E+H electromagnetic flowmeter law of electromagnetic induction

Due to the principle of the E+H electromagnetic flowmeter, the sensor electrode surface is always in contact with the liquid. Over time, the electrode surface is more susceptible to contamination. The E+H electromagnetic flowmeter can measure corrosive liquids, but customers must correctly provide other measurement medium properties at the initial stage of ordering to avoid errors in electrode selection during model selection, which may lead to the sensor being scrapped during later use and causing inconvenience to customers. and economic losses. Although the electromagnetic flowmeter has relatively good reliability, it will not be damaged under normal circumstances. Therefore, under normal circumstances, if the customer has the conditions to dismantle the E+H electromagnetic flowmeter, it is recommended to disassemble it and clean the electrodes once every one to one and a half years. Ensure the measurement accuracy of the entire flow meter. Just like your beautiful car, regular maintenance of the electromagnetic flowmeter is the best.

The working principle of the E+H electromagnetic flowmeter is based on Faraday's law of electromagnetic induction. When a conductor moves within a magnetic field, an induced electromotive force will be generated at both ends of the conductor that are perpendicular to the direction of the magnetic field and the direction of motion. The size of the electromotive force is proportional to the speed of the conductor and the magnetic induction intensity of the magnetic field. On the one hand, the electromagnetic flow converter provides a stable excitation current to the electromagnetic flow sensor excitation coil so that B is a constant. At the same time, the E+H electromagnetic flowmeter amplifies and converts the electromotive force induced by the sensor into a standard current signal or frequency signal to facilitate flow. display. The electromagnetic flowmeter consists of two parts: an electromagnetic flow converter and an electromagnetic flow sensor. The separate type also requires a double-shielded cable to connect the converter and sensor.

The function of E+H electromagnetic flowmeter is to generate a uniform DC or AC magnetic field. The DC magnetic circuit is implemented with magnets. Its advantage is that the structure is relatively simple and is less disturbed by the AC magnetic field. However, it easily polarizes the electrolyte liquid passing through the measurement catheter, causing the positive electrode to be surrounded by negative ions and the negative electrode to be surrounded by positive ions. , that is, the polarization phenomenon of the electrodes, and causes the internal resistance between the two electrodes to increase, thus seriously affecting the normal operation of the instrument. When the diameter of the pipe is large, the magnet will be large, bulky and uneconomical. Therefore, E+H electromagnetic flowmeters generally use alternating magnetic fields and are generated by 50HZ power frequency power supply. Its function is to elicit an induced potential signal that is proportional to the measured value. The electrodes are generally made of non-magnetic stainless steel and are required to be flush with the lining so that fluid can pass through unimpeded. The E+H electromagnetic flowmeter should be installed in the vertical direction of the pipe to prevent sediment from accumulating on it and affecting the measurement accuracy.

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