Adept Electromagnetic Flow Meter

A professional electromagnetic flowmeter is an instrument used to measure the volume flow rate of liquids. Measure liquid flow rate by utilizing the induced electromotive force generated by the movement of liquid in a magnetic field. It has the characteristics of high accuracy, good stability, high reliability, easy operation, and wide applicability, and is widely used in flow measurement in industries such as chemical, petrochemical, metallurgical, water treatment, environmental protection, food, and pharmaceuticals. It mainly consists of magnetic circuit system, measuring catheter, electrode, shell, lining, and converter, and is divided into two forms: integrated and split. The appropriate form is selected according to different application scenarios.

Magnetic circuit system: Its function is to generate a uniform DC or AC magnetic field. The DC magnetic circuit is achieved using a permanent magnet, which has the advantage of a relatively simple structure and less interference from AC magnetic fields. However, it is prone to polarize the electrolyte liquid inside the measuring tube, causing the positive electrode to be surrounded by negative ions and the negative electrode to be surrounded by positive ions, which is the polarization phenomenon of the electrode and leads to an increase in internal resistance between the two electrodes, thus seriously affecting the normal operation of the instrument. When the diameter of the pipeline is large, the permanent magnet is also large, bulky, and uneconomical. Therefore, electromagnetic flow meters generally use alternating magnetic fields, which are generated by 50HZ power frequency excitation.

Measurement catheter: Its function is to allow the measured conductive liquid to pass through. In order to divert or short-circuit the magnetic flux when the magnetic field lines pass through the measuring tube, the measuring tube must be made of materials that are non magnetic, low conductivity, low thermal conductivity, and have a certain mechanical strength. Non magnetic stainless steel, fiberglass, high-strength plastic, aluminum, etc. can be selected.

Electrode: Its function is to introduce an induced potential signal that is proportional to the measured value. Electrodes are generally made of non magnetic stainless steel and are required to be flush with the lining to ensure unobstructed fluid flow. Its installation position should be in the vertical direction of the pipeline to prevent sediment from accumulating on it and affecting measurement accuracy.

Shell: Made of ferromagnetic materials, it is the outer cover of the distribution system excitation coil and isolates the interference of the external magnetic field.

Lining: There is a complete layer of electrical insulation lining on the inner side of the measuring conduit and the flange sealing surface. It comes into direct contact with the measured liquid, and its function is to increase the corrosion resistance of the measuring tube and prevent the induced potential from being short circuited by the metal measuring tube wall. The lining materials are mostly corrosion-resistant, high-temperature resistant, and wear-resistant polytetrafluoroethylene plastics, ceramics, etc.

Converter: The induced electromotive force signal generated by liquid flow is very weak and greatly affected by various interference factors. The function of the converter is to amplify and convert the induced electromotive force signal into a unified standard signal and suppress the main interference signal. Its task is to amplify and convert the induced potential signal Ex detected by the electrode into a unified standard DC signal.

Characteristic

1. Measurement is not affected by changes in fluid density, viscosity, temperature, pressure, and conductivity;

2. There are no obstructed flow components inside the measuring tube, no pressure loss, and lower requirements for straight pipe sections. Has unique adaptability to slurry measurement;

3. Reasonable selection of sensor lining and electrode materials, which have good corrosion resistance and wear resistance;

4. The converter adopts a novel excitation method, which has low power consumption, stable zero point, and high accuracy. The flow range can reach 150:1;

5. The converter can be integrated or separated from the sensor;

6. The converter adopts a 16 bit high-performance microprocessor, 2x16LCD display, convenient parameter setting, and reliable programming;

7. The flowmeter is a bidirectional measurement system equipped with three integrators: forward total, reverse total, and difference total; It can display positive and negative flow rates and has multiple outputs: current, pulse, digital communication, and Hart;

8. The converter adopts surface mount technology (SMT) and has self inspection and self diagnosis functions;

9. The measurement accuracy is not affected by changes in fluid density, viscosity, temperature, pressure, and conductivity. The sensor induced voltage signal has a linear relationship with the average flow rate, so the measurement accuracy is high.

10. Measure the unobstructed flow components inside the pipeline, therefore there is no additional pressure loss; There are no movable parts inside the measurement pipeline, so the sensor has an extremely long lifespan.

11. Due to the induction voltage signal being formed in the entire space filled with a magnetic field, which is the average value on the pipeline load surface, the straight pipe section required by the sensor is shorter, with a length of 5 times the diameter of the pipeline.

12. The converter adopts the latest and most advanced international microcontroller (MCU) and surface mount technology (SMT), with reliable performance, high accuracy, low power consumption, stable zero point, and convenient parameter setting. Click on the Chinese display LCD to display cumulative flow, instantaneous flow rate, flow rate percentage, etc.

13. A bidirectional measurement system that can measure forward flow and reverse flow. Adopting special production processes and high-quality materials to ensure that the performance of the product remains stable for a long time.

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