Ultrasound will be scattered if it encounters tiny solid particles or bubbles in the propagation path, because the time difference method does not work well when measuring fluids containing such things. It can only be used to measure clean fluids. The Doppler method is based on the fact that ultrasonic waves are scattered, so the Doppler method is suitable for measuring fluids containing solid particles or bubbles. However, because scattered particles or bubbles exist randomly, the sound transmission performance of the fluid is also different. . If it is a fluid with poor sound transmission performance, the scattering is stronger in the low-velocity area near the pipe wall; while the fluid with good sound transmission performance is scattered in the high-velocity area, which makes the Doppler method more accurate. low. Although the transmitting transducer and the receiving transducer are separated, so that only the scattering in the middle area of the flow velocity profile can be received, the measurement accuracy is still lower than that of the time difference method.
●Product features of Doppler ultrasonic flowmeter:
●Dual-line 16-bit LCD display
●Measurement accuracy 1%
●Protection grade IP66, 2Mb memory
●Battery powered or external power supply
●Output: 4~20mA, RS232/485
●Output: SDI-12, wireless communication
Doppler ultrasonic flowmeter is widely used in industry, water conservancy, irrigation and other industries, suitable for flow measurement of full pipe, partial pipe, open channel, etc.