The role of flowmeter lining Posted by : admin / Posted on : Mar 28， 2020

Why the electromagnetic flowmeter is lined? This is based on the principle of the electromagnetic flowmeter. An electromagnetic flowmeter generally has a set of coils and two electrodes. The role of the coil is to add an electric field to the fluid. The flowing conductive liquid is equivalent to a conductor. According to Faraday's law of electromagnetic induction, when a conductor cuts magnetic lines of force, a proportional to speed is generated. The role of the electrode is to measure the induced electromotive force, so only the electrode in the measuring tube is connected to the conductive liquid, and the other parts are lined. To ensure insulation, the electromagnetic flowmeter can work normally. If the section of the metal pipe with the magnetic field is also in contact with the liquid, there is a short circuit between the conductive liquid measured by the electromagnetic flowmeter and the metal tube, there will be conduction, and the potential will be conducted away, making the electromagnetic flowmeter unable to measure the potential. Therefore, the inside of the electromagnetic flowmeter is lined.
When measuring the flow rate, the conductive liquid flows at a speed V through a magnetic field perpendicular to the flow direction. The flow of the conductive liquid induces a voltage proportional to the average flow rate. The induced voltage signal passes through two or more directly to the liquid. The contacted electrodes are picked up and sent to the converter through the cable for intelligent processing, and then the LCD displays or converts into standard signals 4-20ma and 0-1khz output. In this way, the electromagnetic flowmeter can measure the flow rate of the conductive fluid. The electromagnetic flowmeter can only measure the flow of conductive liquid, so it must be lined inside.