Electromagnetic flowmeters are widely used in sewage, fluorine chemical, production water, tap water industry, medicine, steel and many other aspects. Due to the principle, it can only measure conductive liquids. Although it is much better than other types of flowmeters in terms of reliability and stability, customers will still encounter some problems in the actual use process. Let me explain in detail the selection and installation of electromagnetic flowmeters:
First. 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 is also limited. Comparing it with a water meter, it is thought that it can measure a very low flow rate. Under normal circumstances, it can only measure 0.1m/s. It is difficult for an electromagnetic flowmeter to measure correctly below this flow rate. Therefore, it is necessary to clarify the flow range ratio in the early stage of ordering. When ordering, you can't order according to the original pipe diameter, it is best to determine the meter 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: that is, full pipes, and then full pipes. When the pipe is not full, it is easy to cause the flowmeter to jump randomly:
Third. Like other flowmeters, electromagnetic flowmeters also have protection levels. Generally, the integrated protection level is IP65, and the split type is IP68 (for sensors). If the customer has requirements for the installation environment of the instrument, the installation location is underground. In wells or some other wet places, it is recommended that customers choose the split type. In order to avoid damage to the instrument due to wrong selection.
Fourth, the electromagnetic flowmeter can measure corrosive liquids, but at the beginning of the order, the customer should correctly provide other measurement medium properties, so as to avoid errors in the selection of the electrode during the selection, which will lead to the scrapping of the sensor in the later use process, which will bring inconvenience to customers and economic loss.
Fifth, although the electromagnetic flowmeter is relatively reliable and will not be damaged under normal circumstances, due to its principle, the electrode surface of the sensor has been in contact with the liquid. After a long time, the electrode surface is more likely to be polluted. Therefore, in general, the electromagnetic flowmeter is recommended to be removed to clean the electrode once a year to a year and a half to ensure the measurement accuracy of the entire flowmeter when the customer has the conditions to disassemble it. Any instrumentation requires "maintenance", and electromagnetic flowmeters are no exception.
Sixth, when the main line is a vertical pipeline, in general, 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 the installation of full pipes, this is also very important, followed by the distance between the front and rear straight pipes.
Choose a place that is easy to maintain and easy to move around. The flowmeter should be installed at the back end of the pump, never on the suction side; the valve should be installed on the downstream side of the flow.
