Comparison of flow meters | Comparison of pressure loss between orifice flow meters and Velbar flow meters

『Comparison of flow meters』Related information(flow rotameter|digital flow meter|balo meter|hydraulic flow meter|volumetric meter|positive displacement meter|pitot tube flow meter|displacement meter|cfm meter|variable area flow meter|inline flow meter|differential pressure flow meter|calibrated flow meter|velocity meter|paddle wheel flow meter|oval gear flow meter|anemometer hvac|multiphase flow meter|doppler flow meter|thorpe tube flowmeter|heat flow meter)

1. Types and Differences of Flowmeters

Flowmeters are mainly divided into volumetric, velocity, differential pressure, mass, and other categories based on their measurement principles. The core differences lie in their working principles, applicable dielectric properties, and accuracy characteristics. 1. Working principle of volumetric flowmeter: The fluid is divided into fixed volume units by mechanical measuring elements, and the flow rate is calculated by counting the number of units. Representative types: elliptical gear, waist wheel, scraper flowmeter. Applicable medium: high viscosity liquids (such as oils, chemical reagents). Accuracy: ± 0.2%~± 0.5% (higher). Characteristics: Sensitive to changes in fluid viscosity, filters need to be installed to prevent jamming. Working principle of velocity flowmeter: flow rate is derived by measuring fluid velocity, usually requiring matching pipeline size data. Representative type: • Electromagnetic flowmeter: Based on Faradays law of electromagnetic induction, it measures conductive liquids (such as water, acidic and alkaline solutions) with an accuracy of ± 0.2%~± 0.5% and no pressure loss. Turbine flowmeter: By driving the turbine to rotate with fluid, it measures low viscosity liquids or gases (such as tap water and natural gas) with an accuracy of ± 0.5%~± 1%, requiring a straight pipe section. • Ultrasonic flowmeter: uses the time difference of sound waves propagating in the fluid to measure speed, suitable for large-diameter pipelines (such as municipal water supply), with an accuracy of ± 1%~± 2%, and can be externally clamped.

3. Differential pressure flowmeter working principle: Based on the Bernoulli equation, the flow rate is calculated by measuri

ng the pressure difference before and after the throttling element. Representative types: orifice plate, V-cone, Venturi tube. Applicable media: steam, gas, liquid (widely used). Accuracy: ± 1%~± 2% (greatly affected by installation conditions). Characteristics: The structure is simple but there is permanent pressure loss, requiring a differential pressure transmitter and a pressure pipe. 4. Working principle of the mass flowmeter: It directly measures the mass flow rate of the fluid without density compensation. Representative type: Coriolis flowmeter: utilizing the Coriolis force balance effect generated by the flow of slag in a vibrating tube, with an accuracy of ± 0.1%~± 0.2%, capable of simultaneously measuring density and temperature. • Thermal mass flowmeter: measures gas mass flow rate (such as compressed air, combustion gas) through heating elements and temperature sensors, with an accuracy of ± 1%~± 2.5%

5. Other special types • Vortex flowmeter: measures steam, gas or liquid flow rate by detecting vortex shedding frequency, with an accuracy of ± 1%, and is resistant to high temperature and high pressure. Rotary flowmeter: based on the change of float position to measure small flow liquids or gases, with an accuracy of ± 1%~± 2.5%, commonly used in laboratories. Key selection factors comparison: | Type | Typical accuracy | Applicable medium | Installation requirements | Pressure loss situation | | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------Pressure loss | | Coriolis | ± 0.1%~± 0.2% | Liquid/Gas/Slurry | No straight pipe requirements | Medium | Note: Precision data refers t

Comparison of flow meters | Comparison of pressure loss between orifice flow meters and Velbar flow meters

1. Types and Differences of Flowmeters

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