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What are the types of flow meters? Flow meter is a professional automated measuring instrument, whose main function is to measure the flow rate of fluids, including liquids, gases, steam, mixed slurries, solid dust, etc. It is precisely the special role of flow meters that in the field of industrial automation, flow meters and sensors are called the eyes of automation systems. The measurement results are transmitted to the upper computer system, which integrates and analyzes the data, and then applies the preset solutions to the upstream and downstream control systems to achieve intelligent automatic control. Common flow meters include: measuring cleaning liquids such as electromagnetic flow meters, ultrasonic flow meters, vortex flow meters, mass flow meters, orifice flow meters, turbine flow meters, metal rotor flow meters, etc. Measuring gases such as vortex flow meters, V-cone flow meters, orifice flow meters, balance flow meters, waist wheel flow meters (Roots), gas mass flow meters, etc. Measuring steam such as orifice flow meters, vortex flow meters, bend flow meters, etc. Measuring slurries such as electromagnetic flow meters. Users should choose the correct flow meter according to the requirements of the application scenario. Choosing the wrong flow meter will not only affect the project and production, but also cause unnecessary losses to the control system. If you are interested in measuring the flow rate of liquids, you can learn about TSD electromagnetic flow meters, which have high product accuracy and are suitable for various environments. 2. What is Coriodolli? How does the Coriolis flowmeter work?
Principle of Mass Flow Measurement: The measurement system of a mass flow meter includes
(1) normal acceleration, i.e. centripetal acceleration α r, with a magnitude equal to 2 ω r, facing the P axis;
(2) Tangential angular velocity α t, also known as Coriolis acceleration, has a value equal to 2 ω V and is perpendicular to α r. Due to composite motion, a Coriolis force Fc=2 ω Vm acts on the particle in the α t direction, and the pipeline exerts a reverse force Fc=-2 ω Vm on the particle. When a fluid with a density of ρ flows at a constant velocity V in a rotating pipeline, any section of the pipeline with a length Δ x will experience a tangential Coriolis force Δ Fc: Δ Fc=2 ω V ρ A Δ x
(1), where A represents the cross-sectional area of the pipeline. Due to the existence of the relationship equation: qr=ρ VA, Δ Fc=2 ω qm Δ x
(2) Therefore, directly or indirectly measuring the Coriolis force of the fluid flowing in a rotating tube can determine the mass flow rate. Inside the sensor is a U-shaped flow tube. When there is no fluid flowing through the flow tube, the flow tube is driven by an electromagnetic drive coil installed at the end of the flow tube, with an amplitude of less than 1mm and a frequency of about 80Hz. When the fluid flows into the flow tube, it is forced to accept the vertical movement of the flow tube. During the half cycle of upward vibration of the flow tube, the fluid resists the upward movement of the tube and exerts a downward force on the flow tu
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