How to Improve the Practical Accuracy of Mass Flow Meters1

Abstract: How to improve the practical accuracy of mass flow meters is provided by excellent flow meter and flow meter manufacturers. How to Improve the Practical Accuracy of Mass Flow Meters , and root. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the article details on how to improve the practical accuracy of mass flowmeters. How to Improve the Practical Accuracy of Mass Flow Meters , and the volume flow of the fluid can be derived according to the mass flow and density parameters measured above. 1 The working principle of Coriolis mass flowmeter The Coriolis mass flowmeter uses the phase difference of the vibration frequency of the two halves of the measuring tube (also called the vibrating tube) to be proportional to the mass flow to measure the mass flow. Density is obtained from the functional relationship between the density of the medium being measured in the tube. Coriolis mass flow meters can also be derived from the two basic parameters mass flow qm and densityρThe volume flow qv is obtained. 2 Factors Affecting the Practical Accuracy of Coriolis Mass Flow Meters Coriolis mass flow meters are electromagnetically driven mechanical vibration type flow measuring instruments. influences. The flow measurement tube (also called flow vibration tube) installed in the pipeline will be affected by the mechanical vibration, mechanical stress, and mechanical torque of the factory pipeline. In addition, the error characteristics of the Coriolis mass flowmeter itself show“loudspeaker”, rather than presenting a flat line with different flows. In view of the above reasons, the measures to improve the practical accuracy of the Coriolis mass flowmeter are: 1) According to the actual process parameters of the Coriolis mass flowmeter, carry out“Personalized Standards”, so as to realize that the actual measurement error (difference from the standard value) of the Coriolis mass flowmeter tends to zero within a certain range of the actual use flow point; 2) Make sure the installation of the Coriolis mass flowmeter , reduce or eliminate the influence of mechanical stress, mechanical torsion and mechanical vibration on the use of the flowmeter; 3) Consider the influence of process pressure, temperature, etc. on the measurement accuracy of the Coriolis mass flowmeter; 4) Make a good Coriolis mass flowmeter The use of mass flowmeters is beneficial. 3 Scheme 3.1 Implementation of Achieving Practical Accuracy of Coriolis Mass Flow Meters“Personalized Standards”scheme to achieve a flow measurement close to zero error Coriolis mass flowmeter error formula: In the formula: E allows—The allowable error of the flowmeter; E0—Accuracy class of flowmeter; qz—Zero drift value of the flowmeter;—The current measurement value of the flowmeter. It can be seen that the error characteristic curve of the Coriolis mass flowmeter is shown in Figure 1. Figure 1 Error characteristic curve of Coriolis mass flowmeter For the error characteristic of Coriolis mass flowmeter, combined with the actual use process, the Coriolis mass flowmeter only works in a relatively small flow range, so it can be Try to make the flow meter within a certain range of the actual use flow point (usually control this range as the actual use flow point±20%) of the measurement error tends to zero, for this reason, the liquid flow standard device can be used to set the flow verification point according to the national mass flow meter verification regulations (JJG1038-2008), and the actual flow point of the flow point can be measured.±20% range of point calibration (at least three points: 80% Q actual, Q actual, 120% Q actual), to achieve the mass flow meter“Personalized Standards”, its main purpose is not only to make its standard results meet the requirements of the mass flow meter verification regulations, but also to make the mass flow meter in the actual use flow point±Within the range of 20%, the measurement error of the three points of the sampling standard tends to zero, and the special thing to do is to make the measurement error of the actual flow point (difference between the indicated value of the flowmeter and the standard value of the standard device) zero, only in this way ,Mass flowmeter“Personalized Standards”work is completely completed. According to the above assumptions, a mass flow meter numbered: 14005601 is carried out.“Personalized Standards”, learned from the factory that the actual flow point of the flowmeter is: 21.7t/h, and the maximum flow rate is: 43.6t/h. According to the requirements of the national mass flowmeter verification regulations (JJG1038-2008), it is verified and verified. As a result, the indication error at 21.7t/h is: -0.153%. Judging from the above data, the measurement accuracy of the mass flowmeter is not very high at the actual use point of 21.7t/h. Therefore, according to the above data, the flowmeter is adjusted, and its flow calibration coefficient is increased by 0.153%, and then According to this“Personalized Standards”The method is used to standardize the flowmeter, and the indication error of the re-standard result at 21.7t/h is: 0.002%.

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