ADMAG Sanitary Magnetic Flow Meters

Magnetic Flow Meter: How It Works

Electromagnetic flowmeters (magmeters) are among the most widely used flowmeter types today. If conditions are suitable for their use, magmeters produce superior results as they rely on a measurement principle that is non intrusive and produces no pressure loss. Magmeters may be used on all commercially available pipe sizes. Here's how magnetic flow meters work:

Magmeters consist of the following elements:

• Non ferromagnetic flowtube
• Non conductive liner
• Excitation coils
• Electrodes

The generated magnetic field is perpendicular to the fluid flow direction, allowing measurement of the electromotive force E, which, according to Faraday law of induction (Eflow~ B * v * D), is proportional to fluid flow velocity in the pipe. The overall merits of this design are obvious:

• There is no obstruction in the pipe and therefore no pressure drop caused by the magmeter.
• It works on all commercially available pipe sizes.
• The impact on measurement accuracy by flow disturbances in the media is negligible, thus require less upstream and downstream straight pipe run.