pH is the most common liquid process analytical parameter. Its measurement and control are important across the process industries including pharmaceuticals and chemicals production. Typically, pH is measured using glass pH sensors, an instrument that has been available for almost 100 years. Over this time, many developments have been introduced to improve sensor measurement accuracy, durability and ease of use. Today, pH sensors for industrial use are high performance devices, tailored for specific applications.
METTLER TOLEDO (2015) Good Operating Procedures for pH Sensors.pdf