Stainless steel electromagnetic flowmeter

NegotiableUpdate on 01/04

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Overview

Installation requirements for stainless steel electromagnetic flowmeter: The measurement principle of electromagnetic flowmeter does not depend on the characteristics of flow rate. If there is a certain turbulence and vortex generated in the non measurement area of the pipeline (such as elbow, tangential flow restriction or upstream half open globe valve), it is irrelevant to the measurement

Product Details

Stainless steel electromagnetic flowmeterInstallation requirements:

The measurement principle of electromagnetic flowmeter does not depend on the characteristics of flow rate. If there is a certain amount of turbulence and vortex generated in the non measurement area of the pipeline (such as bends, tangential flow restrictions, or partially open shut-off valves upstream), it is irrelevant to the measurement. If there is a steady-state eddy current in the measurement area, it will affect the stability and accuracy of the measurement. In this case, some measures should be taken to stabilize the flow velocity distribution:

1. Increase the length of the front and rear straight pipe sections;

2. Adopting a traffic stabilizer;

3. Reduce the cross-section of measurement points.

Stainless steel electromagnetic flowmetersummary:

The electromagnetic flowmeter adopts the world's latest technology. By using constant current low-frequency ternary rectangular waves or dual frequency rectangular waves for excitation, it not only has the advantages of rectangular wave magnetic fields, but also overcomes the disadvantages of sine wave magnetic fields; It can also eliminate errors caused by fluctuations in power supply voltage, changes in power supply frequency, and changes in excitation coil impedance; And it has zero stability and is not affected by fluid noise interference. Therefore, it has the characteristics of high stability and high reliability.

An electromagnetic flowmeter consists of a sensor and a converter. The sensor is installed on the measuring pipeline, and the converter can be combined with the sensor to form an integrated electromagnetic flowmeter. The converter is installed within 30 meters or 100 meters of the sensor, and is connected by a shielded cable to form a separate electromagnetic flowmeter. The main components of an electromagnetic flowmeter sensor are: measuring tube, electrode, excitation coil, iron core, and magnetic yoke housing.

Measurement principle of stainless steel electromagnetic flowmeter:

Electromagnetic FlowmeterAccording to Faraday's principle of electromagnetic induction, a pair of detection electrodes are installed on the tube wall perpendicular to the axis of the measuring tube and the magnetic field lines. When the conductive liquid moves along the axis of the measuring tube, it cuts the magnetic field lines and generates an induced potential. This induced potential is detected by the two detection electrodes, and its value is proportional to the flow rate. Its value is E=KBVD equation:

E - Induced potential;

K - coefficient related to magnetic field distribution and axial length;

B - Magnetic induction intensity;

V - average flow velocity of conductive liquid;

D - electrode spacing; (Measuring the inner diameter of the tube)

The sensor uses the induced potential E as a flow signal, which is transmitted to the converter. After amplification, transformation, filtering, and a series of digital processing, the instantaneous and cumulative flow rates are displayed on a backlit dot matrix LCD. The converter has 4-20mA output, alarm output and frequency output, and is equipped with communication interfaces such as RS-485, and supports HART and MODBUS protocols.