Widely used in petroleum, chemical, metallurgy, textile, food, pharmaceutical, papermaking and other industries as well as environmental protection, municipal management, water conservancy construction and other fields. The measuring principle is Faraday's law of electromagnetic induction. It is an instrument for measuring the flow of conductive fluid according to the electromotive force induced by a conductive fluid when magnetic field is applied. The main components of the sensor are: measuring tube, electrode, excitation coil, iron core and yoke housing. .
    Electromagnetic flowmeter failure analysis during operation:
    Run-time failure is a failure that occurs after the electromagnetic flowmeter has been commissioned and operated for a certain period of time. Common operational failures are caused by factors such as the adhesion of the inner wall of the flow sensor, lightning strikes, and changes in environmental conditions.
    1, sensor inner wall adhesion layer
    Since electromagnetic flowmeters are commonly used to measure dirty fluids, after a certain period of operation, an adhesion layer accumulates on the inner wall of the sensor and often causes failure. These faults are often caused by too much or too little conductivity of the adhesion layer. If the attachment is an insulating layer, the electrode circuit will be open circuit, the meter can not work properly; if the adhesion layer conductivity is significantly higher than the fluid conductivity, the electrode circuit will appear short circuit, the instrument can not work properly. Therefore, the adhered scale layer in the measuring tube of the electromagnetic flowmeter should be removed in time.
    2, lightning strike
    Lightning strikes easily induces high voltage and inrush currents in the instrument line, causing damage to the meter. It is mainly introduced through the power line or the excitation coil or the flow signal line between the sensor and the converter, and is particularly introduced from the control room power line.
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