Price of open channel Doppler flowmeter | Issues with open channel flowmeter

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1. Introduction to Types and Principles of Liquid Flow Meters

Liquid flow meters can be divided into flow meters used in pipelines and flow meters used in open channels according to their usage scenarios. The specific types and principles are as follows:

1. Flow meters used in pipelines - Vortex street flow meters. Principle: A cylindrical object is vertically inserted into the measuring tube, and regular vortices (Karman vortex street) are alternately generated on both sides of the cylindrical object when the fluid passes through. The release frequency of Karman vortex street is related to fluid velocity and column width. Place a pressure sensor at the vortex at the rear end of the cylindrical object, measure the frequency of pressure changes, calculate the liquid flow rate, and then combine it with the pipe cross-sectional area to obtain the pipeline flow rate. Advantages: No movable parts, simple measuring element structure, reliable performance, long service life, high accuracy. Disadvantages: Poor adaptability to measuring dirty media, high requirements for straight pipe sections, and poor anti vibration performance. Principle of turbine flowmeter: It belongs to the velocity flowmeter, which uses gas to drive the impeller of the flowmeter to rotate. The rotation speed of the impeller is proportional to the volume flow rate of the fluid. According to the principle of electromagnetic induction, a magnetic sensor is used to sense a pulse signal proportional to the volume flow rate of the fluid from the synchronously rotating impeller. After calculation and processing, the liquid flow rate is obtained, and then the pipeline flow rate is calculated based on the cross-sectional area of the pipe. Advantage

s: Compact and lightweight structure, easy installation and maintenance, and high circulation capacity. Disadvantages: Unable to maintain accuracy for a long time, requires high cleanliness and tidiness of the medium, and is not suitable for places with rapid changes in flow rate and velocity. Principle of electromagnetic flowmeter: According to Faradays law of electromagnetic induction, when a conductor moves in a magnetic field to cut magnetic field lines, an induced electric potential e is generated at both ends of the conductor, and its direction is determined by the right-hand rule. The magnitude is proportional to the magnetic induction intensity B of the magnetic field, the length L of the conductor in the magnetic field, and the movement speed u of the conductor. When B and L are constant, the liquid flow velocity can be calculated based on the electric potential e, and the pipe flow rate can be calculated by combining the pipe cross-sectional area. Advantages: The transmitter has a simple structure, no mechanical inertia, sensitive response, can measure instantaneous pulsating flow, and good linearity. Disadvantages: susceptible to external electromagnetic interference; Cannot measure liquid media with very low conductivity (the conductivity of the tested liquid medium cannot be lower than 10-5 (S/cm), equivalent to the conductivity of distilled water), and is powerless for petroleum products or organic solvents.

2. Principle of Doppler Ultrasonic Flow Meter Used in Open Channels: Using the physical principle of Doppler frequency shift to measure the flow velocity of silver, and then calculating the water flow rate by measuring the water depth sensor and inputting information such as the width of the rive

Price of open channel Doppler flowmeter | Issues with open channel flowmeter

1. Introduction to Types and Principles of Liquid Flow Meters

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