Electromagnetic flow meter is a commonly used flow measurement instrument, widely used in industrial production, chemical industry, water conservancy, environmental protection and other fields. This article will introduce the principles, characteristics, usage and purchasing considerations of electromagnetic flow meter.

1. Principle

Electromagnetic flow meter is an instrument that uses Faraday's law of electromagnetic induction to measure the flow of liquid in conductive pipes. The principle is: when a conductor (liquid) moves in a magnetic field, an induced electromotive force will be generated on both sides of the conductor, which is proportional to the speed of the conductor. Therefore, by measuring the electromotive force on both sides of the conductor, the speed of the conductor can be calculated and the flow rate can be obtained.

2. Characteristics

Non-intrusive measurement: The sensor of the electromagnetic flow meter does not need to contact the fluid being measured, so it will not affect the flow state of the fluid being measured, and will not be affected by particles, foam and other substances in the fluid, ensuring the accuracy of the measurement.

High accuracy: The measurement accuracy of electromagnetic flow meter is high, usually within ±0.5%.

Strong applicability: The electromagnetic flow meter is suitable for flow measurement of various conductive liquids, whether it is corrosive liquids, viscous liquids or dirty liquids.

High reliability: The sensor of the electromagnetic flow meter has no moving parts, so there is no risk of wear and failure, simple maintenance and long service life.

3. Use

The use of electromagnetic flow meter is relatively simple and mainly includes the following steps:

Installation: Fixedly connect the sensor of the electromagnetic flow meter to the pipe under test, and connect the power supply and signal lines.

Calibration: According to the flow rate and properties of the liquid to be measured, parameter settings and calibration of the electromagnetic flow meter are performed to ensure the accuracy of the measurement.

Start: Start the power supply of the electromagnetic flow meter and perform measurement. Normally, electromagnetic flow meter will output 4-20mA analog signals and digital signals for real-time monitoring and recording of liquid flow.

Maintenance: Clean and maintain the electromagnetic flow meter regularly to ensure measurement accuracy and service life.

4. Procurement precautions

1. Measuring range: When selecting an electromagnetic flow meter, the measuring range should be determined based on parameters such as the flow range and viscosity of the liquid to be measured. Generally speaking, the measurement range of an electromagnetic flow meter should be slightly larger than the flow range of the liquid being measured to ensure its accuracy and reliability.

2. Accuracy of electromagnetic flow meter: The accuracy of electromagnetic flow meter is important when choosing.One of the factors to consider. Choosing the appropriate accuracy level can effectively ensure the accuracy of the fluid being measured. Generally speaking, the accuracy level of electromagnetic flow meter is in0.5%~1.5%Among them, users can choose according to actual needs.

3. Pipe diameter and installation method: When selecting an electromagnetic flow meter, you also need to consider the diameter and installation method of the pipe being measured. Normally, electromagnetic flow meter are suitable for pipes with diameters ranging from DN10 to DN3000, and different installation methods can be selected according to actual needs, such as flange connection, plug-in type, and pipe set type, etc.

4. Temperature, pressure and medium: The temperature, pressure and chemical properties of the measured medium are also important factors to consider when selecting an electromagnetic flow meter. Different types of electromagnetic flow meter are suitable for different media, such as water, sewage, acid and alkali liquids, etc. In addition, users also need to select the appropriate medium temperature and pressure range according to actual needs to ensure the performance and life of the electromagnetic flow meter.

5. Brand and after-sales service: When choosing an electromagnetic flow meter, brand and after-sales service are also factors that need to be considered. Choosing an electromagnetic flow meter from a well-known brand can not only ensure its quality and performance, but also enjoy better after-sales service and technical support.

6. Conclusion

In short, electromagnetic flow meter is an important flow measurement equipment with the advantages of high precision, stability and reliability, simple operation and convenient maintenance, and is widely used in all walks of life. When selecting and using an electromagnetic flow meter, you need to fully understand its principles and characteristics, and make a selection based on the flow range, viscosity, pipe diameter, installation method, temperature, pressure, medium and other factors of the liquid being measured to ensure its performance and accuracy. At the same time, users also need to choose electromagnetic flow meter from well-known brands to ensure their quality and after-sales service.