Analysis of Common Faults of Ultrasonic Flowmeter

1. Transient flow abnormalities Transient flow abnormalities may be caused by temperature and voltage changes, communication cables, surge protectors, flow computers and other failures, which need to be carefully checked and confirmed. Through the communication line exchange with the temperature and voltage changes of other flowmeters, it can be judged that it is a flow computer problem or a field line or instrument problem. The following examples of A and B ultrasonic flowmeters show that A is normal and B is abnormal. 1) Fault judgment of instruments and circuits After switching the communication lines of A and B with temperature and voltage changes, the display of B is normal and the display of A is abnormal, so it can be judged that there is a problem with the temperature and pressure communication line or instrument of A. Both temperature and voltage changes support HART communication protocol. The following methods can be used to judge: disconnect the power supply of the secondary instrument, use FLUK to supply power, and check the secondary instrument, if no or abnormal data is detected, determine whether the instrument is faulty, and replace the instrument to restore normal life. Production. If the value of the instrument can be detected and the display is normal, the 24V power supply of the field instrument can be restored. If the communication cable of the flow computer cannot be detected in one section, it can be judged that the cable is damaged. If the signal is abnormal after passing through the surge protector, it can be judged that the fault of the surge protector has been replaced, and the surge protector has been replaced. The device resumes normal data transfer. 2) After the Hart board of the flow computer fails to switch the communication lines of A and B, A displays normal and B displays abnormal, indicating that the flow computer of B is faulty. Check the status of the flow computer's Hart board LED, which is normally blinking green. If other states are displayed, such as red is always on or off, the corresponding channel of the Hart board will be damaged. There are two solutions: one is to directly replace the Hart board without refreshing the configuration; the second is to change the refresh configuration, requiring the technical engineer to change the configuration, changing the channel of the temperature change and the pressure change corresponding to the Hart board. Generally speaking, in thunderstorm weather in summer, the flow computer is easily damaged by lightning, especially the Hart plate, which is more likely to be damaged and requires special attention.

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