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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