Yokogawa EXA400 Printed Circuit Board Assembly

The Yokogawa EXA400 Printed Circuit Board Assembly is an internal electronics board for the EXA400 conductivity monitor transmitter, handling signal processing, measurement conversion, and output generation within the analyzer. Used as a service or repair component, this PCB restores failed EXA400 units rather than replacing the entire transmitter, offering a cost‑effective maintenance option; listings indicate it is commonly available as new old stock (NOS) or surplus replacement parts. Compatible specifically with Yokogawa EXA400 conductivity monitor transmitters, the PCB is installed as an internal replacement within the analyzer housing for conductivity measurement systems in water treatment plants, chemical processing facilities, and other industrial utilities where precise conductivity control is essential.