Coriolis mass flow meter characteristics and daily use

Abstract: Coriolis mass flow meter characteristics and daily use information are provided by excellent flow meter and flow meter manufacturers and quotation manufacturers. my country's trade measurement is settled by quality. Tianchen Borui's mass flowmeter can directly measure the quality of the fluid, which has a great advantage in foreign trade. Especially for oil measurement work, it is necessary to master the performance of the mass flowmeter. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the characteristics of Coriolis mass flowmeters and the details of daily use articles. my country's trade measurement is settled by quality. Tianchen Borui's mass flowmeter can directly measure the quality of the fluid, which has a great advantage in foreign trade. Especially for oil measurement work, it is necessary to master the performance of the mass flowmeter and the method of daily use, in order to maximize the role of the mass flowmeter in the process of future use. 1. Working principle of Coriolis mass flowmeter The measuring part of Coriolis mass flowmeter is mainly composed of elastic measuring tube, excitation unit, vibration pickup unit, closed-loop self-excited amplification unit, etc. The working principle is: the elastic excitation unit maintains the sensitive structure dominated by the elastic measuring tube in a resonance state, and the measuring tube acts as a“main bending vibration”; When the mass flow flows through the vibrating measuring tube, the resulting“Coriolis effect” Make the measuring tube above“main vibration” on the basis of the resulting direct and flow through“Mass Flow” related“torsional vibration”; By detecting the measuring tube“compound vibration” The mass flow rate of the fluid can be directly obtained. Obviously, the Coriolis mass flowmeter can work stably and reliably, and the key is to ensure that it is in an ideal vibration state, that is, to suppress or minimize its influence in practical applications. 2. Main factors and solutions that affect the measurement performance Or the temperature of the pipeline changes, the stress generated by the pipeline will form pressure, torsion, and tension on the measuring tube of the mass flowmeter, causing asymmetry or deformation of the detection probe, resulting in zero drift and measurement error. Solution: (1) Strictly follow the specifications when installing the flowmeter. (2) After the flowmeter is installed, call out“Zero menu” And record the factory zero preset value. After the zero adjustment, observe the zero value at this time. If the difference between the two values ​​is large (the two values ​​should be guaranteed to be in the same order of magnitude), it means that the installation stress is large and should be reinstalled. 2.2 Environmental vibration and electromagnetic interference When the mass flow meter is working normally, the measuring tube is in a vibrating state and is very sensitive to external vibration. If there are other vibration sources on the same support platform or in the nearby area, the vibration frequency of the vibration source will interact with the working vibration frequency of the mass flowmeter measuring tube, causing abnormal vibration and zero drift of the flowmeter, resulting in measurement errors. It will cause the flowmeter to fail to work; at the same time, because the sensor vibrates the measuring tube by exciting the coil, if there is a large magnetic field interference near the flowmeter, it will also have a great impact on the measurement results. Solution: At present, with the continuous improvement of the production process and technology of mass flow meters, such as the application of DSP digital signal processing technology and MVD technology of Micro Motion, Beijing Tianchen Borui and other companies, compared with the previous analog equipment, the front-end The digital processing of the instrument greatly reduces the signal noise and optimizes the measurement signal. When selecting the instrument, the flowmeter with the above functions should be considered as limited as possible. However, this does not fundamentally eliminate the interference, so the mass flowmeter should be designed and installed away from equipment that generates large magnetic fields such as large transformers and motors to prevent interference with its excitation magnetic field. When vibration interference cannot be avoided, isolation measures such as connecting with the vibration tube with a flexible pipe and a support frame for isolating vibration are taken to isolate the flowmeter from the vibration interference source. 2.3 Influence of the measuring medium pressure When the operating pressure is quite different from the calibration pressure, the change of the measuring medium pressure will affect the degree of tension of the measuring tube and the degree of the Bourdon effect, and destroy the symmetry of the measuring tube, thus causing the flow and density of the sensor to vary. The change of measurement sensitivity cannot be ignored for high-accuracy measurement. Solution: We can eliminate or reduce this effect by pressure compensation and pressure zero adjustment of the mass flow meter. There are two methods for the configuration of pressure compensation: (1) If the operating pressure is a known fixed value, the external pressure value can be input on the mass flowmeter transmitter for compensation. (2) If the operating pressure changes significantly, the mass flowmeter transmitter configuration can be performed to poll an external pressure measurement device, and the real-time dynamic pressure value can be obtained through the external pressure measurement device for compensation. NOTE: Flow verification pressure must be provided when configuring pressure compensation. 2.4 Two-phase flow problem Since the current flowmeter manufacturing technology can only accurately measure single-phase flow, in the actual measurement process, when the working conditions change, the liquid medium will vaporize to form a two-phase flow, which affects the Normal metering.

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