The Rosemount Analytical Model 320B pH Sensor measures the pH of a flowing aqueous fluid. Typical applications include pH monitoring or control in boiler feed water, process water, chemical processes, municipal water treatment, and many other applications. The Model 330B measures oxidation reduction potential (ORP), and has applications in chromate waste treatment, bleaching operations, chemical processes and municipal water treatment. Depending on the application, the sensor may be installed directly in the process line or in a by-pass line.