Liquid ultrasonic flowmeter is a kind of time difference ultrasonic flowmeter, which is suitable for measuring the flow of various clean and uniform liquids. Its good man-machine interface makes the user convenient and easy to remember when setting parameters, and maintains excellent quality and high reliability.
According to the principle of signal detection ultrasonic flowmeter can be divided into propagation velocity difference method (direct time difference method, time difference method, phase difference method and frequency difference method), beam migration method, Doppler method, cross-correlation method, space filter method and noise method.
Liquid ultrasonic flowmeter and electromagnetic flowmeter, because the instrument flow channel is not set up any obstruction, are the first flowmeter, is suitable for solving the difficult problem of flow measurement of a class of flowmeter, especially in the large flow measurement has a more prominent advantage, it is one of the rapid development of a class of flowmeter.
Liquid ultrasonic flowmeters may encounter the following problems:
1. When the conveying medium contains liquid impurities such as water, the flowmeter pressure tube is easy to produce liquid accumulation, and the freezing of the pressure tube will occur when the temperature is low, especially in the winter in the northern region. Solution: Purge the pressure tube or add electric heat tracing.
2, the pipeline requirements are very strict can not have abnormal sound, otherwise it will affect the measurement error is very large. In the process of propagation, due to the obstruction or absorption of the medium and impurities in the medium, its strength will be attenuated. Whether it is an ultrasonic flowmeter or an ultrasonic level meter, there are certain requirements for the accepted acoustic wave intensity, so all kinds of attenuation should be suppressed.
3, the instantaneous flow fluctuation is large?
The signal strength is large, and the measured fluid fluctuates greatly. Solution: Adjust the probe position, improve the signal strength, to ensure that the signal strength is stable, such as its fluid fluctuation, the position is not good, re-select the point.
Post time: Aug-07-2023