The mass flowmeter uses a thermal measurement method to measure flow rate by determining the amount of molecular weight carried away by the separated molecules. Since it uses a thermal measurement method, changes in gas temperature and pressure will not affect the measurement results. Quality flowmeter is a relatively accurate, fast, reliable, efficient, stable, and flexible flow measurement instrument, which will be widely used in fields such as petroleum processing and chemical industry. It is believed that it will show great potential in promoting flow measurement. Mass flow meters cannot control flow rates. They can only detect the mass flow rate of liquids or gases and output flow values through analog voltage, current, or serial communication.