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[Chemical Knowledge]:The working principle of thermal flowmeter-high measurement accuracy and wide range of use

The thermal flowmeter is a flow measurement device based on a thermal sensor. It transfers the heat of the thermal medium flowing in the fluid to the thermocouple to make the temperature change, thereby realizing the measurement of the flow of the fluid in the pipeline. The working principle of

thermal flowmeter is based on the principle of material heat conduction, that is, when heat is conducted between two objects with different temperatures, the heat conduction rate is proportional to the temperature difference between the objects. In the thermal flow meter, the thermocouple is placed in the pipe, and when working, it is heated to a certain temperature, thereby generating a certain amount of heat energy. When the fluid passes through the pipe, the heat energy will be taken away, causing the temperature of the thermocouple to decrease. According to the thermal conductivity formula depending on the fluid velocity and temperature, the flow rate of the fluid can be obtained by calculating the temperature reduction rate of the thermocouple. The advantages of

thermal flowmeter are high measurement accuracy and wide range of use. It can measure extremely low flow rates, as well as high viscosity, high pressure, corrosive and high temperature fluids. At the same time, it will not be affected by the density, pressure and temperature of the fluid. In addition, the thermal flowmeter can also realize online monitoring and recording data through digital technology, which is convenient for later statistical analysis.

Of course, thermal flow meters also have their drawbacks. For example, it requires high heat transfer characteristics of the fluid, and the measurement accuracy may be affected by the properties of the fluid. In addition, when measuring high-temperature fluids, components such as cables and thermocouples may be affected by heat loss and thermal expansion, requiring various compensations and corrections.

thermal flowmeter is a very practical flow measurement instrument. Its working principle is simple, but it can realize high-precision flow measurement. With the continuous development of digital technology, thermal flowmeter will be more and more widely used in various fields, providing more reliable and accurate solutions for flow measurement.

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