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How electromagnetic flowmeters work

Electromagnetic flowmeters, or mag flowmeters, are incredibly useful devices for controlling precision dosing operations and flow measurement applications. Here, Bürkert answers frequently asked questions regarding mag flowmeters, including: what electromagnetic flowmeters are, how do they work, their advantages and common applications.

What is an electromagnetic flowmeter?

Electromagnetic flowmeters use Faraday’s Law to determine the flow of liquid in a pipe. Whereby, the flow of a conductive liquid through the magnetic field causes a voltage signal to be sensed by electrodes located on the flow tube walls. The voltage generated is proportional to the movement of the flowing liquid. In other words, the faster the fluid flows, the more voltage is generated. The electromagnetic flowmeter therefore processes the voltage signal to determine liquid flow.

How an electromagnetic flowmeter works


How an electromagnetic flowmeter works depends on the type that you select. Here at Bürkert, we have two types of EMF available: Insertion or Full Bore. Our line of insertion electromagnetic flowmeters include the Type 8041 and Type 8045. Both are made up of an electronic module and a PVDF or stainless steel sensor to measure a flow rate of neutral and slightly aggressive fluids with a conductivity of more than 20 µS/cm in DN06...DN400 pipes.

Our full bore electromagnetic flowmeters include the Types 8051, Type 8054, Type 8055 and Type 8056. These mag flowmeters consist of a magnetic sensor fitting connected to an electronics type and are designed to give flow measurement readings for applications involving liquids with a minimum conductivity of 5 μS/cm.

Advantages of electromagnetic flowmeters


There are many advantages of electromagnetic flowmeters like the Type 8041 and 8045. These insertion EMFs feature sensors without moving parts, are manufactured from FDA compliant materials and are suitable for Clean in Place applications. Both are available with G2” connections for PVDF sensor versions and a further clamp connection option for stainless steel sensor versions.

All of our full bore electromagnetic flowmeters offer a complete solution for continuous measurement or batch control, for use in applications ranging from water treatment to hygienic food and beverage or pharmaceutical applications. Combined with a valve as the actuating element, these versatile mag flowmeters are ideal for controlling high-precision dosing operations and flow measurement.

Applications of electromagnetic flowmeters


There are a number of applications of electromagnetic flowmeters in the Bürkert range. The Type 8041 version with a stainless steel sensor can be used in applications with high pressures of up to PN16 and high temperatures of up to 150°C. While the Type 8045 version with a stainless steel sensor can be used in applications with the same high pressures (PN16) it is limited to higher temperatures of 110°C, due to an integrated LCD display. Furthermore, the Type 8045 with Alloy C22 electrodes has been designed for applications with aggressive fluids (chemicals) and especially sea water applications.

Within our full bore mag flowmeter range, the Type 8051 is a full bore mag flowmeter for low flow volumes, which is suited to Clean in Place (CIP) applications. Whereas, Type 8054/8055 full bore mag flowmeters are designed for water treatment and general purpose applications. Combined with an actuated valve, the complete full bore mag flowmeter Type 8056 can control high-precision dosing operations and flow measurement in food and beverage or pharmaceutical applications. 

If you'd like more information, please contact our team on +44 1285 648 720, email or fill in the form below.