The design principle and characteristic of ultrasonic flowmeter

Ultrasonic flowmeter is designed based on the principle that the velocity of ultrasonic propagation in the flowing medium is equal to the average velocity of the measured medium and the geometric sum of the velocity of the sound wave itself. When propagating in the flowing fluid, it carries the information of the flow velocity, and the flow rate is reflected by measuring the flow velocity. Although the ultrasonic flowmeter appeared in the 1970s, it is very popular because it can be made into non-contact type, and can be linked with the ultrasonic water level meter for open flow measurement, and does not produce disturbance and resistance to the fluid.

Ultrasonic flowmeter can be divided into time difference type and Doppler type according to the principle of measurement.

Time difference ultrasonic flowmeter made by the principle of time difference has been widely concerned and used in recent years. It is the most used ultrasonic flowmeter in enterprises and institutions.

The ultrasonic Doppler flowmeter made of Doppler effect is mainly used for measuring medium with certain suspended particles or bubble media, and has certain limitations in use, but it solves the problem that the time difference ultrasonic flowmeter can only measure single clear fluid, and is also considered as the ideal instrument for non-contact measurement of two-phase flow.

Advantages:

Ultrasonic flowmeter is a kind of non-contact measuring instrument, which can be used to measure the fluid flow and large pipe runoff which are not easy to contact and observe. It does not change the flow state of the fluid, does not produce pressure loss, and easy to install, instrument installation and maintenance will not affect the production line operation, so it is an ideal energy saving flowmeter.

(1) It can be linked with the water level gauge to measure the flow of open water flow.

(2) Can measure the flow rate of strong corrosive media and non-conductive media.

(3) The ultrasonic flowmeter has a large measuring range, and the pipe diameter ranges from 20mm to 5m.

(4) Ultrasonic flowmeter can measure all kinds of liquid and sewage flow.

(5) The volume flow measured by ultrasonic flowmeter is not affected by thermal physical parameters such as temperature, pressure, viscosity and density of the measured flow body. It can be made in both stationary and portable forms.