Classification principle and application of flowmeter

Abstract: The classification principle and application information of flowmeters are provided by excellent flowmeter and flowmeter manufacturers. 1. Classification of flowmeters According to the measurement principle, there are: mechanical principle, thermal principle, acoustic principle, electrical principle, optical principle, atomic physics principle, etc. According to the structural principle of the flowmeter, it is divided into: positive displacement flowmeter, differential pressure flowmeter, float flowmeter, etc. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the classification principle and application details of flowmeters. 1. The classification of flowmeters is based on the measurement principle, including: mechanical principle, thermal principle, acoustic principle, electrical principle, optical principle, atomic physics principle, etc. According to the structure principle of the flowmeter, it is divided into: positive displacement flowmeter, differential pressure flowmeter, float flowmeter, turbine flowmeter, electromagnetic flowmeter, vortex flowmeter and mass flowmeter in fluid oscillating flowmeter. , insertion flowmeters and probe flowmeters. 2. Working principle and application of commonly used flow meters An instrument to calculate flow. Uses: Differential pressure flowmeters are widely used in the flow measurement of closed pipelines, such as fluid: single-phase, mixed-phase, clean, dirty, viscous flow, etc. Work: normal pressure, high pressure, vacuum, normal temperature, high temperature, low temperature, etc. Pipe diameter: from several millimeters to several meters; flow: subsonic, sonic, pulsating flow, etc. Its usage in various industrial sectors accounts for about 1/4 to 1/3 of the total flowmeter usage. 2. Float flowmeter A rotameter, also known as a rotameter, is a variable area flowmeter. In the vertical conical tube that expands from bottom to top, the gravity of the circular section float is borne by hydrodynamic forces, so the float can rise and fall freely in the conical tube. Uses: Float flowmeter is the most widely used flowmeter after differential pressure flowmeter, especially in small flow and micro flow occasions 3. Positive displacement flowmeter Volumetric flowmeter, also known as constant displacement flowmeter, or simply referred to as PD flow meter, one of the most accurate flow meters. It uses a mechanical measuring element to continuously divide the fluid into a single known volume portion and measures the total volume of the fluid based on the number of times the measuring chamber is repeatedly filled and expelled with fluid in that volume portion. Uses: Positive displacement flowmeters, differential pressure flowmeters and float flowmeters are listed as the three most widely used flowmeters, and are often used to measure the total amount of expensive media (oil, natural gas, etc.). ). 4. Turbine Flow Meters Turbine flow meters are the main type of velocity flow meters that use a multi-blade rotor (turbine) to sense the average flow rate of a fluid and infer the flow or total volume. Generally speaking, it consists of two parts: sensor and display instrument, or can be integrated. Uses: Turbine flowmeters are widely used to measure petroleum, organic liquids, inorganic liquids, liquefied gas, natural gas and cryogenic fluids. 5. Electromagnetic flowmeter An electromagnetic flowmeter is an instrument that measures conductive liquids according to Faraday's law of electromagnetic induction. Application: Electromagnetic flowmeters have a series of excellent characteristics, which can solve problems that other flowmeters are not easy to apply, such as measuring dirty flow and corrosive flow. Electromagnetic flowmeters are widely used in water supply and drainage projects, and large-diameter meters are most used in water supply and drainage projects. Small and medium calibers are usually used in demanding or unpredictable applications, such as blast furnace tuyere cooling water control in the steel industry, pulp and black liquor measurement in the paper industry, highly corrosive liquids in the chemical industry, and pulp in the non-ferrous metallurgical industry. Small caliber and small caliber are often used in places with hygienic requirements such as pharmaceuticals, food, and biochemistry. 6. Vortex flowmeter A vortex flowmeter is an instrument that places a streamlined vortex generator in the fluid. The fluid alternately separates and releases two series of regularly interlaced vortex generators on both sides of the generator. When the flow cross section is constant, the flow is proportional to the flow of the pilot volume. Therefore, the flow rate can be measured by measuring the oscillation frequency. Application: The vortex flowmeter has developed rapidly and has now become a general-purpose flowmeter. 7. Ultrasonic flowmeter The ultrasonic flowmeter is designed according to the principle that the speed of ultrasonic waves in the flowing medium is equal to the geometric sum of the average speed of the measured medium and the speed of the sound wave itself. It also reflects the flow rate by measuring the flow rate. According to the measurement principle, ultrasonic flowmeters can be divided into time difference type and Doppler type. Application: The propagation time method is suitable for clean single-phase liquids and gases. Typical applications include plant discharge liquids, strange liquids, LNG, etc. In gas applications, there is good experience in the field of high pressure natural gas; the Doppler method is suitable for two-phase fluids with low heterogeneity content, such as untreated sewage, plant wastewater and dirty process fluids,But usually not for very clean liquids. 8. Mass flowmeter Mass flowmeter is divided into direct type and indirect type. Direct mass flow meters measure using a principle directly related to mass flow; indirect mass flow meters use a density meter to multiply volume flow indirectly to obtain mass flow.

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