Yokogawa SC21-AAP26 Combined pH Sensor for Industrial Process Control

The Yokogawa SC21-AAP26 Combined pH Sensor is a 12 mm industrial electrode designed for continuous pH measurement in process streams, integrating the glass measuring electrode, Ag/AgCl reference, and temperature capability into a single sensor body. Its gel-filled electrolyte and PTFE junction deliver high fouling resistance and stable readings in harsh environments. Operating range covers pH 0–14, temperatures from 0 to ~110 °C, and pressures up to ~500 kPa, with a glass resistance of ~250–400 MΩ at 25°C. The sensor features a PG13.5 connection and is commonly deployed in wastewater treatment, chemical processing, power generation, and food & beverage systems, suitable for general-purpose and moderately harsh applications where fouling resistance and long-term stability are required.