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How to use the electromagnetic flowmeter to avoid the misunderstanding

The electromagnetic flowmeter has the characteristics of high precision and long service life, and is applied in many fields and industries such as chemical industry, environmental protection and metallurgy. However, in the course of use, due to various factors, it is easy to cause inaccuracies in the measurement results of the electromagnetic flowmeter. So what are the causes of errors in the electromagnetic flowmeter?

1. The liquid in the tube is not full

Due to insufficient back pressure or poor installation position of the flow sensor, the liquid in the measuring tube is not filled, and the failure phenomenon is different due to the degree of imperfection and the flow condition.

If a small amount of gas is stratified or wavy in the water pipe, the fault phenomenon shows an increase in error, that is, the flow measurement value does not match the actual value;

If the flow is a bubble flow or a plug flow, the fault phenomenon does not match the actual value, and the output slosh occurs due to the gas phase instantaneously covering the electrode surface;

If the gas phase of the cross-sectional area of the horizontal pipeline is increased in the stratified flow, that is, the liquid is not full, the output sloshing may occur;

If the liquid is not full, the output will be over-filled if the liquid level is below the electrode.

2. The solid phase in the liquid

The liquid contains solids such as powder, granules or fibers, and may cause failures; 1 slurry noise; 2 electrode surface contamination; 3 conductive deposition layer or insulating deposition layer covering the electrode or lining; 4 lining is worn or covered by sediment, The circulation cross-sectional area is reduced.

3. Liquids that may crystallize, electromagnetic flowmeters should be used with caution

Some easily crystallized chemical materials can be measured normally under normal temperature conditions. Since the conduits for transporting fluids have good heat insulation, they will not crystallize during the heat preservation work, but the measurement tubes of Figueres electromagnetic flow sensors are difficult to implement. Thermal insulation, therefore, when the fluid flows through the measuring tube, it is easy to cause a solid layer on the inner wall due to the temperature drop.

Since the flow meter measurement using other principles also has a crystallization problem, in the absence of other better methods, an "oring" electromagnetic flow sensor with a very short measuring tube length can be selected, and the flow meter can be used. The upstream pipeline is heat-insulated to be strengthened. In the pipe connection method, it is convenient to disassemble and disassemble the flow sensor, and it is convenient to remove the maintenance once it is crystallized.

4, the electrode and grounding ring material selection problem caused by improper

The components of the Figueres electromagnetic flowmeter that is in contact with the medium due to the mismatch between the material and the measured medium have electrodes and grounding rings. The mismatch is not only the corrosion resistance problem, but also the electrode surface effect.

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