By Thomas Roemer, KROHNE
One of the most commonly used measurements in the water and wastewater industry is pH. A measurement of how acid or alkaline a substance is, a pH reading can instantaneously indicate a problem with the water. Another common and useful measurement is oxidation-reduction potential (ORP). Treatment facilities use ORP sensors to optimize disinfection and biological nutrient removal processes.
These instruments are typically installed at various locations throughout the treatment process, with measured values sent to some type of data logging or supervisory control and data acquisition (SCADA) system. Ensuring accurate readings from these instruments is critical for process control and regulatory compliance. For simplicity, we’ll discuss pH meter calibration.