In the application of ultrasonic flowmeters, attention should be paid to the following issues

Jiangsu Shunyi Instrument Engineer reports: In the application of ultrasonic flowmeters, it is necessary to pay attention to the following issues:

1 correct choice
This is the basis for the normal operation of ultrasonic flowmeters. If the type is not properly selected, it may cause the traffic to be unable to be measured, or the user may not use it and wait for the consequences. Specific selection principles have been introduced in detail before.
.2 Reasonable installation
Unreasonable installation of the transducer is the main reason why the ultrasonic flowmeter cannot work normally. The installation of the transducer requires consideration of both the determination of the location and the choice of way. In addition to ensuring adequate upstream and downstream straight pipe sections when determining the location, special attention should be paid to the fact that the transducers try to avoid pollution power sources such as frequency converters and electric welders. In terms of installation methods, there are mainly three methods for attaching and affixing the V and Z modes, as shown in Figure 3. The Doppler type ultrasonic flowmeter adopts the installation method of sticking, and the time difference ultrasonic flowmeter adopts the V method and the Z method. Under normal circumstances, when the pipe diameter is less than 300mm, it is installed in the V manner. When the pipe diameter is greater than 200mm, the Z method is adopted. installation. For transducers that can be mounted in V mode and can be installed in the same way, use the Z mode as much as possible. Practice shows that Z-mode installed transducers have high ultrasonic signal strength and good measurement stability.
.3 Timely nuclear school
For users who have installed a large number of fixed ultrasonic flowmeters on site and have a wide range of users, a portable ultrasonic flowmeter of the same type can be equipped for use in nuclear school field instrumentation. One is to adhere to one school and one school. That is, each new ultrasonic flowmeter is to be calibrated at the time of installation and commissioning to ensure good location, good installation, and accurate measurement. Second, when sudden changes occur in the flow rate of ultrasonic flowmeters that are running online, Use a portable ultrasonic flow meter to perform a timely nuclear audit, find out the cause of sudden changes in flow, and find out whether the instrument has failed or if the flow does change.
4 Regular maintenance
Compared with other flow meters, the maintenance of ultrasonic flow meters is relatively small. For ultrasonic transducer with external transducer, Jiangsu Shunyi reported no water pressure loss after installation, no potential leakage, only need to periodically check if the transducer is loose, and the adhesive between the pipeline is good; Ultrasonic flowmeters are required to periodically clean impurities, scales, etc. on the probes for leaks. If it is an integrated ultrasonic flowmeter, check whether the flange link between the flowmeter and the pipeline is good, and consider the on-site temperature and humidity. The impact of its electronic components, waiting. Regular maintenance can ensure long-term stable operation of ultrasonic flowmeters.