Abstract: The electromagnetic flowmeter is developed through the principle of electromagnetic induction of Ferrari, so its advantages are also effectively inherited, but the shortcomings are that it will be subject to external electromagnetic interference. If it is not effectively dealt with these external factors during installation, it is easy. The electromagnetic flowmeter is subject to errors in measurement.
Below we will summarize five factors that mainly affect the error of the electromagnetic flowmeter.
1. Measure the liquid in the pipeline as a full tube
This phenomenon is mainly caused by insufficient back pressure in the pipeline or poorly installed pipe of the flowmeter, and the corresponding faults should also be different in the degree of unfilled pipe.
1. When a small amount of gas is distributed in a stratified or wavy flow in the pipeline, the measurement result may not match the result;
2. When the fluid is a bubble flow or a plug flow, in addition to the measurement result is not in accordance with the actual situation, it will also cover the electrode surface instantaneously when the bubble flows through the meter sensor, thereby causing fluctuations in the measurement data of the meter;
3. When the flow cross-sectional area of ​​the fluid in the pipeline increases, it means that the state of the liquid is not full, and the measurement data fluctuation of the meter may also occur;
4. When the pipe is not full, the water level of the liquid is below the electrode of the flowmeter, and the instrument will have a fullness. This type of failure is mainly because the user does not estimate the flow range during the selection. Quasi-induced
2 , measuring the liquid contains solids
When the measured liquid contains solids such as powder, granules or other fibers, it generally exhibits the following failures.
1. Noise occurs in the flowmeter inside the pipeline;
2. The surface of the electrode is dirty;
3. A conductive layer or an insulating deposited layer in the pipe covers the electrode representation or lining;
4. The instrument lining is worn or the deposit layer is formed to increase or decrease the cross-sectional area of ​​the fluid flow;
3 , easy to crystallize liquid
Some liquids that are easily crystallized can be measured using an electromagnetic flowmeter when the temperature is normal, but the premise is that the pipe has good heat tracing, but in most cases, the measuring tube of the electromagnetic flowmeter sensor is difficult to keep the temperature constant. Once, due to the temperature drop. The liquid will crystallize on the surface of the pipe, causing instrument failure.
4 , the grounding ring material of the electromagnetic flowmeter can not be selected
For such faults, the electromagnetic flowmeter of our factory has already integrated the grounding ring in the instrument during the production process. The users of this kind of problem do not have to worry after purchasing, as long as the grounding of the instrument is done.
5 , the conductivity of the liquid does not meet the requirements
Since the working principle of the electromagnetic flowmeter is the principle of Ferrari electromagnetic induction, the conductivity of the liquid in the measured liquid must have a requirement of ≥5 μs/cm . When the conductivity of the liquid is less than the lower limit, the meter will also be made. Measurement data fluctuates
Summary: From the above faults, it can be concluded that most of the faults can be effectively solved in the selection and installation stage. Therefore, after purchasing the instrument, the user recommends collecting time to read the relevant installation and operation of the instrument to avoid The installation should be incorrectly installed and the instrument may be damaged seriously.
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