Electromagnetic flowmeter excitation method characteristics

1. Common electromagnetic flowmeter excitation methods

According to different excitation methods, electromagnetic flowmeters can be divided into three types: DC excitation, low-frequency AC excitation and high-frequency AC excitation. Among them, DC excitation is the most common and suitable for most industrial occasions.

2. Characteristics of different excitation methods

1. DC excitation

DC excitation has the advantages of good stability, high precision, and wide application range. It adopts a constant current drive method and is not sensitive to the medium. At the same time, it can eliminate the influence of temperature, pressure and other factors on the flow meter measurement, so it is widely used in industrial production.

2. Low-frequency alternating current excitation

Low-frequency alternating current excitation is also a common excitation method. It can improve the measurement accuracy of the flow meter to a certain extent and is suitable for some high-demand applications. occasion. However, low-frequency AC excitation has problems such as radiation interference and power supply occupation. In addition, it also needs certain requirements for the dielectric constant of the medium.

3. High-frequency alternating current excitation

Compared with the first two excitation methods, high-frequency alternating current excitation has higher accuracy and is suitable for some measurement occasions with extremely high accuracy requirements. However, high-frequency AC excitation requires more power resources, and there will also be certain radiation interference problems.

3. Application of electromagnetic flowmeters

In industrial production, electromagnetic flowmeters are widely used in flow measurement and control, among which DC excitation is the most widely used. Electromagnetic flowmeters can be used to measure liquids and gases, and are suitable for petrochemical, water treatment, pharmaceutical, food and other fields. At the same time, electromagnetic flowmeters also have the advantages of flexible application and convenient maintenance, and play an important role in industrial automation control.

The excitation method of the electromagnetic flowmeter is one of the key factors affecting its measurement accuracy and applicable range. Although different excitation methods have their own advantages and disadvantages, DC excitation is still the most common and applicable method. Electromagnetic flowmeters are increasingly used in industrial production and have become an important tool for flow measurement and control.