Yokogawa Electric Corporation SR20-AP24 pH Electrode

The SR20-AP24 (SR20AP24) pH Reference Electrode from Yokogawa provides a stable reference potential for industrial pH measurements, designed as a non-flow reference with a rugged glass-body construction. It uses a silver/silver chloride (Ag/AgCl) reference with a thickened 3.3 mol KCl electrolyte and a PTFE diaphragm junction to resist fouling and contamination in continuous process environments. Designed for use with a glass pH electrode and temperature sensor, it supports a pH range of 0–14, a temperature range of 0 to 80 °C, and a pressure rating up to ~1000 kPa (~145 psi), making it suitable for water and wastewater treatment, chemical processing, and general industrial applications where stable, non-flow measurements are required. Common replacements include Yokogawa SR20-AC32, SR20-A32, and the SC21 combined pH electrode.