (gm per gm-mole) number of gm-moles of pure acid or base volume of solution (liters) weight fraction of pure acid or base in solution Molal units arc used predominately by engineers and scientists studying electrolytes because the concentration calculation is independent of density and, hence, temperature.

Agure 3·1d. For a Weak Acid and Week Base, the Control System sensitivity and p H Process G81n Is Moderated Even l or set Points Near the Equivalence Point Copyrighted material 60 Chapter 3: Titration Curves " 00 "00 " 00 . / '00 o. O~ , ~ R ~ II"",,," Figure 3-1e. MultIple S-shaped Curves are Formed l rom Multiple Week Acid and Seae Dissoc Iati on Constents II They Are Spread Apa rt by More Th an Two pH UnIts 3-2. Laboratory Generation Labo ratory titration curves arc typically done by placing a known volume of the process sample in a beaker and logging the pH indication for each incremental vol ume of reagent added via a burette.

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