Electromagnetic Measurement
Uses electromagnetic induction for volumetric flow measurement of compatible conductive liquids.
Flow Meters
Electromagnetic Flow Meter
Accurate Flow Measurement for Conductive Liquids Without Moving Parts
Reliable Flow Measurement for Conductive Liquids
The FlowDo Electromagnetic Flow Meter measures volumetric flow using electromagnetic induction. Designed for compatible electrically conductive liquids, it provides reliable process-flow measurement without mechanical moving parts in the measuring tube.
ELECTROMAGNETIC
Principle
VOLUMETRIC FLOW
Measurement
NO MOVING PARTS
Flow Path
CONDUCTIVE LIQUIDS
Application
Product Overview
Electromagnetic Flow Measurement for Industrial Processes
The FlowDo Electromagnetic Flow Meter is designed to measure the volumetric flow rate of compatible electrically conductive liquids.
During operation, the fluid passes through a magnetic field generated across the measuring tube. As the conductive liquid moves through this field, a small electrical voltage is induced. Electrodes positioned in the measuring section detect this signal, and the transmitter electronics convert it into a corresponding flow value.
Because the measurement principle does not require mechanical moving elements in the flow path, electromagnetic flow measurement is well suited to many water, wastewater and industrial process applications.
Selection Guidance: Final meter selection should consider pipe size, flow rate, fluid conductivity, liner and electrode compatibility, temperature, pressure, process connection, output and installation conditions.
Key Engineering Highlights
- Non-intrusive electromagnetic volumetric flow sensing principle
- Completely unobstructed lined measuring tube with zero mechanical rotating parts
- Digital transmitter display for instantaneous rate and accumulated volume indication
- Standard 4–20 mA current output and compatible industrial automation interfaces
- Liner and electrode materials selected according to chemical and thermal compatibility
- Rugged flanged process connection engineered for demanding industrial pipelines
FLOWDO • MAG
148.5
m³/h • FLOW
Direct Reading
Instantaneous Flow Indication
High-contrast digital readout displays the instantaneous volumetric flow rate on-site in configurable engineering units.
Accumulation
Configurable Flow Totalization
Applicable converter configurations record cumulative fluid volume over time for operational tracking and water accounting.
Signal Output
Standard 4–20 mA DC Output
Transmits a calibrated proportional analog current signal for seamless integration with PLCs, panel indicators, and DCS systems.
Instrumentation Capabilities
Key Features
Engineered for dependable, high-accuracy industrial liquid metering.
No Moving Flow Elements
Measurement does not rely on mechanical rotating components in the measuring tube.
Continuous Flow Monitoring
Provides continuous volumetric-flow information with rapid dynamic response to flow variations.
Local Digital Display
Integrated front display delivers clear local reading of instantaneous flow and total volume.
Configurable Totalization
Tracks cumulative volume for batch verification, daily consumption, and billing management.
Process Signal Outputs
Standard 4–20 mA current loop and configurable digital outputs for automation integration.
Robust Industrial Housing
Built for industrial field conditions with high-grade protective enclosures and flanged connections.
Bidirectional Flow Sensing
Supported transmitter configurations accommodate forward and reverse flow direction tracking.
Operational Advantages
Built for Reliable Industrial Flow Measurement
Delivering measurable performance improvements for plant operators and instrumentation engineers.
Unobstructed Bore
The unobstructed measuring tube minimizes pressure drop and avoids mechanical rotor clogging.
Low Mechanical Wear
Without internal rotating parts, mechanical wear is minimized compared with mechanical velocity meters.
Direct Process Indication
The integrated digital display allows operating personnel to check instantaneous flow and total volume locally.
Standard Process Output
Standard 4–20 mA transmission facilitates straightforward integration with existing control loops and indicators.
Material Configuration
Available liner and electrode configurations can be selected according to supported process requirements.
Automation Integration
Compatible transmitter outputs can integrate with PLC and SCADA architectures for process automation.
