Advanced pH Measurement and Control by Gregory K. McMillan

By Gregory K. McMillan

This best-selling booklet offers a transparent, concise, and entire view of the way to choose, set up, and retain electrodes, regulate valves, and keep watch over options for pH functions serious for product and water caliber within the procedure undefined. The e-book covers each point of process layout together with the blending and reagent piping necessities which are very important for a profitable application.
The crucial ideas are summarized as key insights and the simplest practices are provided as ideas of thumb during the publication. The rising power of dynamic on-line pH estimators is explored to make current pH measurements speedier and extra trustworthy. the newest advancements in complex batch regulate, adaptive keep an eye on, linear reagent call for keep watch over, and version predictive keep an eye on are provided 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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Example text

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. Samples should be kept in Pyrex glass o r polyethylene plastic bottles. Soft glass bottles should not be used because the glass solubility is great eno ugh to raise the pH due to the absorption of a lkali ions by the sa mple.

Mos t effl uen t streams in waste treatment are d ilute enough that the activity coefficient for hyd rogen can be considered equal to one. However this is not true for many reagen t and some influent streams or for reactions where salts are formed. For highly concentrated strea ms, the pH becomes effectively a fu nct ion of water content. In o ther words as the salt concentration goes up and the water conce ntra tion goes d own, the pH w ill increase even though the concentration of acids or bases has not changed .

Automa tic end-point pred iction and shutoff based on rate of change of pH 4. Pulse wi d th and amplitu de modulation of a proportional-only controller output 5. Cascade of batch pH to inline pH control of a high recircul ation flow Induslriallmportance In the food and beverage, chemica l. petrochemica l, pharmaceutical, power, p ulp and paper, and textile industry, pH measuremen t and control is im portant for process efficie ncy and prod uct quality, besides protection of th e enviro nment. Table 1-7a summarizes th e importance of pH fo r various ind ustria l applications.

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