Electromagnetic flowmeters have relatively high stability, and generally have few faults. However, due to changes in environmental conditions or installation conditions, some problems or malfunctions may occur, which should be solved or avoided. The main symptoms are as follows: :
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1. The flow rate of the measured water is too low, which affects the accuracy of the measurement. In particular, electromagnetic flowmeters installed at some regional boundaries have a low pressure drop due to the small pressure difference at the end of the regional company's pipe network. The solution is to open the valves on both sides of the boundary as much as possible.
2. The installation conditions of the flowmeter are not met. The electromagnetic flowmeter has high requirements for the straight pipe section of the pipeline. It can be satisfied as much as possible in the design of the new water plant. For the renovation or installation of the old water plant, the above conditions become almost harsh. This affects the measurement stability. The solution is to add a rectifier to improve flow characteristics.
3. The surface of the sensor electrode of the electromagnetic flowmeter installed in the raw water pipeline is contaminated by sludge deposits, which affects the measurement. The solution is to use an automatic cleaning electrode and perform regular maintenance cleaning.
4. There is gas in the pipeline water, which causes the measurement fluctuation of the electromagnetic flowmeter to have great influence on stability. The solution is to find a source of gas and solve it, and if necessary, install an exhaust valve in the pipeline.
5. The foreign matter accumulates in the inlet pipe of the electromagnetic flowmeter, causing a sudden change in the flow characteristics of the measured water body, thereby affecting the measurement accuracy and causing a large error. The solution is to remove foreign matter accumulated in the pipeline in time.
6. The lightning strike caused the converter of the electromagnetic flowmeter to be damaged, so that it could not be measured. The solution is to install a corresponding lightning arrester at the input end of the converter signal, the input end of the excitation current and the working power supply end. 
Electromagnetic flowmeters are common faults in after-sales service
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