Technical Configuration
Product Specifications
Comprehensive technical specification architecture for FlowDo Electromagnetic Flow Meters.
Brand / Manufacturer
FlowDo
Product Name
FlowDo Electromagnetic Flow Meter
Primary Category
Flow Meters
Product Type
Industrial Electromagnetic Flow Meter
Measured Parameter
Volumetric Flow Rate
Measurement Principle
Electromagnetic Induction (Faraday’s Law)
Nominal Diameter / Line Size
According to selected model / pipeline requirements
Flow Range
According to selected size and application
Velocity Range
According to selected model
Accuracy
According to selected model
Repeatability
According to selected model
Bidirectional Measurement
Available as per transmitter configuration
Minimum Conductivity Requirement
According to selected model and application
Empty-Pipe Detection
Available on selected FlowDo transmitter configurations
Display Type
Integrated Digital Display (standard compact configuration)
Instantaneous Flow Indication
Supported on digital display
Flow Totalization
Supported on configurable transmitter configurations
Configurable Display Units
Configurable as per selected transmitter model (e.g. m³/h, LPM, etc.)
Display Backlight
Supported on digital display
Analog Output
4–20 mA DC
Pulse / Frequency Output
Available as per transmitter configuration
Relay Output
Available on selected transmitter configurations
Digital Communication
RS485 / Modbus RTU / HART (configuration dependent)
Power Supply
According to selected configuration (e.g. 230 VAC / 24 VDC options)
Power Consumption
Model dependent
Cable Entry
Standard industrial conduit entries
Electrical Connection
Screw terminals inside transmitter junction housing
Liner Material
Selected according to process-medium compatibility
Electrode Material
Selected according to process-medium compatibility
Measuring Tube
Stainless steel measuring section with non-conductive liner
Sensor Body Material
Industrial coated carbon steel / stainless steel (model dependent)
Flange Material
Carbon steel / Stainless steel (model dependent)
Grounding Arrangement
Grounding electrode / grounding rings (application dependent)
Process Connection
Flanged (standard) / other supported configuration
Flange Standard
According to selected standard (e.g. ANSI / DIN / JIS / BS)
Pressure Rating
According to selected model / flange rating
Process Temperature
Model / material dependent
Ambient Temperature
According to selected transmitter model
Enclosure Protection Rating
According to selected model (e.g. IP65 / IP67 / IP68 options)
Process Fluid
Electrically conductive liquids according to material/application compatibility
Primary Application
Industrial Liquid Flow Measurement
Final Technical Specifications Note: Final specifications depend on the selected FlowDo Electromagnetic Flow Meter model, line size, and process application. For correct engineering selection, provide pipe size, flow range, process liquid, conductivity, temperature, pressure, process connection, and required output.
Application Engineering
Designed for Electrically Conductive Liquids
The electromagnetic measurement principle requires the process liquid to provide sufficient electrical conductivity for the electrodes to detect the induced signal.
SUITABLE CONCEPTUALLY
Conductive Liquid Medium
When an electrically conductive fluid flows through the field, continuous charge separation creates a clean electrical signal across the electrodes:
Conductive Liquid → Stable Induced Potential → Precise Flow Measurement
- ✓ Raw water, potable water, and municipal water supplies
- ✓ Industrial wastewater, sewage, and effluent streams
- ✓ Compatible aqueous chemical solutions and acids/alkalis
- ✓ Cooling tower circulating water and process utilities
NOT SUITABLE CONCEPTUALLY
Non-Conductive Media
Fluids without sufficient electrical conductivity cannot generate an induced signal detectable by standard measuring electrodes:
Non-Conductive Liquid → Insufficient Electrode Signal → Alternative Technology Required
- ✕ Hydrocarbons, diesel, petrol, and refined fuels
- ✕ Lubricating oils, hydraulic fluids, and mineral oils
- ✕ Industrial gases, compressed air, and steam
- ✕ Ultra-pure demineralized water with zero ion content
Conductivity Notice: Minimum conductivity requirements depend on the selected FlowDo meter and transmitter configuration. Always review fluid properties during model selection.
