Abstract: in order to improve the measurement accuracy, reduce costs , and achieve intelligent funetionality for the magnetic rotor flowmeter, a digitally intelligent upgraded magnetie rotor flowmeter is designedwith the STC8H as the control core for hardware and soltware design. The magnetie switch sensor detectsthe float height and converts it into an electrical signal. The relationship between the sensor output and thelow rate is determined using the piecewise linear correction method, enabling the calculalion of flow rateand cumulative flow. By implementing data acquisition , remote communication with the host computer, andcireuits for display and control, the intelligenee and digitalization of the magnetic rotor flowmeter are a-chieved. A prototype is developed, and a test platform is set up. Measurement results demonstrate that theaccuracy of the measurements can be improved

Key words: magnetie rotor flowmeter, magnetic switch sensor, piecewise linear correction method