Factors Affecting Measurement Accuracy of Mass Flow Meter

Factors affecting the measurement accuracy of the mass flowmeter The mass flowmeter directly measures the mass flow of the medium passing through the flowmeter, and can also measure the density of the medium and indirectly measure the temperature of the medium. 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. The mass flowmeter is flexible in configuration, powerful in function, and high in performance and price ratio. It is a new generation of flowmeter. The mass flowmeter is based on the Coriolis force. There are two parallel flow tubes inside the sensor. The drive coil is installed in the middle and the detection coil is installed at both ends. When the excitation voltage provided by the transmitter is applied to the drive coil, the vibrating tube For reciprocating periodic vibration. Mass flowmeter is a relatively accurate, fast, reliable, efficient, stable and flexible flow measuring instrument, which is widely used in petroleum processing, chemical industry and other fields. The most notable feature of the mass flowmeter is that it can directly measure the mass flow of the medium without being affected by factors such as the pressure and temperature of the working state of the medium. Factors affecting the measurement accuracy of mass flowmeters: 1. Environmental vibration The mass flowmeter can work in a vibrating environment, but it must be isolated from vibration, such as connecting with the vibrating tube with a flexible tube and using a vibration-isolated support frame. However, it should be prevented that the vibration frequency is the same as the working frequency or harmonic frequency of the mass flowmeter. Multiple meters of the same model are installed in series or relatively close to parallel, especially on the same support platform, the operating frequency vibration of each mass flow meter will affect each other, causing abnormal vibration, and in severe cases, the meter will not work. When ordering, it can be specially proposed to the manufacturer to stagger the working frequency of the two mass flowmeters in series. 2. Effect of fluid density Changes in fluid density change the quality of the flow measurement system, thereby changing the balance of the mass flowmeter sensor, resulting in zero point offset. If a specific liquid is measured, as long as it is zeroed under the condition of the actual liquid density, the density will not change much during use, and generally there is no problem. However, when measuring several liquids with large density differences on a pipe, it will bring additional errors of zero point changes. 3. Influence of fluid viscosity The mass flowmeter can measure the liquid viscosity in a wide range and exhibit good measurement performance. Although there are reports that viscosity affects measurement, there are few experimental data. Fluid viscosity changes the damping characteristics of the system, thereby affecting zero bias; at low flow rates, it has an effect on mass flow meter flow measurements to a certain extent.

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