Influence of measuring medium on flow meter

Abstract: The information on the influence of the measuring medium on the flow meter is provided by the excellent flow meter and flow meter manufacturers. The medium measured by the flow meter can be either liquid or gas. Although both gas and liquid are fluids, they have very different physical properties. Therefore, changes in fluid density, viscosity, and gas composition will have different effects on the fluid. In use. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article on the influence of the measuring medium on the flowmeter. The medium measured by the flow meter can be either liquid or gas. Although both gas and liquid are fluids, they have very different physical properties. Therefore, changes in fluid density, viscosity, and gas composition will have different effects on the fluid. Be sure to pay attention to fluid changes when using and selecting models. (1) Influence on density First of all, we all know that the density difference between gas and liquid is very large. In the standard state (temperature is 20℃, absolute pressure is 101.325Pa), the density of air is 1.2kg/m3, while the density of pure water is 999.8kg/m3. This feature of low gas density determines that the gas flow standard device of the mass method must be designed to be high pressure to increase the gas density. Otherwise, the tare problem will cause the phenomenon of weighing small objects with a large scale and reduce the accuracy. (2) For the effect of temperature, another thing to say is the temperature. The effect of the gas is also much larger than that of the liquid. For example, under the pressure of 100kPa, the air temperature rises from 20°C to 21°C, and its density decreases by 0.4%. Under the same conditions, the density of pure water is only reduced by 0.03%. Therefore, in the measurement of water flow, the influence of temperature is often not considered, and even if it is considered, the accuracy of temperature measurement is not high. The gas flow measurement is not the case, the temperature must be well regulated and controlled like the pressure, the temperature must be accurately measured, and the temperature correction must be performed correctly. (3) Influence on pressure Gas has a very small density and is easily compressed, so the influence on pressure is much larger than that of liquid. For example, at 20 °C, when the air pressure rises from 100kPa to 200kPa, its density increases by 100%. Under the same conditions, the density of water increases by only 0.01%. Therefore, in the measurement of water flow, water can be regarded as an incompressible fluid. Except for the measurement that requires high accuracy, pressure correction is generally not considered. This is not the case with gas flow metering, where pressure must be well regulated and controlled, pressure measured accurately, and pressure corrected correctly. (4) Influence on viscosity The viscosity of gas is much lower than that of liquid. For example, at 20°C and 100kPa, the dynamic viscosity of air is 1.8×10-5Pa·s, while the dynamic viscosity of water is 1×10-3Pa·s. Therefore, the influence of viscosity should be considered in the liquid flow measurement, especially the volumetric liquid flow standard device. Due to the high viscosity of the liquid, the container will adhere to the container wall and cannot be discharged when it is emptied, resulting in errors. For gases, the effect of viscosity is generally not considered. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Influence of measuring medium on flow meter'

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