Insertion electromagnetic flowmeter excitation in several ways?

Time: 2024-10-28
Equipment Configuration:Insertion electromagnetic flowmeter

Electromagnetic flowmeter is a device for measuring the flow of liquids, which utilizes the principle of electromagnetic induction to measure the flow rate of conductive liquids.

Project Overview

  First, the electromagnetic flowmeter excitation principle

  Electromagnetic flowmeter is a device for measuring the flow of liquids, which utilizes the principle of electromagnetic induction to measure the flow rate of conductive liquids. In the electromagnetic flowmeter, the electrodes on the liquid induction, resulting in induction of electric potential, by calculating the ratio of electric potential and liquid velocity to calculate the flow rate.

  In order to ensure the effect of electrode induction on the liquid, it is necessary to provide the electromagnetic flowmeter with an excitation signal, i.e., a certain voltage and current are applied to the electrode to generate a magnetic field. According to different excitation methods, electromagnetic flowmeter accuracy and scope of application will be different.

  Second, the electromagnetic flowmeter excitation

  1. AC excitation

  AC excitation is a common excitation method, which generates magnetic field by applying sinusoidal voltage and current. The advantage of AC excitation is that it can respond quickly to changes in flow rate, suitable for occasions with large changes in flow rate, but the accuracy is lower. 2.

  2. DC excitation

  DC excitation is a more stable excitation method, which applies a constant voltage and current to generate a magnetic field. The advantages of DC excitation are high precision and good stability, but the response speed is slower, and it is suitable for occasions with small flow changes.

  3. Pulse excitation

  Pulse excitation is a kind of excitation method suitable for small flow measurement, which generates a magnetic field by applying high voltage and current for a short period of time. The advantage of pulse excitation is that it can increase the sensitivity of electromagnetic flowmeter, but it needs special circuit design and adjustment.

  4. Dual-frequency excitation

  Dual-frequency excitation is a combination of AC and DC excitation, it is through the superposition of AC and DC signals to generate a magnetic field. The advantage of dual-frequency excitation is that it can maintain the fast response speed of AC excitation and the precision and stability of DC excitation.

  Third, conclusion

  Electromagnetic flowmeter excitation method has an important impact on its measurement accuracy and applicability. Different excitation methods have their own characteristics and applicable occasions, need to be selected according to the specific circumstances. This paper introduces the common excitation mode of electromagnetic flowmeter, hope to provide readers with reference and help.

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