Ultrasonic sewage flowmeter | Doppler ultrasonic flowmeter flow measurement principle

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1. Selection reference: Detailed explanation of advantages and disadvantages of ultrasonic flowmeter

Ultrasonic flowmeter achieves non-invasive flow measurement through the propagation characteristics of ultrasonic waves, which has the advantages of non-contact measurement, stable accuracy, and easy installation. However, it also has limitations such as medium adaptability, environmental interference, and low-temperature working conditions.

1. The advantages of ultrasonic flowmeter are non-contact measurement and strong adaptability. The sensor is installed outside the pipeline and does not need to be in direct contact with the medium. It can measure corrosive, high viscosity or special media containing impurities (such as acid-base solutions, mud, etc.).

. This design avoids the wear and contamination of instruments by the medium, extends the service life of equipment, and is particularly suitable for scenarios such as chemical and metallurgical industries that require high corrosion resistance of instruments. Figure: Schematic diagram of the relationship between the propagation time and flow velocity of ultrasonic waves in a fluid flow system. The measurement accuracy is stable, the maintenance cost is low, and there are no mechanical moving parts (such as turbines, pistons, etc.), reducing the probability of equipment failure and eliminating the need for frequent maintenance in daily life. Regular calibration is sufficient to ensure measurement accuracy, and the long-term cost is significantly lower than that of mechanical flow meters, making it suitable for industrial scenarios that require continuous and stable operation. Easy to install, with minimal impact on pipelines. When installing, there Ultrasonic sewage flowmeter

is no need to cut off the pipeline or stop production. Deployment can be completed through external clamp or plug-in wear wheel sensors, especially suitable for upgrading and renovating flow monitoring of already put into operation pipelines. For example, installing ultrasonic flow meters in oil pipelines can achieve flow measurement without stopping the pipeline. Secondly, the disadvantages of ultrasonic flow meters are limited by the characteristics of the medium containing bubbles/particles: ultrasonic signals are easily attenuated by a large number of bubbles or suspended particles, resulting in distorted measurement data. For example, in the outlet pipeline of the aeration tank in a sewage treatment plant, ultrasonic flow meters may not be able to accurately measure. Gas measurement: It requires extremely high stability of medium temperature and pressure, and temperature fluctuations or pressure changes can significantly affect sound velocity, thereby reducing measurement accuracy. The installation environment requires strict conditions for the inner wall of the pipeline. Scaling, rust, or rough inner walls can interfere with ultrasonic signal transmission, and regular cleaning of the pipeline or selection of pipes with smooth inner walls is necessary. Electromagnetic interference: When there is a strong electromagnetic field near the pipeline (such as high-voltage cables, frequency converters), additional shielding measures (such as installing metal sheaths) need to be taken to avoid signal interference. The adaptability to low temperature conditions is weak. In extreme low temperature environments (below -40 ℃), the ultrasonic emission efficiency of the sensor will decrease, resulting in a reduction in measurement

Ultrasonic sewage flowmeter | Doppler ultrasonic flowmeter flow measurement principle

1. Selection reference: Detailed explanation of advantages and disadvantages of ultrasonic flowmeter

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