The electromagnetic flowmeter is based on Faraday's law of electromagnetic induction: when the conductive liquid cuts the magnetic field lines in the magnetic field.
The electromagnetic flowmeter is based on Faraday's law of electromagnetic induction: when the conductive liquid cuts the magnetic field lines in the magnetic field, an induced electric potential is generated in the conductor. When measuring the flow rate, the conductive liquid flows through the magnetic field perpendicular to the flow direction. The flow of the conductive liquid It induces a voltage proportional to the average flow rate. The induced voltage signal is detected through two or more induction electrodes that are in direct contact with the liquid, and is sent to the converter through a cable. Through its intelligent processing, the instantaneous flow rate of the fluid is realized. Display of accumulated flow and communication between flow data and control system. There are no moving or flow-blocking parts in the measuring tube, so there is almost no pressure loss and high reliability.
Since there are no movable parts in the pipe of the electromagnetic flowmeter, the selection of the grounding ring of the electromagnetic flowmeter is particularly important.
(1) The form of the grounding ring is divided into universal type and protective type. Generally, the universal type is used. If the measured medium is abrasive, a protective grounding ring with a neck should be used to protect the lining at the inlet and outlet. , extend service life. If the electromagnetic flowmeter with a diameter of less than 200 uses polytetraethylene lining, a grounding ring should be used to protect the lining from damage when it is connected to the pipeline and installed.
(2) The material of the grounding ring should be adapted to the corrosiveness of the medium being measured, but it has lower requirements than the electrode material because it can be replaced after being corroded. Grounding rings are usually made of stainless steel or Hc alloy.
Whether it is the selection of the grounding ring or the parameters of the electromagnetic flowmeter, it is very important. When we choose the electromagnetic flowmeter, we must select the parameters in advance to ensure the accuracy of the electromagnetic flowmeter measurement data. .
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