The electromagnetic flow meter is an advanced electronic flow measurement device based on Faraday’s Law, and its working principle is that a conductive liquid passing through a magnetic field generates voltage proportional to flow velocity. If you’re wondering how does an electromagnetic flow meter work, or asking what is the working principle of electromagnetic flow meter, it’s all about magnetic fields, induced voltage, and non-intrusive measurement. The electromagnetic flowmeter diagram shows magnetic coils, electrodes, and a transmitter — making it easy to understand the electromagnetic flowmeter principle. For accurate, real-time flow monitoring, especially in water systems, the electromagnetic water flow meter is widely used. Still confused about what is electronic flow meter? It’s a modern solution using electronic sensing and display, including ultrasonic flow meter types that work on sound wave technology — ideal for non-conductive fluids. When trading globally, knowing the electromagnetic flowmeter HS code (typically 902610) ensures smooth customs clearance. Like every device, there are electromagnetic flow meter advantages and disadvantages: they offer high accuracy and zero pressure drop but only work with conductive liquids. In essence, whether you’re looking to understand any flowmeter option, from electromagnetic to ultrasonic, Aaxis Nano provides complete, reliable, and customized solutions tailored to your industrial needs — from selection to installation.
What Is an Electromagnetic Flow Meter?
An electromagnetic flow meter (magmeter) is an industrial device used to measure the volumetric flow rate of conductive fluids, including water, acids, slurries, and other liquids with electrical conductivity. It is widely used in industries such as water treatment, food and beverage, chemical processing, mining, and pharmaceuticals.
Electromagnetic Flow Meter Working Principle Explained
The working principle of an electromagnetic flow meter is based on Faraday’s Law of Electromagnetic Induction. According to this law:
“When a conductive fluid flows through a magnetic field, it induces a voltage proportional to the velocity of the fluid.”
This induced voltage is measured by electrodes, and the flow rate is calculated accordingly. The equation is:
E = kBDV,
where:
- E = Induced voltage
- k = Constant
- B = Magnetic field strength
- D = Diameter of the pipe
- V = Flow velocity
How Does an Electromagnetic Flow Meter Work?
Here’s a step-by-step of how an electromagnetic flow meter works:
- Magnetic coils inside the sensor generate a magnetic field.
- The conductive fluid passes through this field.
- Electrodes placed perpendicularly to the field and flow direction detect the induced voltage.
- The transmitter interprets this voltage and displays the flow rate.
- No moving parts ensure reduced maintenance and high reliability.
Electromagnetic Flowmeter Principle with Diagram
The electromagnetic flowmeter diagram typically includes:
- Magnetic coils – create the magnetic field
- Flow tube – through which fluid flows
- Electrodes – sense voltage from fluid movement
- Signal converter/transmitter – translates signal into a readable flow value
This setup enables precise, real-time flow measurement with minimal energy loss.
Electromagnetic & Ultrasonic Flow Meter Products
1️⃣ AX-EMF Series – Electromagnetic Flow Meter
Description:
A robust, industrial-grade flow meter designed for high-accuracy measurement of conductive liquids.
Key Features:
- Based on Faraday’s Law of Electromagnetic Induction
- No moving parts – ideal for slurries, wastewater, and corrosive chemicals
- Accuracy up to ±0.5% of reading
- Available sizes: DN15 to DN1000
- Output: 4-20 mA, RS485 Modbus, Pulse
- Power supply: 24V DC or 230V AC
- IP65/IP68 Protection for outdoor/underground installations
Applications:
Water treatment, chemical dosing, food & beverage, pulp & paper, mining slurries
2️⃣ AX-ULF Series – Ultrasonic Flow Meter (Clamp-On & In-Line)
Description:
A non-intrusive flow meter that uses ultrasonic wave technology to calculate flow rate in both conductive and non-conductive fluids.
Key Features:
- Clamp-on and in-line models available
- Works with clean liquids, oils, and even gases
- Accuracy: ±1% of reading
- Non-invasive installation—no pipe cutting required
- Data logging and Bluetooth connectivity (optional)
- Portable version available for spot measurements
Applications:
HVAC, chilled water lines, oil and gas, water distribution, retrofitting legacy systems
3️⃣ AX-WFM – Electromagnetic Water Flow Meter
Description:
Customized for municipal and industrial water flow monitoring. Built for long-term durability in harsh field conditions.
Key Features:
- Special calibration for potable and raw water
- Rugged design with anti-corrosive liners
- Accuracy: ±0.2% to ±0.5%
- Optional GSM/IoT module for remote monitoring
- Available with battery-operated models for remote locations
- Built-in display with totalizer and real-time flow
Applications:
Irrigation, water supply boards, sewage monitoring, agriculture, smart city projects
4️⃣ AX-FMS Smart Flow Monitoring System
Description:
A complete flow monitoring and data acquisition system integrated with SCADA/PLC for automation.
Key Features:
- Real-time cloud sync via GSM/Wi-Fi
- Multi-sensor input compatibility (EMF, UFM, pressure sensors)
- Web and mobile dashboard
- Alerts for leak detection, flow thresholds, and device health
- Supports custom reporting and API integrations
Applications:
Smart factories, water networks, chemical processing plants, energy audits
⚙️ Accessories & Add-Ons
- Remote Display Units – up to 30 meters away
- Data Loggers – SD card or online logging
- GSM/IoT Modules – cloud connectivity for remote areas
- Custom Flanges & Fittings – for high-pressure applications
- Solar Power Kits – for battery-powered remote use
Electromagnetic Flowmeter HS Code – For International Trade
The HS code (Harmonized System code) for electromagnetic flow meters is generally classified under 902610, which stands for:
“Instruments and apparatus for measuring or checking the flow or level of liquids.”
This classification is vital for:
- Import/export documentation
- Customs clearance
- GST/Taxation categorization
Advantages and Disadvantages of Electromagnetic Flow Meters
✅ Advantages
- No moving parts, meaning less wear and tear.
- Accurate measurements even with turbulent or dirty fluids.
- No pressure loss, since the flow path is unobstructed.
- Suitable for large pipe diameters.
- Compatible with corrosive and abrasive media.
❌ Disadvantages
- Can only measure conductive liquids (minimum ~5 µS/cm).
- Not suitable for hydrocarbons, oils, or gases.
- Needs power supply for operation.
- Generally higher cost than mechanical meters.
✅ Why Choose Aaxis Nano?
At Aaxis Nano, we do not provide training courses, but we offer end-to-end industrial solutions, including:
- Supply and installation of electromagnetic and ultrasonic flow meters
- Custom-built flow solutions based on your industry
- Post-installation support and troubleshooting
- Compliance assistance (including HS codes and documentation)
- Expert consultation on selecting the right technology
🎯 Let us help you measure better, smarter, and more reliably.
Contact Aaxis Nano today for tailored flow meter solutions!
