The high-pressure electromagnetic flowmeter is composed of a high-pressure electromagnetic flow sensor and an intelligent converter produced using proprietary technology and special processes. It is specifically used for measuring the volume flow of conductive liquids or liquid-solid two-phase media such as mud, cement slurry, and high-pressure water injection under high-pressure conditions in geological, petroleum exploration, and oilfield systems.

The high-voltage electromagnetic flow sensor adopts special lining technology, which is resistant to high pressure and negative pressure. It can be used for measuring the flow rate of conductive liquids or liquid-solid two-phase media such as mud, cement slurry, and high-pressure water injection under high pressure conditions in geological, petroleum exploration, and oilfield systems.

Working principle of high-voltage electromagnetic flowmeter

The high-voltage electromagnetic flowmeter, based on Faraday’s principle of electromagnetic induction, installs a pair of detection electrodes on the pipe 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 the value is proportional to the flow rate. Its value is:

E=KBVD

In the formula:

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.

Advantages of High Voltage Electromagnetic Flow

1. The structure of the electromagnetic flowmeter sensor is simple, with no movable parts inside the measuring tube and no throttling components that hinder fluid flow;
2. Can measure the flow rate of contaminated media, corrosive media, and suspended liquid-solid two-phase flow;
3. During the measurement process, it is not affected by the temperature, viscosity, density, or conductivity (within a certain range) of the measured medium;
4. The output of an electromagnetic flowmeter is only proportional to the average flow velocity of the measured medium, and is independent of the flow state under symmetric distribution (laminar or turbulent);
5. Electromagnetic flowmeter has no mechanical inertia, sensitive response, can measure instantaneous pulsating flow, and can also measure flow in both positive and negative directions;
6. The range of caliber selection for industrial electromagnetic flow meters is wide.

High pressure electromagnetic flowmeter is an electromagnetic flowmeter produced using proprietary technology and special processes, specifically used for volumetric flow of conductive liquids or liquid-solid two-phase media such as coal water slurry, mud, and high-pressure water injection under high-pressure conditions in coal chemical measurement and control, geological exploration, oil extraction, and oilfield water injection measurement.

1. The measurement is not affected by changes in fluid density, viscosity, humidity, pressure, and conductivity;
2. The measuring tube has unobstructed flow components, no pressure loss, and low requirements for straight pipe sections;
3. The instrument can be well grounded and work stably;
4. The sensor lining gives the instrument good anti negative pressure capability;
5. Stable operation under high pressure environment, pressure resistance range: 6.3MPa~42MPa
6. The converter adopts a novel excitation method, with low power consumption, stable zero point, and high accuracy (± 0.3%); ±0.5%);
7. Flow range: 1500:1
8. The converter and sensor can be integrated or separated;
9. The conversion unit 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, alarm, and digital communication.