Installation and use experience of gas mass flowmeter

The gas mass flowmeter is the instrument with the most accurate medium flow detection and the lowest installation requirements in the existing industrial production. Because it can directly detect the quality, density and temperature of the medium flowing through the internal measuring tube of the instrument, there is no strict requirement for the flow state of the medium. Laminar flow requirements, so there is no straight pipe section requirement for the pipeline before and after the flowmeter during the installation process, and it can be installed arbitrarily like a regulating valve, which greatly facilitates the construction and installation on site. Gas mass flowmeters have various shapes, but their internal structures are almost the same. Basically, they are composed of two U-shaped measuring tubes. Three coils are installed on the bottom and left and right sides between the two measuring tubes. The coil at the bottom is the excitation coil. , the two coils on the left and right have a detection mass and a detection density. In addition, a thermal resistance is buried inside the measuring tube to detect the temperature of the medium. Since the mass flowmeter can detect the density of the medium in real time without artificially setting a constant density of the medium, the detection value of the mass flowmeter is accurate and reliable, and the construction and installation are simple and convenient. Although the measuring tube of the mass flowmeter is inside the shell, the external stress can still produce unmeasurable additional errors in the detection, such as the fixed iron wire of the heating line in the figure, which is deformed due to the influence of temperature during operation and causes a randomly changing stress overlay. The laying of the heating wire should also have a certain distance from the mass flow meter to prevent the asymmetric stress generated by the thermal expansion of the heating wire and the excessive heat conduction from affecting the temperature detection of the mass flow meter medium.

In the past few decades, rosemount coriolis mass flow meter production has increased because of the use of mass flow meter.

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