What parameters should be referred to in the selection of gas mass flowmeter?1

What parameters should be referred to in the selection of gas mass flowmeter? With the passage of time, mass flowmeters have been paid more and more attention. In order to meet the characteristics of different types of fluids and solve the problem of mass flow measurement under different flow conditions, there are dozens of types of flowmeters developed and put into use in various countries. There are hundreds of products on sale online. How should gas mass flowmeter manufacturers choose the type within the flow range? The upper limit flow is also called the full scale flow or maximum flow of the flowmeter. When we choose the caliber of the flowmeter, it should be configured according to the flow range used by the measured pipeline and the upper limit flow and lower limit flow of the selected flowmeter, and it cannot be simply matched according to the diameter of the pipeline. Generally speaking, the maximum flow rate of the design pipeline fluid is determined according to the economic flow rate. If the selection is too low, the pipe diameter will be thick and the investment will be large; if it is too high, the transmission power will be large and the operating cost will be increased. For example, the economic flow velocity of low-viscosity liquids such as water is 1.5-3m/s, and that of high-viscosity liquids is 0.2-1m/s. The flow velocity of the upper limit flow of most flowmeters is close to or higher than the economic flow velocity of pipelines. Therefore, when the gas mass flowmeter manufacturer chooses the same caliber as the pipeline, it is more convenient to install. Gas mass flowmeter manufacturers will determine the ratio of the upper limit flow to the lower limit flow. When the value is larger, the flow range will be wider. In general, the wide range of linear instruments is generally 1:10. The range of non-linear flowmeter is only 1:3. A good-quality thermal flowmeter product needs to have two main features: a good probe manufacturing process and a complete real-flow calibration device. It can be seen from the principle that the probe is the core of the entire thermal gas mass flowmeter, and its performance can determine the measurement accuracy, repeatability, service life, and low flow rate characteristics of the flowmeter. Facts have proved that the flowmeter without actual flow calibration measures the non-air medium, and the data deviation is very large. At present, most thermal gas mass flowmeters on the market are calibrated with open-circuit negative pressure air, and then corrected to high pressure conditions, or corrected to other gases, such as argon, carbon dioxide, oxygen, hydrogen, ammonia, etc.

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