虽然是老式流量计，但他却有新式流量计无可比拟的优越性： Although the electromagnetic flowmeter is an old-fashioned flowmeter, it has unparalleled advantages of the new flowmeter:
With the development of science and technology, new types of flow meters are constantly emerging, with a wide variety and different performances, and their use conditions and technical parameters are also different. Problems, installation difficulty, performance-price ratio and other issues were carefully analyzed and compared, and the electromagnetic flowmeter was considered to be sensitive, linear, highly accurate, and not affected by the temperature and viscosity of the measured medium during the measurement Factors influence the advantages. 1. The electromagnetic flowmeter has high accuracy, good linearity, and stable operation, which improves the accuracy of the measurement and the credibility of the data. It overcomes the problem that some meters are not stable and the measurement data is unreliable. After several on-site comparisons, the errors were within the control range, which strengthened the trust in the meter, ended the unscientific measurement method for calculating the water volume according to the performance curve of the pump, and effectively took the data collected by the meter to avoid Human Factors. 2. The electromagnetic flowmeter has a simple structure, the sensor has no moving parts, and there is no measurement error or instrument failure due to mechanical motion wear or foreign matter entanglement, so the failure rate is very low, and the maintenance amount is greatly reduced, thereby saving a lot of manpower and material resources. 3. The electromagnetic flowmeter has a variety of interface circuits, which can be easily connected to a data acquisition terminal or computer to achieve data collection, analysis, and management automation. 1. Establish the operation file of the electromagnetic flowmeter, including the manufacturer, model, production date, installation location, pipe diameter, calibration time, etc. of the flowmeter to facilitate the maintenance and management of the meter. 2. Strengthen inspections and inspections and carry out regular test calibration. We mainly use two methods, one is to use a relatively high-precision portable flowmeter and electromagnetic flowmeter for measurement comparison; the second is to use a flow meter calibrator to verify the flow converter and check the various items Whether the technical indicators are correct and test data are archived. 3. Compare the test data with the previous test results, carefully analyze the suspicious data that appears, find possible causes, deal with them in a timely manner, and make an analysis report of the operation of the flow meter.
The correct use and maintenance of electromagnetic flowmeters are especially important!
安装位置时需特别注意 Pay special attention when selecting the installation position of the electromagnetic flowmeter
· The axis of the measuring electrode must be approximately horizontal; · The measuring pipe must be completely filled with liquid; · There must be at least 5xD (D is the inside diameter of the flowmeter) straight pipe section in front of the flowmeter and at least 3xD (D is the flow rate in the rear) Inner diameter) length of straight pipe section; to facilitate installation and disassembly, a pipe expansion joint can be installed behind the flow meter. · The direction of fluid flow is the same as the arrow direction of the flowmeter; · A vacuum in the pipeline will damage the lining of the flowmeter and special attention should be paid; · There should be no strong electromagnetic field near the flowmeter; Space for installation and maintenance; · if the measuring pipeline is vibrated, there should be fixed supports on both sides of the flowmeter; · the distance between the mixing point and the flowmeter should be at least 30 × D ( D is the internal diameter of the flowmeter); In order to facilitate the cleaning and maintenance of the flowmeter in the future, a bypass pipe should be installed, and the straight pipe section of the flowmeter should be 5D before and 3D. · When installing the PTFE-lined flowmeter, the bolts connecting the two flanges should be tightened evenly, otherwise the PTFE-lined is easy to be crushed. It is best to use a torque wrench.
安装要求 Installation requirements of electromagnetic flowmeter
· It should be installed in the lower part of the horizontal pipeline and vertically upwards, avoiding the highest point and vertical downwards of the pipeline: · It should be installed in the upward part of the pipeline; · Installed in the open drainage pipeline, it should be installed in the lower part of the pipeline · If the pipe drop exceeds 5m, install an exhaust valve downstream of the sensor; · Control valves and shutoff valves should be installed downstream of the sensor, not upstream of the sensor; · The sensor must not be installed at the pump inlet and outlet Should be installed at the pump outlet; · The way to install the flowmeter in the measurement well: choose a straight pipe section filled with liquid, such as a vertical section of the pipe (the flow direction is suitable from bottom to top) or a horizontal pipe filled with liquid (the entire pipe The lowest point in the road is appropriate), during the installation and measurement process, non-full pipe conditions must not occur;
The measurement position should be selected at a position greater than 5D upstream and a 3D straight pipe section downstream;
The selection of measurement points should be as far away as possible from pumps, valves and other equipment to avoid interference with the measurement;
The measurement point should be selected as far away as possible from high-power radio stations, strong magnetic interference sources, etc.
1.Inlet 2.Overflow pipe 3.Inlet grid
4.Cleaning hole 5.Flow meter 6.Short tube
7.Outlet 8.Drain valve 9.Drain valve