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Article Link: Electromagnetic flowmeters are based on Faraday's law of electromagnetic induction and calculate fluid flow by measuring the induced electromotive force of a conducting fluid in a magnetic field. After electromagnetic flowmeter generally consists of two parts consisting of the transmitter and the transducer, the flow rate measured by the transmitter into the medium induced potential, and then converts the converted potential of the signal into a unified standard signal (4 ~ 20mA output), so that Instruct, record, or use with an electric unit combination meter.
　　
　　 How electromagnetic flowmeters generate weak signals:
　　
　　 1 , due to external vibration or a large magnetic field interference, in the absence of media flow, external vibration and other signals acting on the sensor, the introduction of " mis-flow " signal, when this signal is higher than the meter's measurement lower limit is also accumulated.
　　
　　 2. A layer of insulator adheres to the surface of the electrode, which is disturbed by external interference or the milliampere signal sent out by the electrode shows zero drift during amplification and conversion, which causes the signal to deviate from the normal value, thus causing errors.
　　
　　 3. When the pump starts, the liquid cuts the magnetic lines through the flowmeter and generates flow signals. These liquids are eventually used by subsequent links. The flow measurement value is valid and should be accumulated; when the pump stops, there will be pipelines. A small amount of liquid refluxed, cutting the lines of magnetic force in the opposite direction, also produced a small signal, but these liquids were not used in actual production, and the flowmeter still sampled the signal to accumulate, which would cause a large error.
How electromagnetic flowmeters generate weak signals
How electromagnetic flowmeters generate weak signals