Flow Path Design
No Mechanical Moving Parts in the Measuring Tube
Electromagnetic flow measurement does not rely on a turbine, paddle or other mechanical rotor in the flow path.
The liquid passes cleanly through a smooth lined measuring tube while the external magnetic field and flush electrodes perform the measurement without protruding into the fluid stream.
Unlike mechanical velocity meters, there are no rotating rotors, bearings, or pivots subjected to wear, bearing seizure, or fiber entwinement.
No Mechanical Rotor
Zero moving parts in the liquid flow channel.
Minimal Flow Obstruction
Negligible hydraulic pressure loss across the meter body.
Engineering Advantages
- Eliminates mechanical rotor wear and bearing maintenance
- Suitable for compatible liquids containing suspended solids depending on liner/electrode selection
- Bi-directional measurement capability on supported transmitter architectures
- Unrestricted bore profile preserves pumping energy and pipeline pressure
Meter Construction
Inside an Electromagnetic Flow Meter
Key functional components comprising the sensor body and converter assembly.
01
Transmitter / Converter
Housed in a rugged enclosure, converts induced microvolt electrode signals into flow values and process outputs.
02
Digital Display
Clear front digital display for instantaneous flow rate and configurable flow totalization indication.
03
Measuring Tube
Non-magnetic tube providing an unobstructed passage for the process fluid.
04
Magnetic Coils
Electromagnetic field coils positioned above and below the tube to generate the measurement magnetic field.
05
Insulating Liner
Isolates the metallic tube and prevents short-circuiting of the induced signal across the pipe wall.
06
Measuring Electrodes
Positioned flush in the measuring section to detect the induced potential difference in the flowing liquid.
07
Process Flanges
Heavy-duty bolted flanges on both ends engineered to connect seamlessly to industrial process piping.
08
Grounding Arrangement
Provides an electrical reference between the process liquid and transmitter circuitry for signal stability.
Materials Engineering
Liner and Electrode Material Selection
Selecting wetted components around process chemistry, temperature, and operating conditions.
Wetted Boundary
Select the Liner for the Process Medium
The liner isolates the measuring tube from the process liquid and should be selected according to chemical compatibility, temperature, abrasion and process conditions.
Liner Selection Factor: Available liner materials depend on the selected FlowDo model and process compatibility. Share fluid type, operating temperature, and potential abrasive content for proper configuration.
Signal Pick-Up
Electrode Material Matters
The measuring electrodes contact the process medium and detect the induced flow signal. Their material must be compatible with the liquid and process conditions.
Electrode Factors: Corrosion resistance, fluid composition, and operating temperature determine electrode suitability. Selected according to process-medium compatibility.
Meter Sizing
Select the Correct Meter Size
Flow rate, velocity, and nominal bore size work together to achieve optimal measurement performance.
Flow Rate and Velocity Work Together
Electromagnetic flow meters determine liquid velocity within the measuring tube and convert it into volumetric flow using the known meter cross-sectional area:
LOW VELOCITY → Lower Flow Rate (for same diameter)
HIGH VELOCITY → Higher Flow Rate (for same diameter)
Recommended operating velocity depends on the selected FlowDo meter size and application. Meter size should be selected according to pipeline diameter, expected flow range and desired flow velocity.
Engineering Sizing Checklist
- Nominal pipe diameter of existing pipeline
- Minimum, normal, and maximum expected volumetric flow rates
- Desired fluid velocity within the measuring bore
- Pressure loss considerations across the overall piping system
- Flange standard matching existing pipeline flanges
Installation Engineering
Keep the Measuring Tube Full
For reliable electromagnetic flow measurement, the measuring electrodes should remain appropriately wetted.
