What is the working principle of gas mass flow meter?

Principle Structure The temperature sensor measures the temperature of the gas in the pipeline, and the other is a speed sensor. The electric heating conductance is higher than the temperature measured by the temperature sensor, and the temperature difference is kept constant. When the gas flow takes away the heat on the speed sensor, in order to keep the temperature difference constant, additional electric compensation heating is required, and the electric power of this compensation is proportional to the gas mass flow. In the above formula: Qm is the gas mass flow rate, K is the instrument coefficient (constant), △p is the compensated electric power (can be obtained by measurement), Cp is the specific heat capacity at constant pressure (determined by the gas composition); △t is the two probes The temperature difference between (constant): S is the cross-sectional area of ​​the pipe. Based on the above principles, for the flow measurement of large pipe diameter, although the corresponding large diameter calibration device is used to calibrate the flowmeter, it is only necessary to measure the corresponding mass flow rate on the standard diameter calibration device, and it can be conveniently measured. The mass flow rate of the fluid in the large bore. Both sensors are made of metal platinum material with stable performance, sealed in 316L stainless steel tube or special material tube resistant to acid and alkali corrosion through special process, so they are extremely strong and will not pollute the measured fluid or be affected by the measured fluid. Fluid contamination, and its corrosion resistance is very good. Pay attention to the mass flowmeter, which uses heat-sensitive measurement. The flow is measured by the molecular mass taken away by the split molecules. Because it uses heat-sensitive measurement, the measurement result will not be affected by changes in gas temperature and pressure. . Mass flowmeter is a relatively accurate, fast, reliable, efficient, stable and flexible flow measuring instrument, which will be widely used in petroleum processing, chemical industry and other fields, and it is believed that it will show great potential in promoting flow measurement. The mass flowmeter cannot control the flow, it can only detect the mass flow of liquid or gas, and output the flow value through analog voltage, current or serial communication. However, the mass flow controller is an instrument that can detect and control at the same time. In addition to the measurement part, the mass flow controller itself has an electromagnetic regulating valve or a piezoelectric valve, so that the mass flow control itself constitutes a closed-loop system for controlling the mass flow of the fluid. The setting value of the mass flow controller can be provided by analog voltage, analog current, or computer, PLC.

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