Five minutes! Take you to fully understand all kinds of flowmeters!

There are many kinds of flowmeters according to the working principle. When selecting the type, it is necessary to choose the suitable flowmeter according to the actual working conditions. Today, I have summarized the working principles of various flowmeters for you, hoping to be helpful to you. Differential pressure flowmeter The differential pressure flowmeter is an instrument that calculates the flow rate based on the differential pressure generated by the flow detection piece installed in the pipeline, the known fluid conditions and the geometric dimensions of the detection piece and the pipeline. The differential pressure flowmeter consists of a primary device (detection piece) and a secondary device (differential pressure conversion and flow display instrument). Differential pressure flowmeters are usually classified in the form of detection parts, such as orifice flowmeters, Venturi flowmeters, and uniform velocity tube flowmeters. The secondary devices are various mechanical, electronic, electromechanical integrated differential pressure gauges, differential pressure transmitters and flow display instruments. It has developed into a large class of instruments with a high degree of three modernizations (serialization, generalization and standardization) and a large variety of specifications. It can measure both flow parameters and other parameters (such as pressure, level, density, etc.) ). The detection parts of the differential pressure flowmeter can be divided into several categories according to their working principles: throttling device, hydraulic resistance type, centrifugal type, dynamic pressure head type, dynamic pressure head gain type and jet type. Differential pressure flowmeter is a kind of widely used flowmeter, and its usage accounts for most of all kinds of flowmeters. In recent years, due to the advent of various new flowmeters, its usage percentage has gradually declined, but it is still an important type of flowmeter. Target flowmeter The target flowmeter began to be used in industrial flow measurement in the 1960s. It is mainly used to solve the flow measurement of high-viscosity and low Reynolds number fluids. It has experienced two development stages of pneumatic meters and electric meters. SBL series intelligent The target flowmeter is based on the measurement principle of the original strain gauge (capacitance) target flowmeter. A new type of flow meter. Volumetric flowmeter Volumetric flowmeter, also known as constant displacement flowmeter, referred to as PD flowmeter, is a type of precision in flow meters. It uses mechanical measuring elements to continuously divide the fluid into a single known volume, and measures the total volume of the fluid according to the number of times the measuring chamber is filled and discharged with the volume of fluid. Volumetric flowmeters are classified according to their measuring components, and can be divided into oval gear flowmeters, scraper flowmeters, double rotor flowmeters, rotary piston flowmeters, reciprocating piston flowmeters, disc flowmeters, and liquid-sealed drum flowmeters , wet gas meter and membrane gas meter, etc. Turbine flowmeter Turbine flowmeter is the main type of velocity flowmeter. It uses a multi-blade rotor (turbine) to sense the average flow velocity of the fluid, and then derives the flow or total amount of the instrument. Generally, it consists of two parts, the sensor and the display, and it can also be made into an integral type. Turbine flowmeters, positive displacement flowmeters, and mass flowmeters are three types of products with high repeatability and high precision in flowmeters, and they are regarded as type flowmeters. Electromagnetic flowmeter Electromagnetic flowmeter is an instrument for measuring conductive liquids made according to Faraday's law of electromagnetic induction. The electromagnetic flowmeter has a series of excellent features, which can solve the problems that other flowmeters are not easy to apply, such as the measurement of dirty flow and corrosion flow. Vortex flowmeter A vortex flowmeter is an instrument that places a non-streamlined vortex generator in the fluid, and the fluid separates alternately on both sides of the generator to release two strings of regularly staggered vortices. Vortex flowmeters can be divided into: stress type, strain type, capacitive type, thermal type, vibration type, photoelectric type and ultrasonic type according to frequency detection methods. Ultrasonic flowmeter Ultrasonic flowmeter is an instrument that measures flow by detecting the effect of fluid flow on ultrasonic beams (or ultrasonic pulses). According to the principle of signal detection, ultrasonic flowmeter can be divided into propagation velocity difference method (direct time difference method, time difference method, phase difference method and frequency difference method), beam offset method, Doppler method, cross correlation method, spatial filtering method and noise methods, etc. the

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