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What are the methods for verifying the accuracy of a magnetic flow meter?
Published Time:
2021-03-23 23:04
Source:
Electromagnetic flow meters are commonly used instruments for measuring flow rate. They are frequently used in flow rate measurement, and users typically need to understand how to check their accuracy. So, how do you check the accuracy of an electromagnetic flow meter? Today, eletta will provide a detailed explanation.
Because electromagnetic flow meters are used continuously and are generally not removed for calibration, accuracy checks are usually performed on-site. Verifying the accuracy of an electromagnetic flow meter is very beneficial for its management and ensuring accuracy. Current methods for checking the accuracy of electromagnetic flow meters are visual inspection and instrumentation methods. These methods use specialized tools to check items such as the excitation coil resistance, insulation resistance between signal lines, and ground resistance of the sensor, to see if they meet the manufacturer's requirements. The specific testing methods are:
1. Measure the resistance of the excitation coil. Check for any inter-turn short circuits in the excitation coil. The resistance value should be between 30-170 ohms. If the resistance matches the factory record, the coil is considered good, indirectly indicating that the magnetic field strength of the electromagnetic flow meter sensor has not changed.
2. Measure the insulation resistance of the excitation coil to ground to determine if the sensor is damp. The resistance value should be greater than 20 megohms.
3. Measure the resistance between the electrodes and the liquid contact. This indirectly assesses the general condition of the electrode and liner surface. This includes checking for deposits on the electrode surface and liner, and whether the deposits are conductive or insulating. The resistance between them should be between 1000 ohms and 1 megohm.
Through the above content, we have learned the methods for checking the accuracy of electromagnetic flow meters. When checking the accuracy of an electromagnetic flow meter, you can follow the above methods. You also need to check the zero point of the magnetic flow meter when it is filled with liquid and the liquid is not flowing, and then adjust it according to the actual situation.
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