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How to verify the performance of a magnetic flow meter?
Published Time:
2021-07-26 14:37
Source:
Electromagnetic flow meters are commonly used instruments for measuring flow rate, particularly for liquids. Many users want to test the performance of their electromagnetic flow meters during selection and use. So how do you test the performance of an electromagnetic flow meter? Today, Ailita Instruments will provide a detailed explanation.
1. When testing the performance of an electromagnetic flow meter, we can check the insulation resistance of each core wire of the signal cable and excitation cable, and check whether the shielding layer is intact. Simultaneously, a calibration instrument can be used to test the output current of the converter. When zero flow is given, the output current should be the specified value; when a percentage of flow is given, the output current should also be the specified value, and the output current error should be within a reasonable range.
2. When testing the excitation current value of the electromagnetic flow meter, ensure that the positive and negative values of the excitation current are within the specified range. It is also necessary to assess the impact of the external environment on the electromagnetic flow meter, such as the presence of large transformers, motors, whether the excitation wire and signal wire run parallel to high-voltage cables; whether the excitation wire and signal wire are laid in the same pipeline, etc. This assessment method mainly uses visual inspection. Observe whether the running electromagnetic flow meter experiences sudden changes or fluctuations, which can help determine whether the electromagnetic flow meter is affected by electromagnetic waves or other stray waves. It can also check for the presence of bubbles in the pipeline. For verification of the electromagnetic flow meter itself, tools such as multimeters and megohmmeters are needed.
The above introduces the performance testing of electromagnetic flow meters. When checking the accuracy or performance of an electromagnetic flow meter, you can use the above methods to determine the quality of the equipment. If needed, please consult Ailita Instruments.
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