Analysis of the installation design of the primary device of the electromagnetic flow meter

Abstract: Analysis of the installation and design information of the primary device of the electromagnetic flowmeter is provided by the excellent manufacturers of flowmeters and flowmeters. There is theoretically no limit to the installation position of the primary device, as long as the inside of the measuring tube is filled with medium at all times. It should be avoided to install near electrical equipment that may interfere with the flow measurement signal; it should also be avoided to install in a primary device. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the installation design of the primary device of the electromagnetic flowmeter. There is theoretically no limit to the installation position of the primary device, as long as the inside of the measuring tube is filled with medium at all times. It should be avoided to be installed near electrical equipment that may interfere with the flow measurement signal; it should also be avoided to be installed in the occasions where induced current may be generated in the primary device. 2. Size Usually, the inner diameter of the measuring tube of the primary device is the same as the inner diameter of the adjacent process pipeline. If in this case the average axial flow velocity at maximum flow is less than the value recommended by the manufacturer, then a smaller diameter primary device should be selected. It may also be for other reasons, such as to reduce costs or to be more rational, to choose a primary device with a diameter smaller than that of the adjacent process piping. See GB/T18659 for the tolerance of matching the inner diameter of the process pipe and the measuring pipe. 3. The electrode position will rise and concentrate on the top of the pipe because of any air bubbles, and the sediment will be deposited on the bottom of the pipe, so the primary device must be installed in this way: so that None of the electrodes are in the above positions. 4. The full pipe requires that the primary device should be installed in such a position: the liquid to be tested must be completely filled. Otherwise, the measurement will not reach the accuracy specified by the manufacturer. If necessary, an alarm device can also be installed to maintain normal measurement. For the measurement of partially filled primary devices, such as sewage flow measurement, this aspect is beyond the scope of this standard and will be specifically considered. 5. The influence of pipe fittings configuration on flow velocity distribution The precise data on the influence of flow interference may not be available, but for most electromagnetic flowmeters, if the performance change does not exceed 1%, it is recommended that any source of flow interference (such as an elbow) should be in the At least 10 pipe diameters upstream of the electrode plane. When it is unavoidable to be less than this distance, the advice of the manufacturer should be consulted. Ideally, the magnetic field configuration should keep the calibration factors of the electromagnetic flowmeter consistent regardless of flow conditions. This is possible with a flowmeter with electrodes specially configured; it is not possible with very small electrodes. In fact, when the flow velocity distribution at the electrode plane is quite different from the initial calibration, the electromagnetic flowmeter may be offset during calibration. The configuration of the pipe connections upstream of the primary unit is one of the factors that causes the particular flow velocity distribution. When the primary device is connected into the pipeline with a tapered tube, the effect of irregular flow conditions on the calibration coefficient will vary with the type of irregular flow (vortex, asymmetric, etc.) and the design of the tapered tube (convergence, expansion, taper angle) size, etc.), or decrease or increase. Eddy currents also alter the calibration system, and while flow components perpendicular to the pipe axis do not affect flow, they may have an effect on the signal. In addition, the number and distribution of vortices resulting from different configurations of upstream piping (eg, several bends in different planes) are also difficult to predict from the layout of the process piping. Therefore, when vortex flow is suspected, it is advisable to incorporate a vortex eliminator upstream of the primary unit. Some forms of vortex eliminators are described in ISO 7194. 6. Zero point check (measure) In order to check the zero point of the flowmeter, it is necessary to ensure that the flow through the primary device is zero, so that it is filled with static liquid. However, for flowmeters with synchronous pulsed DC excitation with auto-zero, this measure may not be necessary. Electromagnetic flowmeter, a domestic high-end flowmeter brand, takes customer demand as the first priority, and puts quality first, so that customers can use it with confidence. The affirmation of customers is the driving force for our progress. We strive to develop new technologies, improve product performance, use high-quality materials, and be meticulous about product quality to ensure a 100% pass rate for production testing. , Only do high-quality products, customer satisfaction is our driving force. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'A Brief Analysis of the Installation Design of the Primary Device of the Electromagnetic Flow Meter'
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