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(1) Electromagnetic flowmeters have certain requirements regarding the pipes used; there are high demands on the straight sections of these pipes. These requirements can be met as much as possible during the design of new water treatment plants. However, when upgrading or installing such devices in existing water treatment plants, it becomes more difficult to meet these conditions, which can affect the stability of the equipment. A solution to this issue is to install straightening tubes to improve the flow characteristics. (2) Secondly, if the flow rate of the water being measured is too low, it will also affect the accuracy of the measurement. (3) Thirdly, the presence of gas in the pipeline can cause fluctuations and instability in measurements. To address this issue, it is necessary to identify the source of the gas and take action to eliminate it; if needed, an exhaust valve can be installed in the pipeline. (4) The sensor electrodes of the flow meter installed in the raw water pipeline are contaminated by sediment deposition, affecting the measurements. The solution is to use a scraper-type electrode and to perform regular maintenance and cleaning of the well. (5) The accumulation of foreign objects in the inlet pipeline of the electromagnetic flowmeter can also affect measurement accuracy. The solution is to promptly remove the debris accumulated in the pipes. (6) Lightning strikes cause damage to the converter of the electromagnetic flowmeter, rendering it unable to perform measurements. The solution is to install corresponding lightning arresters at the converter signal input, the excitation current input, and the power supply terminal respectively.