✓ Optimal Condition
Stable electrode signal • Full cross-section velocity calculation
100% Completely Full Pipe
When the measuring tube is completely filled with conductive liquid, both electrodes maintain continuous, stable electrical contact across the full cross-sectional area.
FULL PIPE • 100% LIQUID CONTACT
✕ Condition to Avoid
Electrodes dry or unstable • Application review required
Partial Fill / Air Pockets
If air accumulates at the top of the tube or the pipe runs partially empty, electrodes may lose liquid contact, compromising volumetric measurement calculation.
AIR GAP / VAPOR POCKET
PARTIAL LIQUID LEVEL
Installation Notice: Actual installation requirements should follow the selected FlowDo model documentation. Pipes should be routed so that the meter remains flooded under normal operation.
Pipeline Layout
Orientation, Flow Conditions & Grounding
Key physical mounting practices for reliable electromagnetic measurement.
Orientation
Typical Installation Orientation
Meter orientation should be selected to maintain suitable measuring conditions and according to actual process/application requirements:
Horizontal: FLOW → [ MAG METER ] →
Vertical: ↑ UPWARD FLOW through meter
Vertical: ↑ UPWARD FLOW through meter
Hydraulics
Upstream & Downstream Flow
Disturbed flow caused by elbows, valves, pumps or other fittings can influence measurement conditions. Appropriate upstream/downstream installation should be selected according to the FlowDo meter specification and process layout.
Electrical
Proper Grounding Reference
Electromagnetic flow measurement requires an appropriate electrical reference between the meter and process liquid. Grounding requirements depend on pipeline material, meter construction and selected FlowDo configuration (e.g. grounding electrode or grounding rings).
Applications
Industrial Process Applications
Proven electromagnetic flow measurement across water, wastewater, utilities, and compatible process pipelines.
Water Treatment
Flow measurement in compatible raw water, municipal water-treatment and filtration pipelines.
STP / ETP Facilities
Conductive liquid flow monitoring in suitable sewage and industrial effluent-treatment processes.
Industrial Water
Process and utility-water flow monitoring across industrial plants and manufacturing skids.
Chemical Processing
Flow measurement only where liner and electrode materials are compatible with the chemical medium.
Cooling Water Circuits
Flow monitoring in compatible cooling tower return, condenser and heat exchanger lines.
Pumping Systems
Flow measurement in suitable pump discharge, intake and fluid transfer lines.
Water Distribution
Distribution network flow monitoring in compatible bulk supply and industrial utility lines.
Slurry & Suspended Solids
Only where the selected abrasion-resistant liner, electrode material and application support it.
Environmental Monitoring
Discharge flow verification and process liquid monitoring in environmental control systems.
Fluid Compatibility
Is Electromagnetic Flow Measurement Right for the Liquid?
Evaluating fluid suitability based on electrical conductivity and chemical characteristics.
Compatible Media
Suitable Conceptually
- ✓ Water: Potable, river, well, and utility water
- ✓ Wastewater: Municipal sewage, storm runoff, industrial effluent
- ✓ Aqueous Solutions: Salt water, brine, compatible acid/base solutions
- ✓ Other Conductive Liquids: Subject to material and conductivity requirements
Alternative Technology Required
Application Review Required
- ✕ Non-Conductive Hydrocarbons: Fuel oil, kerosene, gasoline
- ✕ Oils: Lubricating oils, transformer oils, hydraulic fluids
- ✕ Gases: Air, nitrogen, natural gas, biogas
- ✕ Steam: Saturated and superheated plant steam
Final Suitability Note: Final suitability depends on actual fluid conductivity, liner/electrode compatibility and selected meter specification. Contact FlowDo application engineering for assistance.
Technology Comparison
Electromagnetic or Turbine Flow Meter?
Choosing between no-moving-parts electromagnetic sensing and rotor-based turbine flow measurement.
Electromagnetic Flow Meter
- Principle
- Electromagnetic induction (Faraday's Law).
