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1. Structure and Principle of Mass Flow Meter After parameters such as density and volume
The structure and principle of a mass flow meter are as follows: Structure: The structure of a mass flow meter mainly consists of a measuring part and a control part (for mass flow controllers). The measurement part usually adopts the principle of thermal sensing measurement, which measures the flow rate by sensing the heat carried away by fluid molecules. The control part (such as the mass flow controller) includes an electromagnetic regulating valve or piezoelectric valve to achieve closed-loop control of flow. Principle: Thermal measurement principle: The mass flow meter measures the flow rate by utilizing the heat carried away by the fluid flowing through the heating element. The temperature change of the heating element is directly proportional to the mass flow rate of the fluid, so the mass flow rate of the fluid can be calculated by measuring the temperature change of the heating element. Not affected by temperature and pressure: Since mass flow meters measure the mass of a fluid, not its volume, their measurement results are not affected by fluid temperature and pressure. This enables mass flow meters to maintain high measurement accuracy even under complex operating conditions. Output method: The mass flowmeter outputs the flow value through analog voltage, current, or serial communication, which is convenient for use with various display, recording, and control instruments. Application scope: Mass flow meters are widely used in fields such as petroleum processing and chemical engineering. Their accurate, fast, reliable, efficient, stable, and flexible measurement characteristics make them have great potential in
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2. Basic principles of mass flowmeter
The core principle of mass flowmeter is to calculate the mass flow rate by directly measuring the changes in the physical properties of the fluid. The mainstream Coriolis and thermal flowmeters are designed based on mechanical and thermal principles, respectively.
. 1. Basic principle of Coriolis mass flowmeter: Utilizing the Coriolis force effect generated during fluid flow. When fluid flows through a vibrating measuring tube, a force perpendicular to the flow direction is generated due to inertia, causing the measuring tube to twist and deform. Working process: The driver causes the measuring tube to vibrate at a fixed frequency. -When fluid flows through a vibrating tube, there is a phase difference between the inlet and outlet. -The sensor detects the phase difference and directly converts it into a mass flow rate value through a mathematical model. The measurement is not affected by temperature and pressure. 2. Principle basis of thermal mass flowmeter: Based on the law that the degree of heat carried away by fluid flow is proportional to the mass flow rate, it is divided into two control modes: constant temperature difference and constant power. Working process: In constant temperature difference mode, the power of the heating element increases with the flow rate, and the change in electrical power that maintains a constant temperature
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