Description
Ultrasonic flowmeter is an instrument that uses the characteristics of ultrasonic wave propagation in fluid to measure flow. It has many measurement methods, among which the time difference method and Doppler method are more widely used. Today we mainly talk about the time difference method.
The time difference method measures the time difference caused by the different propagation speeds during forward and reverse propagation to calculate the velocity of the measured fluid. Specifically, two sound wave transmitters and two sound wave receivers are used, and two groups of sound waves from the same sound source are transmitted in different paths. In a non-flowing state, the propagation time of the ultrasonic wave is constant, but when the fluid flows, the propagation time changes. Based on the sound speed and the propagation time difference, the flow rate of the fluid can be calculated, and then the flow rate of the fluid can be calculated by measuring the cross-sectional area of the pipe. For example, when measuring the flow rate of pure liquids with relatively few impurities such as tap water, river and sea water, the time difference method has higher accuracy.
In general, ultrasonic flow meters have the advantages of non-contact measurement, high metering accuracy, strong adaptability to pipe diameter, and easy digital management. They are widely used in industrial production, commercial metering, and water conservancy testing.
Advantages
1. Non-contact measurement
Ultrasonic flowmeters are well-known for their non-contact measurement technology. Unlike traditional measurement methods that require direct contact with the fluid, it measures the flow rate of the fluid through the propagation speed of ultrasound, without cutting the pipe and without contaminating the pipe medium. This feature allows ultrasonic flowmeters to avoid direct contact with the fluid, thereby greatly reducing the impact on the fluid properties.
2. Low maintenance cost
Ultrasonic flowmeters have no wear and no moving parts, which are not easily affected by the medium and can maintain long-term accuracy. This greatly extends the service life of the equipment and reduces maintenance costs
3. Widely application
Ultrasonic flow meter can be applied to a wide range of pipe flow measurements. Applicable liquids include pure liquids as well as liquid with small quantity of tiny particles. Water (hot water, chilled water, city water, sea water, waste water, etc.);
Application case
In power plants, ultrasonic flowmeters are indispensable for measuring water consumption in the production process, cooling circulation water flow, and generator coil cooling water flow. It can monitor water flow in real time, ensure the safe operation of the generator set, and improve power generation efficiency.
In the metallurgical industry, ultrasonic flowmeters are indispensable for measuring industrial circulating water flow, water consumption in production processes, and ore dressing slurry flow. According to statistics, in some large metallurgical enterprises, the application of ultrasonic flowmeters can reduce water consumption in production processes by about 10%, greatly improving the utilization efficiency of water resources, and also helping to optimize ore dressing processes and improve the quality and output of mineral products.
In the pharmaceutical industry, high-precision flow measurement equipment is required for chemical drug flow measurement and water consumption measurement in the production process. Ultrasonic flow meters, with their high-precision and non-contact measurement characteristics, can meet the pharmaceutical industry's strict requirements for flow measurement and ensure the quality of drugs and the safety of the production process.
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