Electromagnetic flowmeter is a new type of flowmeter that developed rapidly with the development of electronic technology in the 1950s and 1960s.
Electromagnetic flowmeter is a new type of flowmeter that developed rapidly with the development of electronic technology in the 1950s and 1960s. An electromagnetic flowmeter is an instrument that uses the principle of electromagnetic induction to measure the flow rate of conductive fluid based on the electromotive force induced when a magnetic field is applied to the conductive fluid.
1. Strong magnetic field
Because it is generally noted to stay away from strong magnetic fields during installation, there is not much practical experience in the effects of strong magnetic fields.
2. Strong electromagnetic waves
The electromagnetic flowmeter meets the requirements of electromagnetic compatibility and works normally in the specified radiated electromagnetic field environment. In this environment, it will not cause a reduction in instrument performance and Poor work.
When a separate electromagnetic flowmeter has large common-mode interference on site, the possibility of strong radio waves becoming an interference source must be considered in the analysis of the cause of the failure. This instance is a rare fault during the debugging period.
3. Stray current in pipelines
After the electromagnetic flowmeter is properly grounded, the influence of most stray currents in pipelines can be avoided. Depending on the situation, even if you use a thick wire to span the flow sensor and adjust the grounding, it will be affected by the floating current, and other countermeasures will be required.
4. Changes in ground potential
Changes in ground potential affect flow measurement. For example, if a voltage drop occurs in the ground wire of other machines, the ground potential of the electromagnetic flowmeter can change, forming a large Common mode noise can affect measurements.
5. Moisture immersion
Electromagnetic flowmeters used in the water supply and drainage industry often place the flow sensor in an instrument well below the horizon, so they are often immersed in rainwater that is not discharged in time. Even immersed in water for a long time. Even if the shell protection level is ip67 (dust dust immersion level for a short time) and ip68 (dust continuous immersion level), the sealing gasket connecting the terminal box and the cable entry sealing gasket are not crimped and sealed. Due to the leakage of the metal ferrule, the metal ferrule Does not match the outer diameter of the cable.
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