ANF388 thermal gas mass flow meter is designed based on the principle of heat diffusion. The instrument uses the constant temperature difference method to accurately measure the gas. It has the advantages of small size, high degree of digitization, easy installation, and accurate measurement. The mass flow meter is a relatively accurate, fast, reliable, efficient, stable, and flexible flow measurement instrument. It will be more widely used in the fields of petroleum processing and chemical industry. It is believed that it will show great potential in promoting flow measurement. The mass flow meter cannot control the flow. It can only detect the mass flow of the gas and output the flow value through analog voltage, current or serial communication.