How to choose a mass flow meter for measurement? 1. When choosing a mass flowmeter, you should first consider whether to use a direct type or an indirect type. You can consider the performance characteristics, scope of application, accuracy requirements, and cost of the two mass flowmeters. 2. If a high-precision volume flowmeter (such as (0.2%-0.5%) R volumetric flowmeter) is used in the first type of combined mass flowmeter, the accuracy can best reach (0.5%-1 %) between R, usually lower. Type 2 combined method (dual flow meter method) is between (1%-2.5%) FS. 3. When used for liquid flow measurement, density-volume flow method, temperature-volume flow method or double flowmeter method can be used. Generally, no pressure correction is required, because within the usual range of pressure changes, the influence on liquid density is negligible (for example, heavy oil is compressed by 0.45% when the pressure increases from 0.5MP to 6MP.) c4. Use the density-volume flow method The adaptability of the selected density meter to the measured fluid should be considered. There are two connection methods for the density of the fluid in the pipeline on the side of the density meter: one is to insert the density meter directly into the pipeline; the other is to connect the density meter to the main pipeline. on the diversion pipe. 5. Due to the small range of the differential pressure flowmeter in the double flowmeter method, the scope of use is affected, but the double flowmeter method can solve the problem of not having a suitable density meter when measuring gas. 6. When used to measure gas, the pressure/temperature-volume flow method is the most common. The volume of fluid is a function of fluid temperature and pressure, and is a dependent variable, while the quality of fluid is a quantity that does not change with time, space temperature, and pressure. As mentioned above, the flow measurement values of commonly used flowmeters, such as orifice flowmeters, turbine flowmeters, vortex flowmeters, electromagnetic flowmeters, rotor flowmeters, ultrasonic flowmeters and oval gear flowmeters, are fluid volume flow.
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