Electromagnetic Flow Meter
An electromagnetic flow meter (often called a mag meter) is a device used to measure the flow rate of liquids—especially conductive fluids—using principles from Faraday's Law of Electromagnetic Induction.
How it works
When a conductive liquid (like water with minerals, wastewater, or chemicals) flows through a pipe inside the meter:
- A magnetic field is generated across the pipe.
- As the liquid moves through this field, it creates a small voltage.
- Electrodes in the meter detect this voltage.
- The voltage is directly proportional to the fluid’s flow velocity.
So essentially, faster flow = higher voltage = higher measured flow rate.
Common applications
- Water and wastewater treatment plants
- Chemical processing industries
- Food and beverage production
- Pharmaceutical manufacturing
Summary
- No moving parts → low maintenance
- Highly accurate for conductive liquids
- Works well with dirty, corrosive, or slurry fluids
- Not suitable for non-conductive liquids (like oil or distilled water)