Electromagnetic flowmeter output signal shaking big how to solve? On-site problem performance: Under normal and stable flow of the measured liquid in the sensor, the signal output of the instrument fluctuates greatly. Caused by the following reasons.
1. Influence of external power and magnetic interference on signal converters. There are various types of interference sources, including power supply interference (50hz power frequency interference), electromagnetic interference caused by motor motors, and common mode interference superimposed on signals. From the point of view of interference to the incoming signal converter, the main power circuit and signal circuit are the main ones. Converters generally return to normal when the source of interference disappears. 2. Influence of external interference on sensor electrodes. When there is stray current in the sensor, ionosphere is attached to the electrode, or there is a large number of interference signals on the signal line due to the problem of on-site grounding, the signal processing circuit will not be able to obtain the actual noise. signal. When the liquid is a slurry containing more particles, the particles in the liquid to be measured will scour the electrode. A large number of interference signals will appear in the signal, and the signal processing circuit will also not be able to obtain the actual signal from the noise. 3. The sensor is not full of tube state or liquid Bubbles are contained in the electrode. If an electrode is not in contact with the liquid to be measured for the above reasons, the signal on the electrode will be a messy signal.
Electromagnetic flowmeters have high measurement accuracy. There is no blockage in the measuring pipe, so there is no additional pressure loss; although the reliability of the electromagnetic flowmeter is better, it will not be damaged under normal circumstances, but due to its principle, the sensor electrode surface has been in contact with the liquid for a long time, the electrode surface It is more susceptible to contamination. Therefore, in the general case of electromagnetic flowmeters, under the condition that the customer is disassembled, it is recommended to remove and clean the primary electrode from year to year and a half to ensure the measurement accuracy of the flowmeter.
The problems that arise in the commissioning phase of common problems in electromagnetic flowmeters are generally caused by problems with installation or selection problems. Problems that occur during normal operation are generally caused by problems such as changes in operating conditions or new sources of interference. of. Therefore, problems during normal operation can generally be attributed to the instrument's ability to resist interference.
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