The ABB D674A859U05 is a sensor electronics unit designed for the FSM4000 series of thermal mass flowmeters. This component is integral to the flowmeter’s operation, providing the processing power to accurately measure the mass flow of gases in various industrial applications. The FSM4000 system is renowned for its robustness, high accuracy, and wide turndown ratio, making it ideal for challenging processes such as flare gas measurement, biogas monitoring, and compressed air systems. By utilizing the calorimetric measurement principle, it delivers direct mass flow readings without the need for additional pressure or temperature compensation, ensuring reliable and repeatable performance in demanding environments.