Electromagnetic Flowmeter
Product Overview
An Electromagnetic Flowmeter (often called a Magmeter) is a flow measurement device used to measure the flow of electrically conductive liquids. It operates based on Faraday’s Law of Electromagnetic Induction, where a voltage is generated when a conductive fluid flows through a magnetic field. Because there are no moving parts and no obstruction in the flow path, electromagnetic flowmeters provide high reliability, low maintenance, and excellent long-term accuracy. They are widely used in water, wastewater, chemical, food & beverage, and industrial process applications.
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How it works (simple explanation)
- The flowmeter generates a magnetic field across the pipe using electromagnetic coils.
- As the conductive liquid flows through this magnetic field, it induces a voltage.
- Electrodes mounted in the pipe wall detect this voltage.
- The induced voltage is directly proportional to the fluid velocity.
- The transmitter converts this signal into flow rate and totalized volume.
What it measures
- Volumetric flow rate (e.g., m³/h, L/s, GPM)
- Totalized volume
- Suitable only for conductive liquids (typically ≥5 µS/cm conductivity)
- They cannot measure:
- Gases or steam
- Non-conductive liquids (e.g., oils, hydrocarbons, solvents)
Key advantages
- No moving parts → minimal wear and maintenance
- No pressure loss (full-bore, obstruction-free design)
- High accuracy and repeatability
- Insensitive to fluid density, viscosity, and temperature
- Handles dirty, corrosive, and slurry fluids
- Bi-directional flow measurement
- Works well at very low flow velocities
- Wide range of liner and electrode material options
Applications
- Water & wastewater – potable water, sewage, sludge
- Chemical industry – acids, bases, corrosive liquids
- Food & beverage – milk, juice, beer, CIP/SIP systems
- Pulp & paper – stock, black liquor
- Mining & minerals – slurry and abrasive liquids
- Pharmaceuticals – conductive process liquids
- HVAC & utilities – chilled and cooling water
Installation
- The pipe must always be completely full
- Install with proper grounding/earthing rings
- Avoid air pockets; install vertically with upward flow when possible
- Provide straight pipe runs. Typically, 5× DN upstream, 3× DN downstream
- Ensure correct electrode orientation (horizontal plane for liquids with solids)
- Choose correct liner and electrode materials based on fluid compatibility
- Proper electrical wiring and shielding are essential
Technical Specifications
Parameter | Specification |
Measurement Principle | Electromagnetic (Faraday’s Law) |
Measured Media | Conductive liquids only |
Minimum Conductivity | ≥ 5 µS/cm (some models ≥ 1 µS/cm) |
Flow Velocity Range | 0.01 to 10 m/s |
Accuracy | ±0.2% to ±0.5% of reading |
Repeatability | ±0.1% |
Pipe Sizes | DN 3 to DN 3000 |
Operating Pressure | Up to PN 40 / ANSI Class 300 |
Operating Temperature | –20 °C to +180 °C (liner dependent) |
Liner Materials | PTFE, PFA, rubber, polyurethane |
Electrode Materials | Stainless steel, Hastelloy, Titanium, Platinum |
Output Signals | 4–20 mA, pulse, HART, Modbus, Profibus |
Power Supply | AC or DC (battery-powered options available) |
Installation | Full-bore inline or insertion type |