The flow sensor converts the volumetric flow of the conductive liquid flowing in the conduit [3] into a linear electrical signal. Its conversion principle is the famous Faraday's law of electromagnetic induction, that is, the conductor passes through a magnetic field, cuts the electromagnetic wire, and generates an electromotive force. The magnetic field of the flow sensor is realized by excitation, which is divided into DC excitation, AC excitation and low frequency square wave excitation. Most current flow sensors use low-frequency square-wave excitation. The transmitter is composed of excitation circuit, signal filtering and amplification circuit, A/D sampling circuit, microprocessor circuit, D/A circuit and transmission circuit. Electromagnetic flowmeter installation requirements must be installed at the lowest point of the pipeline or the vertical section of the pipeline, but must be in the case of full pipe, the requirements for the straight pipe section is 3D after the first 5D, so as to ensure the electromagnetic flowmeter Use and accuracy requirements.
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