Key points of use of glass rotameter

Key points for the use of glass rotameters (1) Influence on density First of all, in terms of density, the density of gas is very different from that of liquid. The density of water is 1.2kg/m3, while the density of pure water is 999.8kg/m3. Therefore, for some of the same caliber, such as DN15 flowmeter, the maximum flow rate of liquid can be 1m3/h, and the flow rate of gas can be 10m3/h. The other is that each flowmeter of Chengfeng Instrument has been calibrated, and is calibrated according to different densities and ranges, so the position of the scale line will be different with different densities. (2) Regarding the influence of temperature, let’s talk about temperature again. Gas is also much more affected by temperature than 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 only decreases by 0.03%. Therefore, in water flow measurement, the influence of temperature is often not considered, even if it is considered, the requirement for the accuracy of temperature measurement is not high. However, the gas glass rotameter does not need to adjust and control the temperature as well as the pressure, accurately measure the temperature, and correct the temperature correction. (3) Effect on pressure Gas has a small density and is easy to be compressed, so the effect on pressure is much greater than that of liquid. For example, at 20°C, the air pressure increases from 100kPa to 200kPa, and its density increases by 100%. Under the same conditions, the density of water only increases by 0.01%. Therefore, in water flow measurement, water can be regarded as an incompressible fluid, and pressure correction is generally not considered except for measurement that requires high accuracy. Gas flow metering is not the case, requiring good regulation and control of pressure, accurate measurement of pressure, and correct pressure correction. (4) Effect 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 liquid flow measurement, especially the volumetric liquid flow standard device. Due to the high viscosity of the liquid, when the container is emptied, it will stick to the container wall and cannot be discharged, causing errors. For gases, the influence of viscosity is generally not considered.

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