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Five elements to consider in the process of selecting an electromagnetic flow meter

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Five elements to consider in the process of selecting an electromagnetic flow meter

Five elements to consider in the process of selecting an electromagnetic flow meter


Electromagnetic flowmeter application areas

Because of its unique advantages, electromagnetic flowmeter is widely used in chemical fiber, food, paper, sugar, mining and metallurgy, water supply and drainage, environmental protection, water conservancy, waterworks, iron and steel, petroleum, pharmaceuticals and other industrial fields, used to measure a variety of acid, alkali, salt solution, mud, pulp, pulp, pulp, coal water slurry, corn slurry, fiber slurry, grain slurry, milk of lime, sewage, cooling water, water supply and drainage, salt water, hydrogen peroxide, Beer, wort, various beverages, black liquid, green liquid and other conductive liquid media volume flow.

1, electromagnetic flowmeter measurement essentially conductive liquid. Conductivity only refers to the liquid's ability to conduct electricity. The use of electromagnetic flowmeter can easily measure the minimum conductivity of 10vS/cm of liquid. Typically, electromagnetic flow meters can measure conductive water, wastewater, slurries, acids, alkalis, juices, pulp, etc. pH also plays an important role here. If the pH is less than 7, the application is acidic. The chemical compatibility of the liquid forms the basis for selecting the electrodes and lining materials for the flowmeter to suit the particular application, so that if the application is a conductive waveform, an electromagnetic flowmeter can be used with certainty. They are best suited for applications in slurries that cannot be measured by many other types of flow meters. In addition, electromagnetic flowmeters cannot be used to measure hydrocarbons and gases.

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2. The next important thing to know is the process parameters, including operating temperature, pressure and speed. Temperature is an important parameter to know, as the selection of the liner is based on this information. The liner of an electromagnetic flowmeter provides insulation and is resistant to erosion and abrasion. Depending on the rated temperature, a suitable liner is selected. For example, for operating temperatures up to 50 degrees Celsius, a hard rubber liner can be used, while for high temperature ratings up to 120 degrees Celsius, PTFE (polytetrafluoroethylene) is recommended by engineering professional staff. Hard rubber, PTFE, neoprene, polyurethane, PFA, etc. are the types of linings available, and pressure ratings are required for flange scale selection. In order to properly size the flow meter, the velocity of the liquid, as well as the minimum and * flow rates, should also be mentioned. This accurately sized flow meter will provide the required accuracy and better results.

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3, the next topic to be asked is what output is needed for the flow meter. The more widely used industrial output is 4-20mA analog current output. 4-20mA output is proportional to the flow rate of the liquid, which can be further transmitted to the PLC for control, to know the amount of liquid, you can choose the digital output, i.e. pulse output. For example, the flow meter generates a pulse for every 5 liters of liquid flowing through the pipe. If the total number of pulses noted in a second is 10, then we can easily calculate the flow rate as (10 pulses) in x 5 liters) = 50 liters per second. This can be easily converted to scale engineering units such as m3/hr and gallons/min. Batching and metering applications often require pulses from the flow meter.

4. Another major factor in selecting an accurate electromagnetic flowmeter is the power requirements. To power the meter in the field, it is necessary to check whether the power supply is available. If the applications of electromagnetic flowmeter requires the meter to be installed in a remote area where there is a lack of electricity, the battery option is always available. Battery-powered electromagnetic flowmeters can easily meet the power requirements, and according to the electromagnetic flowmeter manufacturer's specifications, the typical life of the battery is 5-10 years. If a power supply is available, either 24 VDC or 220V AC can be used, depending on the particular application.

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5, for some users, the cost is to choose the basic requirements of the flow meter, while for many users, the function is very important. Must know to pay for the flow meter to get the correct value of liquid flow measurement. For this reason, the selected flowmeter should have good correctness and reliability, so that people can get the price paid. Moreover, no one likes a flow meter that requires frequent maintenance. An electromagnetic flow meter contains no moving parts and requires very little maintenance. It can usually be used in any size line with high accuracy and no pressure loss. Keep in mind that applications of electromagnetic flowmeter where accuracy is important (0.2%-05% range), it is safe to assume that an electromagnetic flowmeter will be used over other types of flowmeters.

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