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Mass flow meter manufacturers share mass flow meters to choose indirect or direct methods

Mass flow meter manufacturers share indirect or direct analysis of the selection of mass flow meters
1) When selecting a mass flow meter, first consider whether it is direct or indirect. It can be considered according to the performance characteristics, application range, accuracy requirements and cost of the two mass flow meters.
2) If a high-precision volumetric flowmeter (such as a (0.2%-0.5%) R volumetric flowmeter) is used in the first type of mass flowmeter, the accuracy is preferably (0.5% to 1%). R is usually lower. The second type of combination (dual flow meter) is between (1% and 2.5%) FS.
3) For liquid flow measurement, the density-volume flow method, the temperature integrated flow method or the dual flow meter method can be used. Generally, no pressure correction is required, because the influence on the liquid density is negligible in the normal pressure variation range (for example, heavy oil is compressed by 0.45% when the pressure is increased from 0.5 MP to 6 MP) c
4) The density-volume flow method should consider the adaptability of the selected density meter to the measured fluid. There are two ways to select the density of the fluid in the pipeline on the density meter side: one is to insert the densitometer directly into the pipeline; the other is Connect the densitometer to the split line of the main pipe.
5) Due to the small range of the differential pressure flowmeter in the dual flowmeter method, the range of use is affected, but the dual flowmeter method can solve the problem of not having a suitable density meter when measuring gas:
6) When measuring gas, the pressure/temperature-volume flow method is most common. There are many types of such flowmeters, such as flow computers, flow display totalizers with arithmetic functions, and intelligent flow totalizers. The functions vary greatly. Detailed information should be obtained from the manufacturer when selecting. Some models are only suitable for measurements such as air that are closer to the ideal gas, while others are available for natural gas and steam.

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