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Electromagnetic flowmeter specification

All electromagnetic flowmeters operate according to the principles of Faraday’s law, which dictates the relationship between a moving conductor and the voltage it creates within a magnetic field. With a range of magnetic flowmeters available, each specifically suited to different operating conditions, it is imperative to ensure the correct electromagnetic flowmeter specification for your application.

Factors to consider when specifying an electromagnetic flowmeter include cost, accuracy, conductivity of media, installation conditions, flow velocity, ease of use and the following practicalities.

Hazardous Environments

 

Electromagnetic flowmeters can often be used to measure flow rates in hazardous environments. The Bürkert Type 8045 electromagnetic flowmeter, for example, is available with a stainless steel sensor, which makes it suitable for applications involving higher pressures (PN16) and higher temperatures (110°C). Our version with Alloy C22 electrodes has been specially designed for applications involving aggressive fluids (chemicals) and sea water applications.

Size and Capacity

 

The size and capacity of an electromagnetic flowmeter affects its processing capabilities and the velocity range that it can handle. Most electromagnetic flowmeters feature a meter size of 15 to 200 millimetres and a velocity range between 0.3 to 10 meters per second. The larger a flowmeter’s size, the higher its velocity capacity and the greater the flow rate it can measure. Our mag flowmeters range in size, from the low flow volume Type 8051 full bore mag flowmeter, which is ideal for high-precision dosing and filling operations, to the Type 8054/8055 full bore mag fllowmeter for water treatment and general purpose applications.

Pipe Design

Installation of electromagnetic flowmeters is easier when applied to circular piping than to rectangular pipe networks because they offer more effective measurements. In straight piping situations, upstream and downstream requirements often differ according to the type of flowmeter. The straight section of a pipe should be a designated distance from the electrodes and the flowmeter face; in both upstream and downstream flow. The Type 8045 is available with G2” process connections (DN06...DN400) or clamp connections (DN32...DN100), depending on the specified sensor material.

Electromagnetic flowmeter advantages and disadvantages

Advantages:

  • There is no pressure loss.
  • No moving parts, which improves reliability.
  • Unaffected by temperature, pressure, density or viscosity of the liquid.
  • Able to detect liquids that include contaminants (such as solids or air bubbles).         

Disadvantages:

  • Cannot detect gases and liquids without electrical conductivity.
  • A section of straight pipe is required.

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

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