- Moving Parts
- No rotating measuring element in the measuring tube.
- Fluid Requirement
- Compatible electrically conductive liquids.
- Typical Selection Factors
- Conductivity, liner/electrode compatibility, pipe size, flow range, low pressure loss.
Turbine Flow Meter
- Principle
- Flow-driven rotor / turbine mechanical rotation.
- Moving Parts
- Yes, multi-blade mechanical rotor in fluid path.
- Fluid Requirement
- Depends on turbine design/application (typically clean liquids or gases).
- Typical Selection Factors
- Fluid cleanliness, viscosity, range, pressure, mechanical conditions.
Technology selection depends on the fluid, flow range, pipe size, required accuracy, pressure, temperature and process conditions.
Acoustic vs Induction
Electromagnetic or Ultrasonic Flow Measurement?
Comparing electromagnetic induction with ultrasonic acoustic transit-time measurement.
Electromagnetic Flow Meter
- Principle
- Electromagnetic induction.
- Medium
- Compatible conductive liquids.
- Pipe Interaction
- Inline measuring tube in common flanged configurations.
- Moving Parts
- No mechanical moving elements.
Ultrasonic Flow Meter
- Principle
- Ultrasonic sound wave propagation / transit time.
- Medium
- Depends on ultrasonic technology and application.
- Installation
- Inline or clamp-on depending on product architecture.
- Moving Parts
- No moving parts in measuring channel.
Neither technology is universally better. Selection depends on medium properties, pipe size, installation requirements, accuracy, process conditions and maintenance considerations.
Telemetry Architecture
Electromagnetic or Telemetry Flow Meter?
Clarifying the relationship between base electromagnetic sensing and connected telemetry monitoring.
Electromagnetic Flow Meter
- Core Purpose
- Accurate volumetric flow measurement and on-site process indication.
- Telemetry
- Depends on transmitter/system configuration and interfaced gateway.
- Primary Role
- Dedicated pipeline primary element with standard 4–20 mA output.
Digital Flow Meter With Telemetry
- Core Purpose
- Flow measurement + integrated remote data transmission.
- Telemetry
- Integrated/configured remote monitoring capability communicating with cloud dashboards.
- Primary Role
- End-to-end monitoring solution for remote audits and compliance logging.
Rate & Accumulation
Instantaneous Flow and Totalized Volume
Configurable transmitter models support continuous tracking of momentary rate and cumulative volume.
Rate Indicator
Flow Rate
Current momentary volumetric flow rate value (for example: m³/h, LPM, etc., according to actual configurable transmitter units). Reflects immediate operational conditions in real time.
Totalizer
Flow Totalizer
Accumulated volume over time, essential for water budgeting, batching, billing verification, and compliance records. Preserved across power interruptions on supported transmitter memory.
FLOW RATE (m³/h)
→ TOTALIZATION →
ACCUMULATED VOLUME (m³)
System Integration
From Pipeline Flow to Process Monitoring
Seamless signal transmission from field meter into control panels and telemetry architecture.
FlowDo Electromagnetic Flow Meter
Conductive Liquid Flow • Full-Bore Sensing
↓
Local Digital Indication & Signal Converter
Instantaneous Flow Display • Totalized Volume (where configured)
↓
Supported Output Interface
4–20 mA Analog DC / Configurable Pulse / RS485 Modbus
↓
Local Process Indicator
FlowDo FDI-96 Digital Flow Indicator / Panel Meter
PLC / Plant Controller
Process Logic, Dosing Controls & Interlocks
↓
SCADA & FlowDo Telemetry Platform
Centralized plant dashboards, reports, history & remote alerts
Product Configuration
Configure the Electromagnetic Flow Meter for Your Application
Define key engineering parameters to select the appropriate FlowDo meter model and materials.
Pipe Size
Actual nominal pipeline diameter and internal bore dimensions.
