The core principle of a thermal gas mass flowmeter is the thermal diffusion effect. It is mainly composed of two temperature sensitive elements, usually one is a heating element and the other is a temperature measuring element. During operation, the heating element is continuously heated to a set value higher than the gas ambient temperature. When gas flows in a pipeline, it takes away the heat emitted by the heating element. Different gas flow rates result in varying amounts of heat carried away. The temperature measuring element senses this temperature change in real time and converts it into an electrical signal output. According to the principle of thermal equilibrium and thermal diffusion equation, the mass flow rate of gas can be accurately obtained by accurately calculating the temperature difference and heating power parameters between the heating element and the temperature measuring element.

This flowmeter has many significant advantages. Firstly, its measurement accuracy is high. Due to the direct measurement of gas mass flow rate, it is not affected by changes in gas temperature, pressure, density and other parameters, and can provide stable and accurate measurement results. It also performs well in the field of small flow measurement, meeting the requirements of many industrial scenarios with strict flow control requirements, such as semiconductor manufacturing, pharmaceutical production, etc. Secondly, it has excellent real-time performance. Being able to quickly respond to changes in gas flow rate, timely output accurate flow data, provide strong support for dynamic adjustments in the production process, and help improve production efficiency and product quality. In addition, the gas mass flowmeter has a relatively simple structure and no movable parts, which makes it highly reliable and stable, with low maintenance costs and a long service life.

In practical applications, thermal gas mass flow meters are widely used in multiple fields. In the energy industry, flow measurement can be used for natural gas pipeline transportation to accurately grasp the transmission volume of natural gas, ensuring the rational allocation of energy supply and fair and just trade settlement. In the field of environmental protection, it is possible to monitor the flow of industrial waste gas emissions, providing data basis for environmental governance and pollution control. In chemical production, gas quality flow meters are particularly important for controlling the flow rate of various process gases, ensuring that chemical reactions occur under optimal conditions and improving production safety and economic benefits.

With the continuous advancement of technology, thermal gas mass flow meters are also constantly developing and improving. In the future, it will develop towards higher precision, wider range, and more intelligence, further enhancing its application value in various industries and injecting strong impetus into the development of industrial automation and intelligence.