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Intelligent electromagnetic flowmeter
1) Working temperature and working pressure The maximum working temperature of the electromagnetic flowmeter depends on the temperature of expansion, deformation and qualitative change of the material of the pipeline and the liner. It varies with the specific instrument and is generally lower than 120'C. The maximum working pressure depends on the strength of the pipe, the sealing of the electrode part, and the specification of the flange. It is generally 1.6X105-2.5X105Pa. Since the pipe wall is too thick, the eddy current loss will be increased, so the lateral pipe is made thinner.
2) The conductivity of the fluid under test must have a certain conductivity. The general requirement is that the conductivity is 10-4-10-1s/cm, and the minimum is not less than 505S/cm. Therefore, the smart electromagnetic flowmeter cannot measure the flow of non-conductive fluids such as gas, steam, and petroleum products. For a conductive medium, theoretically speaking, all induced electric potentials are generated when flowing relative to a magnetic field. In fact, the increase in the internal resistance between electrodes is limited by the distributed capacitance of the transmission line, the input impedance of the amplifier, and the measurement accuracy.
3) Flow Velocity and Velocity Distribution Electromagnetic flowmeters are also velocity instruments. The induced potential is proportional to the average flow velocity. This average flow velocity is obtained with the flow velocity at each point symmetrical to the center of the tube. Therefore, when the fluid flows in the pipe, the distribution of the velocity at each point on the cross section has a great influence on the instrument representation value. For the transmitters of circular pipe point electrodes commonly used in the industry, if the flow velocity is disrupted symmetrically with respect to the central axis of the catheter, the electromagnetic flowmeter cannot work normally. Therefore, before and after the electromagnetic flowmeter, there must be sufficient Straight sections to eliminate the effect of various local resistances on the symmetry of the velocity distribution.
The smart electromagnetic flowmeter has no other components in the pipeline, so in addition to measuring the flow of the conductive fluid, it can also be used to measure the flow rate of non-conductive liquids (in which the ionizable substances are added) of various viscosities. Electromagnetic flowmeters are often used in the nuclear power industry.