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『Structure and principle of mass flowmeter』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
1. Working principle of indirect mass flowmeter
The indirect mass flowmeter works based on the principle of Coriolis force, and directly obtains the mass flow rate by measuring the phase difference or frequency change of the chain sock generated by the fluid in the vibrating tube. The core principle of an indirect mass flowmeter (Coriolis mass flowmeter) is to allow fluid to flow through one or a group of vibrating measuring tubes. When there is no fluid flow, the measuring tube vibrates up and down but maintains symmetry; When there is fluid flow, the Coriolis combustion effect will cause the measuring tube to twist, resulting in a phase difference between the vibration on the inlet and outlet sides. The sensor detects this phase difference, which is proportional to the mass flow rate of the fluid, and the converter calculates the accurate mass flow rate value based on it. 2. Key components of the sensor unit include a vibrating tube (U-shaped, Ω - shaped, straight tube type, etc.), a driving coil (maintaining continuous vibration of the pipeline), and a detection coil (picking up vibration signals from the inlet and outlet sides). Converter (transmitter): receives sensor signals, processes and calculates them, and finally displays data such as mass flow rate, density, temperature, etc., and outputs standard signals
3. Main technical features: directly measures mass flow rate: does not require pressure and temperature compensation like the excitation of a volumetric flowmeter. High precision: It can generally achieve an accuracy of ± 0.1% to ± 0.2%. Multi parameter measurement: can simultaneously measure fluid density and temperature. Wide applicability: It can measure various Newtonian fluids such as l
2. Structure and principle of mass flowmeter
The volume of fluid is a function of fluid temperature and pressure, and is a dependent variable, while the mass of fluid is a quantity that does not change with time, spatial temperature, and pressure.
. As mentioned earlier, commonly used flow meters such as orifice flow meters, laminar mass flow meters, turbine flow meters, vortex street flow meters, electromagnetic flow meters, rotor flow meters, ultrasonic flow meters, and elliptical gear flow meters measure the volumetric flow rate of the fluid. The amount of waste involved in scientific research, production process control, quality management, economic accounting, and trade handover activities is generally related to quality. The use of the above-mentioned flowmeter to measure only the volumetric flow rate of the fluid often cannot meet peoples requirements, and it is usually necessary to find ways to obtain the mass flow rate of the fluid. Previously, the mass of a fluid could only be indirectly obtained through methods such as correction, conversion, and compensation after measuring parameters such as temperature, pressure, density, and volume. This measurement method involves multiple intermediate steps, making it difficult to ensure and improve the ac