The working principle of thermal mass flowmeter is mainly based on the law of heat transfer. The mass flow rate of the fluid is calculated by measuring the temperature change or energy consumption caused by the fluid flowing through the heating element. The following is a detailed description of the working principle of the flowmeter:

 

Overview of working principle

The thermal mass flowmeter uses the temperature field change generated when the fluid passes through the external heat source to heat the pipeline, or by heating the fluid and measuring the relationship between the energy required for its temperature rise and the mass of the fluid to indirectly measure the mass flow rate of the fluid. This flowmeter is particularly suitable for measuring the mass flow rate of gas because it has the characteristics of high accuracy, high repeatability and high reliability.

 

Specific working principle

Configuration of heating and temperature measuring elements:

Thermal mass flowmeters usually contain two main elements: one is a heater (or heat source) and the other is a temperature sensor. The heater is responsible for providing heat to the fluid to change its temperature; the temperature sensor is used to monitor the changes in the fluid temperature and convert these changes into electrical signals for processing.

 

Relationship between heat transfer and flow rate:

When the fluid flows through the heating element, it will take away some heat, causing the temperature of the heating element to drop. The faster the fluid flows, the more heat it takes away, and the more obvious the temperature drop of the heating element. There is a direct correspondence between this temperature change and the mass flow rate of the fluid.

 

Control mechanism and measurement:

In order to maintain accuracy during the measurement process, thermal mass flow meters usually include a control mechanism to adjust the power or temperature of the heater to maintain a constant temperature difference with the fluid. This control mechanism helps to eliminate the influence of environmental factors on the measurement results.

 

The temperature sensor monitors the changes in fluid temperature in real time and converts these changes into electrical signals for processing. The processed signal is calculated by the algorithm to obtain the mass flow value of the fluid.

 

Features and advantages

High precision: Since the mass flow rate of the fluid is measured directly, it is not affected by changes in physical properties such as fluid density, pressure and temperature, and has high measurement accuracy.

 

High reliability: There are no mechanical parts inside, which reduces failure points and maintenance costs and improves the reliability of the equipment.

 

Wide applicability: It can be used to measure the flow of various types of gases, including corrosive, flammable and explosive special gases.

 

Low pressure loss: Reasonable design, less pressure loss caused to fluid flow.

Application fields

 

Thermal mass flow meters are widely used in areas that require high-precision flow measurement, such as gas flow measurement in steel plants and coking plants; air flow measurement in boilers; and air flow monitoring in automobile engines. In these applications, thermal mass flow meters can provide accurate and reliable flow data to help users better control production processes and improve product quality.

 

If you want to know more about thermal mass flow meter, please consult CIXIFM winny:

Email: sales01@cxflowmeter.com

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