Electromagnetic Flow Meter

The working principle of electromagnetic flow meter is based on the law of induction by Faraday, which helps it measure flow without having an obstruction within the pipeline itself. This way, there is zero pressure loss, and there is no effect on the flow rate.

This flow meter is a full bore type and hence is useful in measuring corrosive fluids, slurry, and wastewater. It has been designed in such a way that its maintenance requirement is minimal.

These types of meters are mostly used when accurate and consistent measurements are required.

• Measures the flow of electrically conductive liquids.
• No moving parts for maintenance-free operation.
• Negligible pressure drop due to unobstructed flow tube.
• Performance is unaffected by density, viscosity, temperature, and pressure.
• Suitable for clean liquids, slurries, sewage, wastewater, and corrosive chemicals.
• Integral LCD display for flow rate and totalizer indication.
• Supports 4–20 mA, Pulse, and RS485 Modbus communication.
• High and low flow alarm with relay output.
• Fast response to changing flow conditions.
• Available with PTFE and Neoprene lining options for different applications.

• Fluid: Conductive Liquids
• Specific Gravity: Up to 2.95
• Viscosity: Up to 3000 cP
• Design Pressure: Up to 15 Kg/cm²
• Measuring Range: 0.1 to 350 m³/hr
• Velocity Range: 0.5 m/s to 10 m/s

Creation of Magnetic Field

A steady magnetic field can be created by placing electromagnetic coils around the flow tube. In order to measure the flow of conductive fluids, a magnetic field is required.

Flow of Conductive Fluid

On flowing of the conductive fluid such as water, chemicals or wastewater into the magnetic field, the fluid acts like a conductor of electricity. The meter utilizes this fact in measuring the velocity of the fluid.

Generation of Voltage (Faraday’s Law)

The motion of the conductive fluid into the magnetic field creates a small voltage. In accordance with the principle of Faraday’s law, the voltage is directly proportional to the flow rate but not the density and viscosity of the liquid.

Detection of Signal

The generated voltage is measured by the electrodes which are housed inside the lined flow tube. Because there are no moving parts in the pipeline, the meter works without any pressure loss.

Size & Flow Configurations

• Line Sizes: Scalable configurations available from 15 NB up to 300 NB (with options extending up to 600 NB for high-capacity systems) to accommodate diverse pipeline diameters.
• Full Bore Architecture: Designed as a full bore magnetic flow meter with a completely unobstructed flow path, ensuring zero obstruction and negligible pressure drop.
• Measuring Range Capacities: Volumetric fluid measurement handling capacities from 0.1 to 350 M3/hr.
• Velocity Range Limits: Configured to accurately capture fluid velocity profiles traversing from 0.5 m/s to 10 m/s.

Lining & Material Options

• Flow Tube Construction: Built using rugged, non-magnetic SS304 or SS316 stainless steel to eliminate external magnetic field interference.
• PTFE (Teflon) Lining: High-performance option offering chemical compatibility with a high temperature resistance up to 150 DegC / 180˚C; engineered as an electromagnetic flow meter for corrosive chemicals, ETP water, and solvents.
• Neoprene Lining: Specialized wear-resistant selection rated for weak acids, general alkaline environments, and standard utilities up to 80˚C.
• EPDM/Rubber Lining: Highly resilient elastomeric option optimized as an electromagnetic meter for water and general industrial applications.
• Electrode Metallurgy Options: Custom configurations utilizing SS316, Hastelloy C, Titanium, or Monel to match precise chemical properties and prevent surface coating or corrosion.

End Connections & Mounting

• Flanged Ends: Heavy-duty flange mountings manufactured to comply with ASA, BS, DIN, and JIS international dimensional piping standards.
• Enclosure Specifications: Housed in a die-cast aluminum weatherproof enclosure designed for seamless outdoor mounting and harsh industrial environments.

Process & Medium Parameters

• Conductivity Requirement: Designed specifically for highly conductive fluids with a minimum conductivity threshold of 5 µs/cm.
• Viscosity Limits: Capable of handling dense fluids and viscous chemical solutions up to 3000 cP.
• Slurry Optimization: Configured with robust lining protectors to serve as an electromagnetic flow meter for slurry measurement, handling heavy abrasives, sludge, sewage, and effluent wastewater.
• Design Pressure Ratings: Mechanical assembly rated to withstand standard operating pressures up to 15 Kg/cm2.

Electronic Modules & Display

• Microprocessor Controller: Integrated head-type digital electromagnetic flow meter transmitter containing an advanced microprocessor chip.
• LCD Display Interface: High-visibility 5-digit LCD showing instantaneous flow rate paired with a 10-digit LCD totalizer for tracking cumulative volume metrics.
• Primary Power Configurations: Universal electronics supporting 24 VDC or 230 VAC / 220 VAC external power lines.
• Smart Diagnostics: Pre-configured with an automated empty-full pipe check routine to prevent false volumetric tracking.

Output Signals & Process Automation

• Analog Output Module: Standard isolated 4-20mA current loop signal output (with optional HART protocol) for direct interfacing with DCS, PLC, or BMS infrastructure.
• Pulse Output: High-speed frequency pulse module for precision remote batching setups.
• Process Alarms: Dual-relay outputs assigned for customizable High and Low flow alarm trigger points.
• Digital Communication: Optional RS485 Modbus RTU serial data bus integration facilitating direct automated data logging over computer interfaces.

Unobstructed Flow through Full Bore Design: This flowmeter makes use of full bore design that does not involve any obstruction in the path of conductive fluids flowing through it.

Minimal Maintenance: Since the measuring tube of the flow meter does not have any moving parts, it reduces the mechanical wear and tear and thus requires minimal maintenance.

Designed for Extreme Environments: PTFE lining and Hastelloy electrodes are available for the magnetic flow meters to be used in environments dealing with water, waste water, slurries, and corrosive substances.

Consistent and Precise Measurements: Since the measurement of flow is done by means of electromagnetic process, there is very little impact of any change in fluid properties such as density, viscosity, pressure, and temperature.