What are the causes of errors in electromagnetic flowmeters?

What are the reasons for errors in electromagnetic flowmeters

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1. The liquid in the measurement pipe is full

Appear This phenomenon is mainly due to insufficient back pressure in the pipeline or poor installation of the flow meter sensor, which causes the pipeline to be under-full. Corresponding faults will also have different manifestations depending on the degree of under-full pipe

① . When a small amount of gas is distributed in stratified flow or wavy flow in the pipeline, the measurement results will be inconsistent with the results;

② When the fluid is bubble flow or plug flow, in addition to the measurement results In addition to being inconsistent with reality, it will also cause the measurement data of the instrument to fluctuate because the bubbles instantly cover the electrode surface when flowing through the instrument sensor;

③ When the flow cross-sectional area of ​​the fluid in the pipeline increases, it means The under-full pipe status of the liquid will also increase, and the measurement data of the instrument will also fluctuate;

④ When the under-full pipe status in the pipe is serious, so severe that the water level of the liquid is below the electrode of the flow meter, The instrument will have an over-full phenomenon. This type of failure is mainly caused by the user's inaccurate estimate of his own flow range when selecting the model;

2. The measured liquid contains solids

When the measured liquid contains solids such as powder, particles or other fibers, the following faults usually occur

①. Noise occurs in the flow meter in the pipeline;

②. The electrode surface is contaminated;

③. The conductive deposit layer or insulating deposit layer in the pipeline covers the electrode surface or lining;

④. The instrument lining is worn, or the deposit layer appears, causing the fluid flow cross-sectional area to increase. Large or small;

3. Liquids that are easy to crystallize

Some liquids that are easy to crystallize can be measured with an electromagnetic flowmeter when the temperature is normal, but this is only if the pipeline has Good heat tracing, but in most cases it is difficult for the measuring tube of the electromagnetic flowmeter sensor to keep the temperature constant once the temperature drops. The liquid will crystallize and cover the surface of the pipe, causing instrument failure

4. The grounding ring material of the electromagnetic flowmeter is not properly selected

For such failures, our factory The grounding ring has been integrated into the meter during the production process of the electromagnetic flowmeter, so users do not need to worry about such problems after purchasing, as long as the meter is well grounded

5. The conductivity of the liquid Did not meet the requirements

Since the working principle of the electromagnetic flowmeter is the Ferrari electromagnetic induction principle, there are certain requirements for the conductivity of the liquid in the measured liquid, which must be ≥5μs/cm. When the conductivity of the liquid is less than At this lower limit, the measurement data of the instrument will also fluctuate