What Media Are Electromagnetic Flow Meters Suitable For?

Electromagnetic flow meters are suitable for measuring the flow of electrically conductive liquids. The basic working principle is based on Faraday’s law of electromagnetic induction, which requires the measured medium to have a minimum electrical conductivity, typically ≥ 5 μS/cm.

Suitable Media

Electromagnetic flow meters are widely used for the measurement of the following types of liquids:

1. Water and Wastewater

   • Drinking water

   • Industrial water

   • Sewage and wastewater

   • Sludge and activated sludge

2. Liquids Containing Solids or Particles

   • Slurries

   • Mud, sand-water mixtures

   • Mineral pulp

   • Paper pulp and fiber suspensions

3. Chemical and Corrosive Liquids

   • Acids (e.g. sulfuric acid, hydrochloric acid)

   • Alkalis (e.g. sodium hydroxide)

   • Salt solutions and electrolytes

   • Various chemical process liquids

4. Food and Beverage Liquids

   • Milk

   • Juice

   • Beer and wine

   • Syrups and other conductive food liquids

5. Other Industrial Liquids

   • Cooling water

   • Circulating water

   • Process water in power plants, metallurgy, and chemical industries

Media That Are NOT Suitable

Electromagnetic flow meters cannot measure non-conductive media, including:

• Oils and petroleum products

• Organic solvents

• Deionized or distilled water with extremely low conductivity

• Gases, steam, and compressed air

Additional Considerations

• The pipe must be completely filled with liquid during measurement.

• Excessive air bubbles may affect measurement stability.

• Proper selection of liner and electrode materials is essential to ensure compatibility with the measured medium and to guarantee long-term reliability.