Classification of flow measuring instruments

Abstract: Information on the classification method of flow measuring instruments is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. There are many ways to measure flow. The measurement principle and the structure of the applied measuring instrument are different. At present, there are many classification methods for flow measurement. This book only cites a human-induced classification method. The brief introduction is as follows: (1) Velocity flowmeter This is a kind of fluid measurement. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of the classification method of flowmeters. There are many ways to measure flow. The measurement principle and the structure of the applied measuring instrument are different. At present, there are many classification methods for flow measurement. This book only cites one kind of classification method. The introduction is as follows: (1) Velocity flow address meter This is a kind of calculation based on the measurement of the flow velocity of the fluid in the pipeline as the basis for the location measurement. flow meter. Because if the flow cross-sectional area A of the fluid to be measured is known, then as long as the flow velocity v of the fluid is measured, the volume flow Q=vA of the fluid can be obtained. Velocity flow measuring instruments based on this principle can be divided into two working modes: one is a flow measuring instrument that directly measures the fluid flow rate, such as electromagnetic flowmeters, ultrasonic flowmeters, and related flowmeters. The feature of this working method is that it is not necessary to set detection elements in the pipeline. Therefore, the flow state of the fluid will not be changed, and there will be no pressure loss. There is no problem such as pipeline blockage. Another way of working is to convert the flow velocity of the fluid to be measured into signals such as pressure difference, displacement, rotational speed, frequency, etc. , thereby indirectly measuring the maximum flow. The flow and location instruments that work in this way mainly include differential pressure flowmeters, float flowmeters, turbine flowmeters, vortex flowmeters, and target flowmeters. (2) Positive displacement flowmeter This is an instrument that calculates the flow m based on the number of fixed volumes of the fluid discharged per unit time as the measurement basis. For example, oval gear flowmeter, piston flowmeter, waist wheel flowmeter, disc flowmeter, etc. (3) Mass flowmeter This is a flowmeter based on the measurement of the mass J M that the fluid flows through. According to the relationship between mass flow and volume flow (formula ((2-3-2)), the velocity type (or volume type) flow location measuring instrument is used to measure the volume flow (or total volume) first, and then multiply by The density of the fluid to be measured can be used to obtain the mass flow (or total mass). An instrument that indirectly measures mass flow based on this principle is called a derivation (indirect) mass flowmeter. Since the density of the medium will vary with pressure, Therefore, the derivation mass flowmeters generally used in the industry usually take automatic compensation measures for temperature and pressure. In order to make the measured mass flow value not affected by changes in fluid pressure, temperature, viscosity, etc. A direct mass flow meter that directly measures fluid mass flow is under development. For example, thermal mass, angular motion basin, gyroscopic and Coriolis force type, etc. Among them, thermal mass flow meters have been used in It has been applied in the industry. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our manufacturer. 'Classification Method of Flow Measuring Instruments'

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