Matters needing attention in the selection and installation of electromagnetic flowmeters

Electromagnetic flowmeters are widely used in sewage, fluorine chemical industry, production water, tap water industry, medicine, steel and many other aspects. Due to the principle, it can only measure conductive liquid. Although it is much better than other types of flowmeters in terms of reliability and stability, customers will still have some problems during actual use. Let us talk about the selection and installation of electromagnetic flowmeters in detail below. : 1. Like other flowmeters, although the measuring range ratio of the electromagnetic flowmeter is 30:1, which is higher than that of the vortex flowmeter and the differential pressure flowmeter, it is also limited. When many customers set the meter, It is often compared with a water meter, thinking that it can measure a very low flow rate. Under normal circumstances, it can only measure 0.1m/s. Below this flow rate, it is difficult for an electromagnetic flowmeter to measure correctly. Therefore, it is necessary to clarify the flow range ratio at the beginning of the order. When ordering, you can't order according to the original pipe diameter, it is best to order the meter diameter according to your actual flow. 2. Like other flowmeters, electromagnetic flowmeters also have requirements for straight pipes before and after installation, but the requirements are lower than other types of flowmeters, but the most critical point must be satisfied: full pipe, then full pipe. If the pipe is not full, it is easy to cause the flowmeter to jump randomly: 3. Like other flowmeters, the electromagnetic flowmeter also has a protection level. Generally, the protection level of the integrated type is IP65, and the split type is IP68 (for the sensor). If the customer There are requirements for the installation environment of the instrument, and the installation site is in an underground well or some other humid place. It is recommended that the customer choose a split type. In order to avoid damage to the instrument caused by wrong selection. 4. The electromagnetic flowmeter can measure corrosive liquids, but at the initial stage of ordering, the customer must correctly provide other measurement medium properties, so as to avoid errors in the selection of electrodes during model selection, which will cause the sensor to be scrapped during later use, causing inconvenience and inconvenience to customers. economic loss. 5. Although the electromagnetic flowmeter has good reliability and will not be damaged under normal circumstances, due to its principle, the electrode surface of the sensor is always in contact with the liquid. After a long time, the electrode surface is more likely to be polluted. Therefore, in general, if the customer has the conditions to disassemble the electromagnetic flowmeter, it is recommended to disassemble it and clean the electrodes once a year to one and a half years to ensure the measurement accuracy of the flowmeter. Any instrumentation needs to be 'maintained', and the electromagnetic flowmeter is no exception. 6. When the main pipeline 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 full pipe installation, 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 move around. The flow meter 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.