Electromagnetic flowmeters are widely used in sewage, fluorine chemical, production water, tap water industry, medicine, steel and many other aspects. The principle determines that it can only measure conductive liquids. Although it is much better than other types of flowmeters in terms of reliability and stability, some problems still occur in the actual use of customers. Let me talk about the selection and installation of electromagnetic flowmeters in detail:
1. Like other flowmeters, although the electromagnetic flowmeter has a measurement range ratio of 30:1, which is higher than that of vortex flowmeters and differential pressure flowmeters, it also has limitations. Many customers often set the meter. Comparing it with a water meter, I think it can measure very low flow rates. Under normal circumstances, it can only measure 0.1m/s. It is difficult to measure correctly with electromagnetic flowmeters below this flow rate. Therefore, the flow range ratio must be clear at the beginning of the order. When ordering, it is not possible to order according to the original pipe diameter. It is best to set the gauge diameter according to your actual flow.
Second, like other flowmeters, electromagnetic flowmeters also have requirements for straight pipes before and after installation, but they have lower requirements than other types of flowmeters, but the most critical point is to meet: full pipe, then full pipe. When the tube is not full, it is easy to cause the flowmeter to jump randomly:
Third, like other flowmeters, electromagnetic flowmeters also have a protection level. Generally, the integrated protection level is IP65, and the split type is IP68 (for sensors). If the customer has requirements for the instrument installation environment, the installation location should be underground. For wells or other damp places, it is recommended that customers choose split type. In order to avoid damage to the instrument caused by the wrong selection.
Fourth, the electromagnetic flowmeter can measure corrosive liquids, but the customer must correctly provide other measurement medium properties at the beginning of the order, so as to avoid errors in the selection of the electrode during the selection, which will cause the sensor to be scrapped in the later use process, causing inconvenience and Economic loss.
Fifth, although the reliability of the electromagnetic flowmeter is relatively good, it will not be damaged under normal circumstances, but due to its principle, the surface of the sensor electrode has been in contact with the liquid. After a long time, the surface of the electrode is easier to be contaminated. Therefore, in general, if the customer has the conditions to disassemble the electromagnetic flowmeter, it is recommended that the electrode be removed and cleaned once a year to a year and a half to ensure the measurement accuracy of the entire flowmeter. Any instrument requires "maintenance", and electromagnetic flowmeters are no exception.
6. When the main line is a vertical pipeline, under normal circumstances, the water flow is required to be bottom-up, and try not to be top-down. The latter is likely to cause relatively large flow fluctuations. In addition to full pipe installation, this is also very important, followed by the distance between the front and rear straight pipes.
Choose a place that is convenient for maintenance and activities. The flow meter should be installed at the back of the pump, never on the suction side; the valve should be installed on the downstream side of the flow.