Selection and Application of Ultrasonic Flowmeter

In the application of ultrasonic flowmeter, the following aspects need to be paid attention to: 1. Correct selection The correct selection of ultrasonic flowmeter is the basis for the flowmeter to work normally. Improper selection may cause the flow to be unable to be measured, and the user will not use it properly and other consequences. 2. Reasonable installation The unreasonable installation of the transducer is the main reason for the failure of the ultrasonic flowmeter to work normally. The installation of transducers needs to consider two issues of location determination and method selection. When determining the position, in addition to ensuring sufficient upstream and downstream straight pipe sections, special attention should be paid to the transducer as far as possible to avoid places with polluting power sources such as frequency conversion speed regulators and electric welding machines. In terms of installation methods, there are mainly three types: face-to-face installation, V method, and Z method, as shown in Figure 3. The Doppler ultrasonic flowmeter adopts the face-to-face installation method, and the transit-time ultrasonic flowmeter adopts the V method and the Z method. Generally, when the pipe diameter is less than 300mm, the V method is used for installation, and when the pipe diameter is greater than 200mm, the Z method is used. Install. That is to say, the transducer can be installed in the V mode or in the vertical mode, and the Z mode should be used as much as possible. Practice has shown that the transducer installed in the Z mode has high ultrasonic signal strength and good measurement stability. 3. Timely calibration. Users who install a large number of fixed ultrasonic flowmeters on site and have a wide range of users can be equipped with a portable ultrasonic flowmeter of the same type for checking and calibrating the conditions of the on-site instruments. One is to insist on one installation and one calibration, that is, to check and calibrate each newly installed ultrasonic flowmeter during installation and commissioning to ensure that the location is selected, installed, and measured accurately; The portable ultrasonic flowmeter is checked in time to find out the cause of the sudden change in the flow rate, and to find out that the flow rate has indeed changed due to the failure of the instrument. 4. Regular maintenance Compared with other flowmeters, the maintenance amount of ultrasonic flowmeter is relatively small. Ultrasonic flowmeters with external transducers have no water pressure loss and no water leakage after installation. You only need to regularly check whether the transducers are loose and whether the adhesive between them and the pipeline is good; Clean up impurities, scale, etc. on the probe for water leakage; it is an integrated ultrasonic flowmeter, check whether the flange connection between the flowmeter and the pipeline is good, and consider the impact of on-site temperature and humidity on its electronic components, wait. Regular maintenance can ensure the long-term stable operation of the ultrasonic flowmeter.

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