About ultrasonic flowmeter installation common problems and solutions
What are the common failures caused by improper installation of ultrasonic flowmeter? Today, flowmeter manufacturer Aister meter collected the fault performance and treatment methods, and it can be collected if necessary.
1, ultrasonic flowmeter probe used for a period of time, there will be irregular alarm. Especially when there are more impurities in the conveying medium, this problem will be more common.
Solution: Clean the probe regularly (cleaning once a year is recommended).
2. When the ultrasonic flowmeter 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
3, ultrasonic flowmeter on the pipeline requirements are very strict can not have abnormal sound, otherwise it will affect the measurement error is very large
During the propagation of ultrasonic waves, due to the obstruction or absorption of the media and impurities in the media, its intensity 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.
4, instantaneous flow fluctuation?
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 own fluid fluctuation, the position is not good, re-select the point, to ensure the first 10D after 5D working conditions.
5, the external clamp type ultrasonic flowmeter signal is low?
This depends on the technical content of the instrument itself, which has been proved by a large number of test examples on the spot, such as long pipeline time, serious scaling, large pipe diameter problems, external clamped ultrasonic flowmeter, the signal is very fast, and the signal is very stable.
Solution: For the large diameter of the pipe, serious scaling, it is recommended to choose a good quality external clamp ultrasonic flowmeter, the pipe at the installation of the probe should be polished clean, and the air between the probe and the surface of the workpiece should be eliminated with coupling agent or coupling piece, so that the ultrasonic wave can be effectively transmitted into the pipeline to ensure that the detection surface has enough sound intensity transmission.
6, occasionally there are bubbles in the measuring medium, is it affected by the ultrasonic flowmeter with the time difference method?
The external clamp ultrasonic flowmeter has two modes, when there are bubbles, it can be automatically transferred to Doppler mode to measure, and when the bubbles disappear, it will be automatically transferred to the time difference method.
7, the instrument can not be used under strong interference in the field?
There is field strong electromagnetic interference of frequency converter or high voltage cable
Suggestion: Keep away from the frequency converter or high-voltage cable field strong electromagnetic interference
8. How much can the minimum diameter of the external clamp ultrasonic flowmeter on the market be measured? What’s the maximum temperature?
Answer: The minimum pipe diameter can be measured to 6mm, and the temperature can be measured to 550℃, such as the measurement of molten salt and thermal oil, which is not possible for other brands of flowmeters.
9, how to choose a suitable ultrasonic flowmeter?
Answer: Pipe material, pipe wall thickness and pipe diameter; Fluid type, whether it contains impurities, bubbles, and whether the tube is full; Fluid temperature, type of flow meter, whether portable or stationary online.
