Media's influence on the flow meter scale measurement

Abstract: the measuring medium flow meter scale effect of information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Flowmeter measurement of the medium can be a liquid can also be a gas, while the gas and liquid are fluid, but there were significant differences in physical properties. So, fluid density, viscosity, such as the change of the gas composition will be a different impact on fluid. In use. More flow meter manufacturers choose model price quote you are welcome to inquire, media's influence on the flow meter scale below is measurement details. Flowmeter measurement of the medium can be a liquid can also be a gas, while the gas and liquid are fluid, but there were significant differences in physical properties. So, fluid density, viscosity, such as the change of the gas composition will be a different impact on fluid. At the time of use and selection is important to note the change of fluid. （ 1) For the influence of density first zui simple everyone know the density of gas and liquid difference is very big. In the standard state ( Temperature is 20 ℃, and absolute pressure for 101. 325Pa） The air density is 1. 2 kg/m3, and the density of pure water for 999. 8kg/m3。 Low gas density of this characteristic determines the quality standard of gas flow standard device must be designed for high pressure, in order to increase gas density, otherwise, because of tare weight problem will cause the phenomenon of with large scale small, reduce the accuracy. （ 2) For temperature to say is the influence of temperature, gas is affected by temperature also much larger than the liquid, such as in the 100 kpa pressure, air temperature from 20 ℃ to 21 ℃, its density decreases 0. 4%, compared with pure water density decreases only 0, under the same circumstances. 03%. So in water flow measurement, often does not consider the influence of temperature, even if consideration, requirements on accuracy of temperature measurement is not high also. While gas flow metering otherwise, must be treated like a pressure, adjust and control the temperature well, accurately measuring temperature, and to correct the temperature accurately. （ 3) Is to stress the influence of the gas density is small, it is easy to be compressed, so the impact on pressure is much larger than a liquid, such as at 20 ℃, air pressure from 100 kpa to 200 kpa, its density increased by 100%, and under the same conditions of water density increase only 0. 01%. So in water flow measurement, can take water as incompressible fluid, in addition to require high measurement accuracy, is generally not considered pressure correction. Gas flow measurement, otherwise, must be very well to adjust and control the pressure, to accurately measure the pressure, and to correct the pressure correctly. （ 4) For the effects of gas viscosity was much lower than the liquid viscosity, such as under the 20 ℃, and 100 kpa, dynamic viscosity of air to 1. 8× 10 - 5 pa· S, while the dynamic viscosity of water is 1 & times; 10 - 3 pa· s。 So want to consider the influence of viscosity liquid flow measurement, especially the volume of liquid flow standard device, due to the liquid viscosity, adhesion when empty container in the vessel wall out, caused the error. For gas, generally do not consider the effect of viscosity. Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.

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