The Three-Arm Full-Bore Flow Meter Mechanical Body (CRFM19) adopts a non-collecting, foldable turbine continuous rotation method. When the fluid passes through the turbine, it drives the turbine to rotate. The rotation speed is proportional to the flow rate of the fluid. The turbine’s rotation is then magnetically coupled to a magnetic-sensitive element inside the instrument, and the pulse signal related to the rotation speed is processed through electronic circuitry to obtain information about the fluid's velocity. The advantage of the full-bore flow meter is its good linearity, independence from fluid properties, and reliable measurement results.