Ultrasonic waves carry information on the flow rate of the fluid when it travels in a flowing fluid. Therefore, the flow velocity of the fluid can be detected by the received ultrasonic wave and converted to flow. According to the detection method, it can be divided into different types of ultrasonic flowmeters such as the differential propagation velocity method, Doppler method, beam offset method, noise method, and correlation method. Ultrasonic flowmeter is a kind of application that began to be applied in the last decade with the rapid development of integrated circuit technology.
Non-contact meter for measuring fluids that are not easily accessible and observable, as well as large pipe flow. It works in conjunction with a water gauge to measure open flow. The use of ultrasonic flow ratio does not change the flow state of the fluid without installing a measuring element in the fluid, and no additional resistance is generated. The installation and overhauling of the instrument does not affect the operation of the production line and is thus an ideal energy-efficient flow meter.
As we all know, industrial flow measurement has the problem of large diameter and large flow measurement difficulties. This is because general flowmeters have difficulties in manufacturing and transportation as the diameter of the measurement increases, and the cost increases and the energy loss increases. Installation not only has these drawbacks, but ultrasonic flowmeters can be avoided. Because all types of ultrasonic flowmeters can be installed outside the pipe, non-contact flow measurement, the instrument cost is basically irrelevant to the size of the measured pipe diameter, while other types of flowmeters increase with the diameter, the cost increases significantly, so the larger the caliber ultrasonic The flowmeter has a superior function to price ratio over other types of flowmeters with the same function. Considered to be a good large-diameter flow measuring instrument, the Doppler ultrasonic flowmeter can measure the flow of the two-phase medium, so it can be used for the measurement of dirty streams such as sewers and sewage. In power plants, the use of a portable ultrasonic flow meter to measure the flow rate of large turbines, such as turbine inlet and turbine circulating water, is much more convenient than the past. Ultrasonic flow juice can also be used for gas measurements. The applicable range of the pipe diameter is from 2cm to 5m. It can be applied from several meters wide open channel, underdrain to 500m wide river.
In addition, the flow measurement accuracy of the ultrasonic measuring instrument is almost unaffected by the parameters such as temperature, pressure, viscosity, and density of the measured fluid, and it can be made into a non-contact and portable measuring instrument, so it can solve the problem that other types of instruments are difficult to measure. Corrosive, non-conductive, radioactive and flammable and explosive media flow measurement problems. In addition, due to the non-contact measurement characteristics, coupled with a reasonable electronic circuit, a single meter can adapt to a variety of pipe diameter measurements and multiple flow range measurements. Ultrasonic flow meter adaptability is also unmatched by other instruments. Ultrasonic flowmeter has some advantages mentioned above. Therefore, it has received more and more attention and developed into a series of products. It has been developed into standard, high-temperature, explosion-proof, and wet type instruments with different channels to adapt to different media. Different Flow measurement of occasions and different pipeline conditions.Ultrasonic Flowmeter Usage and Frequently Asked Questions
1. Ultrasonic flowmeter probes are used for a period of time and irregular alarms occur. Especially when there are many impurities in the conveying medium, this problem will be more common. Solution: Clean the probe regularly (it is recommended to clean it once a year).
2, the ultrasonic flowmeter transport medium such as water containing liquid impurities, the flowmeter fluid joining pipe prone, will freeze and block the impulse piping temperature is low, especially in the more common northern winter. Solution: Purge the pressure tube or heat tracing
3, ultrasonic flowmeters are very strict on the requirements of the pipeline can not have abnormal sound or it will affect the measurement error is very large
During the propagation of ultrasonic waves, the intensity of the ultrasonic waves is attenuated due to the impediments or absorption of impurities in the medium and the medium. Whether it is an ultrasonic flow meter or an ultrasonic level meter, there is a certain requirement on the intensity of the received acoustic wave, so all kinds of attenuation must be suppressed.
4, instantaneous flow fluctuations?
The signal intensity is large, and the fluctuation of the fluid itself is measured.
Solution: Adjust the probe position, improve signal strength, signal strength to ensure stability, such as volatile fluid itself, the location is not good, again the choice of site, to ensure that working conditions 5D requirements before and after 10D.
5, external clip type ultrasonic flowmeter signal low?
This depends on the technical content of the instrument itself. It has been proved by a large number of test cases on the site, such as the long time of the pipeline, serious scaling, and large diameter. .
Solution: For the large diameter, serious scaling, it is recommended to use a good quality external clamp type ultrasonic flowmeter, the probe installation pipe to be polished clean, with the coupling agent or coupling piece to eliminate the air between the probe and the workpiece surface, so that ultrasound Can effectively pass into the pipeline to ensure that there is sufficient sound intensity transmittance on the detection surface.
6. Occasionally there are air bubbles in the measuring medium. Does the ultrasonic flowmeter with time difference have any effect?
This Altoel AFTU-2W series clip-on ultrasonic flowmeter has dual mode. When there is a bubble, it can be automatically transferred into the Doppler mode to measure. When the bubble disappears, it will be automatically transferred to the time difference method.
7, the instrument can not be used under the strong interference scene?
Field frequency inverter or high-voltage cable Field strength Electromagnetic interference Recommendation: Far away from the inverter or high-voltage cable Field Strong electromagnetic interference
8. What is the minimum diameter of the ultrasonic clamp on the market that can be measured and how high is the temperature?
Answer: Now the world's only Atoller AFTU-2W series can measure 6mm minimum diameter, temperature can be measured to 550 Â°C, like measuring molten salt and thermal oil such conditions, which is other brands can not do of. Electromagnetic flowmeter price
9, how to choose a suitable ultrasonic flow meter?
Answer: pipe material, diameter and wall thickness; type of fluid, whether it contains impurities, bubbles and whether full bobbin; fluid temperature, meter type, portable or fixed line.
Ultrasonic Flowmeter Usage and Precautions
1, precision function check
Accuracy grades and functions Select the instrument accuracy grade according to the measurement requirements and the use occasions, so that it is cost-effective. For applications such as trade settlement, product handover, and energy metering, higher accuracy levels, such as 1.0, 0.5, or higher, should be selected. For process control applications, different accuracy levels are selected based on control requirements; some Is to detect the process flow, do not need to do precise control and measurement occasions, you can choose to lower the accuracy level, such as 1.5, 2.5, or even 4.0, then you can use low-cost plug-in ultrasonic flowmeter.
2. Measurable medium
Measuring the flow rate of the medium, when the measurement range of the instrument with the aperture of the general media, full-scale flow ultrasonic flow meter may be selected in / s flow rate range of the measurement medium 0.5-12m, relatively wide range. The selected instrument specification (diameter) is not necessarily the same as the process piping. The measurement flow range should be determined within the flow rate range. That is, when the flow rate of the pipeline is too low to meet the requirements of the flow meter or the measurement accuracy at this flow rate is not guaranteed, It is necessary to reduce the diameter of the instrument to increase the flow rate in the tube and obtain satisfactory measurement results.
These are some of our superficial views on ultrasonic flowmeter uses the frequently asked questions, want to use for your help, if any more questions, you can contact us, we will try to provide you row worries.
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