How to maintain electromagnetic flow meter to extend its service life

As a key equipment in industrial production and process control, the accuracy and stability of electromagnetic flow meters are crucial to the efficiency of the production process and product quality. In order to ensure that the electromagnetic flow meter can operate stably for a long time and extend its service life, comprehensive management and maintenance are required from multiple aspects.

1.Zero point inspection and adjustment of electromagnetic flow meter

Before the electromagnetic flow meter is put into operation, the zero point must be adjusted when the sensor is filled with liquid and in a static state. Once it is put into operation, the flow stop zero point check should be carried out regularly according to the conditions of use. Especially for those unclean liquids that are easy to precipitate, contaminate electrodes or contain solid phases, more inspections should be done at the beginning of operation to determine the normal inspection cycle. It is worth noting that electromagnetic flow meters using AC excitation are more likely to produce zero point drift than rectangular wave excitation methods, so more attention should be paid to inspection and adjustment.

For example, in oil drilling and cementing projects, high-pressure electromagnetic flow meters are used to measure the flow of cement slurry. The meter is used intermittently, and the sensor measuring tube is rinsed with clean water after use. However, due to incomplete cleaning, the cement slurry remaining on the inner wall of the measuring tube solidifies into a thin layer, which eventually causes the meter to malfunction. Another example is the electromagnetic flow meter used on the electrolytic cutting process device, which gradually weakens the flow signal due to the deposition of iron oxide on the tube wall to form a short circuit.

2. Methods to extend the service life of electromagnetic flow meter

Installation: The installation of the electromagnetic flow meter must strictly follow the requirements of the manufacturer's instructions and relevant national standards to ensure its service life. During the installation process, attention should be paid to all details to ensure the best installation state.

Grounding system inspection: Regularly check the grounding system, including grounding wires, grounding rings, grounding terminals, etc. to ensure that they are in good contact and that the grounding system is not affected by strong current or electromagnetic induction.

Waterproof and sealing: Pay attention to the waterproof performance of the instrument, and regularly check the sealing of the wiring port, protection tube, sealing joint and case to prevent moisture intrusion and cause malfunctions.

Lining inspection: Check the lining of the electromagnetic flow meter regularly, especially when the medium contains impurities, which may cause severe wear to the lining.

Pipeline installation inspection: Regularly check the pipeline installation, including leakage, pipeline vibration, loose bolts and bracket reliability.

Anti-corrosion and insulation: Regularly check the anti-corrosion and insulation measures of the flow meter to ensure that they are in good condition to prevent environmental factors from damaging the instrument.

To sum up, through scientific and reasonable maintenance and care methods, the stable operation of the electromagnetic flow meter can be ensured and its service life can be extended.