Electromagnetic flowmeter is an automatic metering instrument for measuring liquid flow, which is mainly used to measure the instantaneous flow of fluid medium and accumulate the flow. The collected data is transmitted to the upper computer operating system or automatic control system through communication cable or wireless mode, and the system analyzes the measured data, so as to control the fluid in the process pipeline accordingly. The flowmeter is called the eye of industrial automation, through which the data such as the flow rate and velocity of the medium in the pipeline can be known in real time.

The measuring principle of electromagnetic flowmeter is based on Faraday's law of electromagnetic induction. The sensor part consists of a coil, an electrode and an insulating lining. When measuring, the excitation coil in the sensor is energized to generate a magnetic field. When the conductive fluid passes through the magnetic field, due to the force of cutting the magnetic field lines, tiny induced electromotive force is generated. These tiny induced electromotive forces are collected by electrodes and transported to the conversion part of the instrument. The signals are amplified and corrected, and then converted into corresponding flow data through formulas, and finally displayed on the instrument or output to the upper computer system.

Schematic diagram

When the conductive fluid flows through a magnetic field perpendicular to the flow direction, the conductive fluid induces an induced voltage E proportional to the average flow rate. The induced voltage is detected by two electrodes in direct contact with the fluid, amplified, filtered and shaped by the converter and then sent to the single chip microcomputer to complete the display and output control of instantaneous flow and accumulated flow. E=KBVD where: E-induced voltage? K-instrument constant B-magnetic induction intensity V-average flow velocity on the surface of measuring tube D-flowmeter diameter.

Product structure diagram

A good electromagnetic flowmeter has high measurement accuracy and stable product performance. At present, the accuracy of electromagnetic flowmeter is generally 0.3 and 0.5, and some small-caliber products can achieve 0.2. Because of the particularity of its measuring principle, it is necessary to measure the medium with a certain conductivity (generally greater than 5us/cm), and there are also certain requirements for measuring the initial flow (generally greater than 0.5m/s).

TSD electromagnetic flowmeter has many advantages in measuring water-related fluid flow and is widely used in various industries.

(1) There is no obstruction and pressure loss caused by over-current parts in the measuring pipe, so the requirements for straight pipe section are relatively low;

(2) High measurement accuracy, strong stability and strong anti-vibration interference ability;

(3) The measurement is not affected by the changes of fluid density, viscosity, temperature, pressure and conductivity;

(4) It has a variety of electrode and lining choices, and has strong medium corrosion resistance.