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1. Doppler flowmeter manufacturer
2. Types and principles of flowmeters
Types and principles of flowmeters. Flowmeters are instruments used to measure fluid flow in pipelines or open channels, with a wide variety of types that can be classified into multiple types based on different measurement principles and structures. Here are several common flow meters and their working principles:
1. Classification according to measurement principles. Mechanical principles. Differential pressure flow meter: Using Bernoullis theorem, the flow rate is calculated by measuring the differential pressure of the fluid in the pipeline. For example, orifice flow meters, wedge flow meters, Venturi tube flow meters, etc. These flow meters typically consist of a primary device (such as a throttling device) and a secondary device (display instrument), which calculate the flow rate by measuring the pressure difference of the fluid before and after the throttling device. Rotary flowmeter: Using the momentum theorem, the flow rate is reflected by measuring the speed at which the fluid drives the rotor to rotate. The rotor (float) rotates or rises and falls with the flow of fluid in a conical channel, and its position change is proportional to the flow rate. Turbine flowmeter: Using the angular momentum theorem, the fluid flow rate is determined by measuring the rotational speed of the turbine blades. The turbine rotates at high speed under the propulsion of fluid, and the rotational speed is proportional to the flow rate. Vortex flowmeter: Using the principle of fluid oscillation, the vortex frequency collision rate generated by the fluid is detected to calculate the flow front volume. When a fluid flows through a vortex ge

Secondly, according to the principle of flow meter structure, volumetric flow meters use fixed volume containers to repeatedly measure t

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