Magnetic Flow Meters

Mag meters provide highly accurate flow measurement for a wide variety of conductive fluid applications.

Advantages of Magnetic Flow Meters

Magnetic flow meters, also known as electromagnetic flow meters or mag meters, are often selected because they are obstruction less, cost-effective, bi-directional, and provide highly accurate volumetric flow measurement. A range of liner materials, electrode options and line sizes accommodate a wide variety of process applications. For aggressive high noise applications, look to our Slurry Platform for optimum performance.  See if a Slurry mag meter meets your needs, visit us here.

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How It Works

Flow Measurement

Electromagnetic flow meters, or magmeters, are comprised of a transmitter and sensor that together measure flow. The magnetic flow meter’s sensor is placed inline and measures an induced voltage generated by the fluid as it flows through a pipe. The transmitter takes the voltage generated by the sensor, converts the voltage into a flow measurement and transmits that flow measurement to a control system.

Induced Voltage

A magmeter utilizes a set of coils and a pair of electrodes for flow measurement. The meter’s coils are driven by the transmitter with an applied current. Once powered, a magnetic field is formed between both coils. When the pipe is full and the fluid begins to flow, the force of the magnetic field causes the negatively and positively charged particles of the fluid to separate as they pass through the magnetic field. This separation causes an induced voltage between the electrodes and sensor.

Faraday’s Law

The flow principle behind magnetic flow meters is known as Faraday’s Law, mathematically defined as E=k*B*D*V. The induced voltage (E) is directly proportional to the velocity (V) of the fluid moving through the magnetic field (B). The induced voltage is carried to the transmitter through the electrode circuit. The transmitter then converts this voltage into a quantifiable flow velocity. The volumetric flow rate of the fluid is calculated using this known velocity along with the area of the pipe.

Common Uses

Magnetic flow meters are well suited for a variety of applications across a range of industries including pulp and paper, metals and mining, water and wastewater, food and beverage, chemical and petrochemical and oil and gas. Because the magnetic flow meter design does not leave any protrusions or obstructions in the pipe, they are able to accommodate an array of applications from clean and sanitary liquids to slurries and highly corrosive or abrasive fluids.

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Magnetic Flow Meter