Which is a good Doppler flowmeter? What is the difference between a vortex flowmeter and a Doppler ultrasonic flowmeter in open channels?

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1. Application of Dalian Measurement Ultrasonic Flow Timing Difference Method and Doppler Method

Application of Dalian Measurement Ultrasonic Flow Timing Difference Method and Doppler Method Ultrasonic flow meters are mainly divided into two types according to their working principles: time difference method and Doppler method, which are suitable for different media and places. The following is a detailed explanation of the application of the time difference method and Doppler method in measuring ultrasonic flow in Dalian:

1. Application of Time Difference Method Ultrasonic Flow Meter Time difference method Ultrasonic flow meter is mainly used for measuring clean and single cavity phase liquids. Its working principle is to calculate the flow rate by measuring the time difference between the propagation of ultrasonic waves in the upstream and downstream directions, and then obtain the flow rate. Since the TDOA ultrasonic flowmeter requires high cleanliness of the medium, it is especially suitable for the following occasions: water companies: in Rivers and Lakes, reservoirs, raw water measurement, tap water flow measurement and other occasions, the water quality is usually clean, and the TDOA ultrasonic flowmeter is suitable for use. Oilfield: In situations where single-phase clean liquids need to be measured, such as well cementing mud flow measurement, the time difference method ultrasonic flowmeter is also applicable. Chemical metallurgy: In industrial circulation water flow measurement, production process water consumption measurement and other occasions, if the medium is relatively clean, the time difference method ultrasonic flowmeter can also be considered. Measurement of other cleaning liquids: suc

2. Application of Doppler Ultrasonic Flow Meter Doppler ultrasonic flow meter is suitable for two-phase fluids with low heterogeneous content, such as untreated sewage, factory discharge liquid, dirty process liquid, etc. Its working principle is to calculate the flow velocity by measuring the frequency change of ultrasonic waves reflected by scatterers (such as suspended particles) in the fluid. The Doppler ultrasonic flowmeter has relatively high requirements for the medium, and the impurity content cannot be too low or too high to ensure the accuracy of the measurement results. Therefore, it is particularly suitable for the following situations: in the field of environmental protection: in municipal sewage measurement, factory sewage discharge detection and other occasions, due to the presence of a certain amount of suspended particles in sewage, Doppler ultrasonic flowmeter is suitable for use. Oilfield: In situations such as measuring the flow rate of oily wastewater and injection water in oilfields, if the medium contains a certain amount of heterogeneous components, the Doppler ultrasonic flowmeter is also applicable. Measurement of other fluids containing different phases: such as measurement of certain dirty process fluids in chemical metallurgy, measurement of certain fluids containing particles in food and pharmaceutical enterprises, etc.

III. Precautions for Selection of Ultrasonic Flowmeters When selecting an ultrasonic flowmeter, in addition to considering the working princip

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