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Accurate selection of mass flow meters for small flow measurement requires comprehensive consideration of fluid characteristics, measurement accuracy requirements, flow range, installation requirements, maintenance, and ease of operation, as follows:
1. Fluid characteristics Fluid type: Liquid small flow rate: Low viscosity liquids (such as water and alcohol) can be selected as vortex or thermal mass flow meters, turbine type uses fluid to impact turbine blades to measure speed and calculate flow rate, which is more accurate when measuring small flow rates of reagents such as methanol in laboratory chemical reagent addition systems;
; Coriolis mass flowmeter is selected for high viscosity liquids (such as silicone oil and glycerin), which will not be affected by fluid viscosity changes. Micro flow of raw materials such as high viscosity essence liquid for cosmetics production can ensure accuracy. Small gas flow rate: Thermal mass flow meters are commonly used for ordinary gases (such as nitrogen and argon). Based on the principle of thermal conduction, the flow rate is calculated by measuring the heat carried away by the gas. Electronic chip manufacturing gas delivery systems can supply high-purity gas with small flow rates to meet demand; For gases with strong compressibility (such as hydrogen), considering the effects of pressure and temperature changes, choose a mass flow meter with temperature and pressure compensation functions (such as some high-precision thermal mass flow meters). Fluid temperature and pressure range: In high-temperature environments (such as adding trace reagents in high-temperature chemical reactions), select a mass flow meter that can withstand high temperatures and has effective temperature compensation function; In high-pressure environments (such as micro leak detection in high-pressure gas filling systems), flow meters that can withstand the corresponding high pressure and consider the impact of pressure changes on performance should be selected. Specially designed Coriolis mass flow meters can operate at higher pressures and have high accuracy in measuring small flow rates. Chemical properties: When the fluid is corrosive (such as measuring the flow rate of trace acid solution in chemical etching process) or has special chemical properties, flow meters made of corrosion-resistant materials (such as polytetrafluoroethylene lining, Hastelloy alloy) should be selected to prevent corrosion from affecting accuracy and service life. Special chemical reagents should also consider whether there is a chemical reaction with the flow meter material.2. Measurement Accuracy Requirements Accuracy Level: The accuracy level for measuring small flow rates is usually high. For high-precision medical equipment (such as micro drug injection pumps), the accuracy level of mass flow meters may need to reach ± 0.1% or even higher. High precision flow meters are also required for controlling the flow rate of trace reagents in scientific research experiments to ensure the accuracy of the results.
. Repeatability accuracy: In continuous micro flow measurement processes (such as automated microfluidic chip manufacturing), good repeatability accuracy (such as repeatability error within ± 0.05%) can ensure consistency in each measurement, which is crucial for stable product quality and accurate control of the production process. 『SILVER Official Website SERVICE』