Flow Range
Minimum, normal, and maximum expected volumetric flow rates.
Process Liquid
Fluid name, electrical conductivity, viscosity, and chemical composition.
Liner Material
Selected according to chemical compatibility and operating temperature.
Electrode Material
Selected according to corrosion resistance and medium compatibility.
Temperature & Pressure
Maximum operating process temperature and line pressure rating.
Process Connection
Flange standard (e.g. ANSI, DIN) matching existing piping.
Power & Output
Power supply (230 VAC / 24 VDC), 4–20 mA, pulse, or digital communication.
Instrumentation Ecosystem
Related Flow & Process Instruments
Explore complementary FlowDo instruments that pair with the Electromagnetic Flow Meter.
Digital Flow Indicator
FDI Series Panel-mounted digital process indicator for displaying instantaneous flow rates and totalized volume from compatible 4–20 mA flow meters.
View details & specs →
Digital Process Indicator
Programmable panel-mounted indicator for monitoring industrial process variables from standard analog transmitter signals.
View details & specs →
Hydrostatic Level Transmitter
Model FLD-HLT Submersible hydrostatic level transmitter for liquid-level measurement in storage tanks, reservoirs, and sumps.
View details & specs →Frequently Asked Questions
Electromagnetic Flow Meter FAQs
Answers to common engineering questions regarding electromagnetic liquid metering.
What is an electromagnetic flow meter?
An electromagnetic flow meter measures the volumetric flow of compatible conductive liquids using electromagnetic induction.
How does it measure flow?
As conductive liquid moves through the meter's magnetic field, an electrical voltage is induced. The electrodes detect this signal, and the transmitter converts it into a corresponding flow value.
Does an electromagnetic flow meter have moving parts?
The electromagnetic measurement principle does not require a mechanical rotor or turbine in the measuring tube.
Can it measure water?
Water applications are commonly compatible with electromagnetic flow measurement when the liquid conductivity and selected meter configuration meet the required specifications.
Can it measure oil?
Many oils are not sufficiently electrically conductive for standard electromagnetic flow measurement. Actual liquid conductivity should be reviewed before selecting the technology.
Can it measure gas or steam?
Standard electromagnetic flow meters are intended for conductive liquids and are not normally used to measure gases or steam.
Why does conductivity matter?
The meter relies on electrical interaction between the moving liquid and measuring electrodes, so the process liquid must have sufficient conductivity for the selected meter.
What liner should I select?
Liner selection depends on chemical compatibility, temperature, abrasion and process conditions. Available liner materials depend on the selected FlowDo model.
Why do electrode materials matter?
The electrodes contact the process liquid and must be compatible with the medium and operating conditions.
Can it provide 4–20mA output?
4–20 mA is standard on supported FlowDo transmitter configurations for interfacing with industrial indicators and control systems.
Does it support RS485 / Modbus?
Digital communication should be listed only where confirmed for the selected FlowDo transmitter configuration.
Does it have a totalizer?
Totalization is presented for configurations where the FlowDo transmitter specification confirms this functionality.
Can it connect to PLC or SCADA?
Yes, when the selected meter output or communication interface is compatible with the PLC/control-system architecture.
Can it connect to FlowDo IoT Cloud?
FlowDo IoT Cloud integration can be configured where a compatible telemetry or interface gateway configuration has been confirmed.
How do I select the correct meter size?
Provide the pipeline size, minimum/normal/maximum flow, process liquid, conductivity, temperature, pressure and connection requirements.
Need Help Selecting a Flow Meter?
Configure the Right Electromagnetic Flow Meter for Your Process
Share your pipe size, flow range, process liquid, conductivity, temperature, pressure, process connection and required output with FlowDo to identify a suitable electromagnetic flow meter configuration.
For faster selection, provide: Pipe Size • Minimum Flow • Normal Flow • Maximum Flow • Process Liquid • Conductivity • Temperature • Pressure • Process Connection • Required Output