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Software, Automation & Control :: Instrumentation, Automation & Control :: Analyzers, Gages & Indicators

August 1, 2010

pH Measurement And Control

When measured correctly, pH can be an invaluable tool for both product and process control

Greg McMillan and Rich Baril, Emerson Process Management

The mechanical design and material science of pH-sensor technology have evolved dramatically over the last century. Current-day uses include a wide range of applications from high-purity pharmaceutical processing to wastewater treatment. Some of these applications pose high challenges to pH measurement, including high-temperature and otherwise harsh measuring environments, stability (particularly in pharmaceutical processes), low conductivity measurement and more-stringent pH control in processes. This article outlines the basics of pH measurement and control, with focus on some of these applications, and explores recent advances — such as the development of embedded memory chips and transmitters with smarter diagnostics and wireless communication — that have been developed to offer predictive maintenance, portability and greater stability....

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Comments (1) for pH Measurement And Control
1.
On the issue of ph CONTROL, I have found that the simple practice of additing flow bias, in the form of feedforward, to the pH controller, greatly reduces the envelope, by minimizing the dead time.
In addition, regarding the use of control valves, particularly when milk of lime is being used to correct pH, a splitter box with a specially shaped nozzle, gives particularly good results. Both these techniques are used extensively in the Sugar Industry.
Posted by Charles Palmer on Friday, August 27, 2010 @ 07:21 AM

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