As an Instrumentation Engineer, I explain this process based on a typical flow control loop. In this system, the goal is to control the fluid flow through the pipeline using a control valve (FV), based on continuous readings from a flow transmitter (FT). The FT (Flow Transmitter) measures the flow rate of the fluid passing through the line. It detects the differential pressure between two points (typically using a primary element like an orifice plate or venturi) and converts that measurement in