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Instructions for using ultrasonic flowmeters

Ultrasonic flowmeter is a non-contact meter that can measure the flow rate of large diameter media or the measurement of medium that is difficult to contact and observe. It has the advantage that other flowmeters cannot be compared. However, when using it, the user often ignores some problems, resulting in inaccurate measurement results, and the user is not satisfied with the measurement results. The following describes the issues to be aware of when using an ultrasonic flowmeter.

First, to properly calibrate and calibrate the ultrasonic flowmeter

Any flow meter needs to be calibrated and calibrated before use. Portable ultrasonic flow meters are very important at this point. As we all know, the probe of the flowmeter is suitable for different diameters. The combination of each probe and the host is a set of independent flowmeters in a sense.

If the portable ultrasonic flowmeter is calibrated and calibrated with a small probe on a small-diameter flow standard device, then using a large probe to measure the flow of a large pipe during use is equivalent to using uncalibrated and calibrated flow. The measurement accuracy is not guaranteed.

The correct method should be: based on your own use as a reference, try to verify and calibrate multiple pipelines on the portable ultrasonic flowmeter on a flow standard device with the same and close diameter. At a minimum, ensure that each set of probes configured for the flowmeter is calibrated. The portable ultrasonic flow meter is equipped with multiple sets of probes for different calibers and may have several instrument correction factors. Therefore, it is necessary to ensure that the instrument correction factor is correct when using it.

Second, pay attention to the requirements of the ultrasonic flowmeter on the use conditions and the use environment

Any speed flow meter has certain requirements on the flow field of the fluid in the pipe under test. When the installation position of the ultrasonic flowmeter cannot guarantee the length of the straight pipe section before and after, the flow field instability will bring certain measurement errors. Many users are limited by the metering wells and are measured at locations that do not meet the installation requirements, resulting in increased measurement errors.

The time difference type ultrasonic flowmeter is particularly sensitive to the bubbles mixed in the water, and the bubbles flowing therewith will cause the flowmeter to be unstable. If the accumulated gas is exactly matched with the installation position of the probe, the flowmeter will not work. Therefore, the installation of the ultrasonic flowmeter should avoid the position of the pump outlet, the highest point of the pipeline, etc., which is susceptible to gas. The installation point of the probe should also avoid the upper and bottom of the pipeline as much as possible, and install it within a range of 45° from the horizontal diameter. Also pay attention to avoiding pipeline defects such as welds.

Third, accurate measurement of pipeline parameters

Ultrasonic flowmeter is an excellent flow meter with the advantages of stable measurement signal, strong anti-interference ability and accurate measurement. However, if the user's parameter measurement of the pipeline is inaccurate during use, accurate measurement is even more difficult. Ultrasonic flowmeter is an ideal flowmeter. Users often misunderstand it due to improper use. After reading this article, users are expected to use ultrasonic flowmeter correctly to achieve good measurement results.

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