A magnetic flow meter, also known as an electromagnetic flow meter or mag meter, is a type of flow measurement device that utilizes Faraday’s law of electromagnetic induction to determine the flow rate of conductive fluids. It operates based on the principle that when a conductive fluid flows through a magnetic field, a voltage is generated across the fluid that is directly proportional to the fluid’s velocity.
The key components of a magnetic flow meter include a flow tube, which is lined with a non-conductive material to isolate the fluid from the magnetic field, and an electrode pair that is immersed in fluid. The electrodes detect the voltage generated by the fluid’s movement in the magnetic field, and this voltage is used to calculate the flow rate.
Benefits of using a magnetic flow meter
Accuracy
One of the major benefits of magnetic flow meters is their ability to accurately measure the flow rate of liquids that contain solids, fibers, or other particles. They also provide reliable performance in harsh and corrosive environments. Additionally, magnetic flow meters can measure flow in both directions and are suitable for a wide range of pipe sizes.
Non-intrusive
Magnetic flow meters are non-intrusive, meaning they do not require any physical contact with the fluid. This makes them ideal for applications where the fluid is corrosive or abrasive.
Minimal Maintenance and Calibration
These meters require minimal maintenance, and if necessary, calibration can be easily performed to ensure accurate measurements.
Corrosion Resistance
The wetted parts of a magnetic flow meter are typically made of materials such as stainless steel or corrosion-resistant alloys, allowing them to withstand corrosive fluids and harsh environments.
Bidirectional Flow Measurement
Magnetic flow meters can measure the flow rate in both forward and reverse directions, providing versatility in applications where flow direction may change.
Easy Installation
Magnetic flow meters are relatively easy to install, with options for insertion or inline installation, and they can be retrofitted into existing pipelines without significant modifications.
There are many benefits of using a magnetic flow meter. Here are the Best 8 Magnetic Flow Meters for you.
1, Magnetic type flow meter
The magnetic type flow meter offers high accuracy ranging from 0.2% to 0.5%. It is available in various sensor sizes, including 1/2″, 3/4″, DN25, 40mm dial, 2-inch, 3-inch, DN100, 4-inch, 5-inch, 6-inch, DN200, 8-inch, and can be custom-made up to 2000mm. This meter is suitable for measuring liquids with a conductivity over 5u/cm, including water, portable water, drinking water, wastewater, sewage, chemicals, acids, and more. It can handle different pressure ratings such as PN16, PN25, PN40, ANSI 150LB, ANSI 300LB, JIS 10K, and 20K.
2, Threaded magnetic flow meter
The full bore threaded electromagnetic flow meter is designed without any pressure loss or moving parts within the flow sensor. It offers versatility by allowing the selection of different liner and electrode materials to measure various liquids, including water, acids, chemical solutions, and strong corrosive liquids. The measurement accuracy remains unaffected by changes in fluid temperature, pressure, or density. It also provides a large turndown ratio, ranging from 10:1 to 100:1, allowing for flexible flow rate measurement. The available sizes for the thread magnetic flow meter range from DN10 to DN80 (3 inches).
3, Magnetic inductive flow meter
The magnetic inductive flow meter, also known as EMF, is a device used to measure the volumetric flow rate of conductive liquids by utilizing Faraday’s electromagnetic induction law. This technology found its practical application in the industrial field during the 1950s. Subsequently, in the late 1970s, the low-frequency rectangular wave excitation method gained prominence, gradually replacing the previously employed power-frequency AC excitation method.
4, Full-bore electromagnetic flow meter
The full bore magnetic flow sensor features a smooth and obstruction-free measuring tube, making it suitable for measuring liquid-solid two-phase fluids containing solid particles or fibers, such as pulp, coal water slurry, mineral slurry, mud, and sewage. It offers the advantage of no pressure loss, making it highly suitable for large-size water supply pipelines requiring low resistance. With a flow rate range of 0.5 to 10m/s, it offers a wide size range from 4mm to 2m. Additionally, it allows for bidirectional flow measurement and can be tailored to handle aggressive fluids by selecting appropriate liners and electrode materials.
5, Magnetic flow indicator
The magnetic flow indicator, also known as EMF, is a flowmeter that utilizes Faraday’s law of electromagnetic induction to measure the volumetric flow rate of conductive liquids. It has been successfully implemented in industrial applications since the early 1950s. The full-bore electromagnetic flow meter is a cost-effective solution widely employed across various industries for measuring conductive liquids. With its compact size and flexible installation options, it is highly favored by factories, equipment manufacturers, and system integrators.
6, Wastewater Flow Meter
The wastewater flow meter is a device designed to measure the volume flow of various conductive fluids or liquid-solid mixtures within a pipeline. It finds widespread application in industries such as metallurgy, papermaking, water conservation, environmental protection, printing and dyeing, oil, and coal. This versatile meter is capable of accurately measuring the volume flow of acid, alkali, salt solutions, slurry, pulp, coal water slurry, fiber suspensions, corn syrup, lime milk, sewage, drainage, hydrogen peroxide, beer, wort, beverages, and other conductive liquid media.
7, GPRS Electromagnetic flow meter
The battery-powered electromagnetic flow meter is equipped with a long-lasting lithium battery that can operate for a duration of 36 to 72 months. It incorporates a built-in GPRS/GSM/CDMA module, enabling the transmission of flow measurement data to a cloud server for wireless and remote water management. This innovative technology finds extensive applications in various fields such as irrigation and water abstraction, water treatment, municipal works, and the water industry. The integration of GPRS functionality expands its capabilities and enhances efficiency in managing water resources.
8, Electromagnetic flow meter for corrosive liquid
Electromagnetic flow meters are capable of accurately measuring the flow of corrosive strong acids or strong alkali liquids. Operating on the principle of Faraday’s law of electromagnetic induction, these inductive instruments determine the volumetric flow of conductive media within a tube. Apart from measuring the flow rate of standard conductive fluids, they also excel at measuring liquid-solid two-phase flows, high-viscosity liquids, as well as the volume flow of salts, strong acids, and strong alkali liquids. As a result, magnetic flow meters find extensive applications across various industries, including chemical, environmental protection, metallurgy, medicine, paper, and water supply and drainage.
In contrast, an ultrasonic flow meter measures flow by using sound waves and does not rely on the fluid being conductive.