Mass flow meter pressure loss | Mass flow rate pressure loss calculation formula

『Pressure loss 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. The fifth drawback of Coriolis mass flowmeter is that it cannot be used to measure fluid media with low density, such as low-pressure gases; When the gas content in a liquid exceeds a certain value, it will significantly affect the measurement value. So far, there has been no practical example of successfully measuring gas-liquid two-phase flow using CMF. 2) Most CMF flow sensors are sensitive to external vibration interference and require high installation and fixation to prevent the impact of pipeline vibration. 3) It cannot be used for measuring the flow rate of large pipes, and is currently limited to DN I SO - DN200mm and below. 4) The wear, corrosion or deposition of scale on the inner wall of the measuring pipe will affect the measurement accuracy, especially for the CMF of thin-walled measuring pipes. 5) Most models of CMF have a large volume and weight. The pressure loss is also significant. 6) The price is expensive, about 2-5 times or more than the same n-diameter electromagnetic flowmeter. 10.1.3 Application of Coriolis mass flowmeter Although CMF has many valuable advantages and is relatively complete from the perspective of lateral measurement principle, there are still some problems and shortcomings in its application due to the short time it has been commercialized. In recent years, although some problems have been solved to a certain extent through the continuous efforts of various manufacturing factories, there are still many problems that cannot be fundamentally solved a month ago, and even peoples understanding of some problems is not enough. In summary, there are several aspects. I. The zero drift problem, also known as zero stability, has always been a concern for CMF, and it is still difficult to theoretically analyze the true cause of zero drift. From a working principle perspective, the characteristics of CMF do not seem to be affected by fluid properties, flowmeter structure, and installation methods, but a large number of practical applications have shown that this is not the case. Analyze the reasons behind it Mainly due to the existence of small amplitude approximation and no attenuation approximation in the theoretical model of the working principle. The asymmetry of mechanical vibration and attenuation may be the two fundamental reasons for instrument zero drift. In the application practice of CMF, the asymmetry of boundary conditions objectively exists, such as the fixing method at both ends of the detection tube, the stiffness of the vibration tube, the difference in natural frequency of the double tube, and the internal attenuation of the material. Practice has shown that changes in the density and dryness of fluid media also affect the zero position of instruments This may be caused by structural imbalance, and density changes leading to changes in the natural frequency of the entire measurement system are also one of the reasons. In summary, although CMF manufacturers have taken many measures to suppress zero drift in manufacturing and debugging processes, the zero drift of CMF still exists to some extent. A well-designed, carefully crafted, and tuned quality flow can minimize zero drift to the greatest extent possible. If there are design problems or the structure is not reasonable enough, the impact of zero drift will become intolerable. Since zero drift is a fixed value, its impact becomes significant at the lower limit of flow. For example, the double Sl type CMF of a certain UN25 has a zer

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