AWT420 Universal 4-Wire Dual-Input Transmitter Operating Instruction

This document provides comprehensive operation, configuration, calibration, and maintenance procedures for the ABB AWT420 universal 4-wire, dual-input transmitter, which supports both traditional analog and advanced digital EZLink sensors for measuring parameters such as pH, ORP, conductivity, turbidity, dissolved oxygen, chlorine, and UIM. It includes detailed sections on safety, cyber security, sensor setup, calibration procedures, troubleshooting, data logging, Bluetooth connectivity, and PID control, along with appendices for spares and mounting kits.