Ultrasonic flowmeter principle and advantages

Project Overview

Ultrasonic flowmeter is a flowmeter developed based on the principle that the propagation speed of ultrasonic waves in flowing media is equal to the vector sum of the average flow speed of the measured medium and the speed of sound waves in stationary media.

1. Working principle

When the ultrasonic beam propagates in the liquid, the flow of the liquid will cause slight changes in the propagation time, and the change in the propagation time is proportional to the flow rate of the liquid. At zero flow, the time required for the two sensors to emit and receive sound waves is exactly the same (the only technology that can actually measure zero flow); when the medium flows, the sound wave transmission time in the countercurrent direction is greater than the sound wave transmission time in the downstream direction. The relationship is consistent with the following expression.

2. Product Overview

Qingdao Hesheng Measurement and Control HSC series ultrasonic flowmeter itself has a heat accumulation function, plus a pair of platinum resistors, and adopts the international standard enthalpy value heat calculation formula ( Enthalpy difference method) can realize the measurement of cold/heat. In order to meet the on-site needs of users in different working conditions, this series of products is divided into integrated, split modular and battery-powered types. It is suitable for cold/heat measurement of air conditioners. And heat measurement of unit buildings, heat exchange stations and heating company pipe networks.

3. Application Scenarios

Ultrasonic flowmeters are widely used in many fields, including but not limited to:

1. Sewage treatment plants: used It is used to monitor flow changes in sewage treatment plants and help staff understand the efficiency of sewage treatment and the improvement of water quality.

2. Drainage pipe network: Monitor the flow and velocity of sewage in the pipes in the drainage pipe network, and detect leakage and blockage of the pipes.

3. Pipes full of clean water and light sewage: Provide accurate measurement results when the pipes are full of clean water or light sewage.

4. Rivers/Channels: Used to monitor the flow and velocity of water, which is of great significance for the dispatch and management of water resources.

5. Industrial production: Monitor the flow and temperature of cooling water in the cooling system to optimize the production process, reduce production costs and improve production efficiency.

IV. Advantages

1. It is not affected by changes in fluid density, viscosity, temperature, pressure and conductivity. The linear measurement principle can achieve high-precision measurement.

2. There are no flow obstructions and moving parts in the measuring tube, and there is no pressure loss, so it will not cause additional energy loss or blockage.

3. The instrument diameter covers the range from DN20 to 5000, which can meet the flow measurement requirements of a variety of liquids.

4. Full digital processing, fast calculation speed, strong anti-interference ability, reliable measurement, high accuracy, and the measurable range can reach 1:150.

5. It can be used to measure fluid flow and large pipe diameter flow that are difficult to access and observe.

6. It can measure the flow of highly corrosive media and non-conductive media.

7. Various installation forms, you can choose pipe segment type, plug-in type, external clamp type, hand-held type and portable type.

8. Easy to install, external clip-on and portable installationSimple, save time and effort.

9. The function is more complete, and the matching temperature sensor can measure the cold and heat of the medium.

10. It has pulse, 4-20mA, 485Modbus-rtu communication, Hart protocol and other remote signal outputs.

11. High-definition backlit LCD display, full Chinese character menu operation, easy to use, simple to operate, easy to learn and understand.

12. There are many product series, suitable for different users and different working conditions.

Ultrasonic flowmeter has broad application prospects and significant technical advantages. It is an important flow measurement instrument. The ultrasonic flowmeter can be clamped on the surface of the measuring pipe and does not contact the fluid, so it does not interfere with the flow field and has no pressure loss. It is an ideal energy-saving instrument.