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Electromagnetic Flowmeters
he materials included in this compilation are for the use of Dwyer Instruments, Inc. potential customers and current employees
www.hvac.vn
as a resource only. They may not be reproduced, published, or transmitted electronically for commercial purposes.
Furthermore, the Company’s name, likeness, product names, and logos, included within these compilations may not be used
Overview
Principles of Operation
Types of Electromagnetic Flow Sensors
Insertion
In-line
Installation Accessories
Rate and Totalizers
Analog Transmission
Target Markets
Application Photos and Uses
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Overview
Insertion
Adjustable
LOFM
MFS
IEFS
Fixed
MFS2
EFS2
In-line
IEFS
Small
LOFM & MFS/MFS2
Large
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FLMG
FLMG
EFS2
Principle of Operation
Faraday’s Law
Conductive liquid
moving through
a magnetic field
produces a
current
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Principle of Operation
Current is
proportional to
velocity of the
liquid
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Principle of Operation
A magnetic field is
directed through the
conductive liquid
Voltage generated is
proportional to the
movement of the
flowing liquid
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IEFS - Introduction
Adjustable, insertion electromagnetic flow meter
Designed for pipe sizes from 3 to 48˝
( 76 to 1219 mm)
Comes in different materials
Stainless steel and brass
Purchase by size and material
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IEFS - Specifications
Service: Compatible clean or dirty non-coating,
conductive liquids
Range: 0.28 to 20 ft/s (0.08 to 6.09 m/s)
Accuracy: ±1% FS
Output: Current sinking, square wave
pulse, opto-isolated, 550 Hz @ 20 ft/s
Enclosure Rating: NEMA 4X (IP66)
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IEFS - Features
Field adjustability allows for quick ship and
installation time
Brass and stainless steel materials of
construction
Versatility for higher temperature and
pressures and varying fluids
Reverse flow output option
Allows meter to indicate flow in two
directions, forward or reverse
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IEFS - Features
NPT or Hot-Tap process connection
Hot-Tap option allows for service of system without
draining process fluid
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EFS2 - Introduction
Electromagnetic flow meter
Fixed insertion depth
1 to 12” (25 to 305 mm)
PVC, Brass, and Stainless Steel
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EFS2 - Specifications
Service: Compatible clean or
dirty non-coating, conductive liquids
Range: 0.28 to 20 ft/s (0.08 to 6.09 m/s)
Accuracy: ±1% FS
Output: Current sinking, square wave
pulse, opto-isolated, 550 Hz @ 20 ft/s
Enclosure Rating: NEMA 4X (IP66)
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EFS2 - Features
Fixed depth
3 models allow for range of pipe sizes
1 to 3” (25 to 76 mm)
4 to 10” (102 to 254 mm)
12” (305 mm)
PVC, Brass, and Stainless Steel Materials of Construction
Versatility for higher temperature and pressures
Higher chemical compatibility for varying fluids
Reverse flow output option
Allows meter to indicate flow in two directions, forward or
reverse
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EFF Fittings
Series EFF fittings and tees required for
installation
Stainless Steel, Bronze, and PVC fittings and tees
allow for installation in virtually all applications
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Advantages and Disadvantages
IEFS2 – Adjustable
NPT and Hot Tap
Mount
One model for pipes
3 to 24” (76 to 607
mm)
Higher Cost
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EFS2 - Fixed
Lower Cost
Operational in pipes
down to 1” (25 mm)
Require additional
mounting
components
LOFM - Introduction
In-line, small pipe diameter
electromagnetic flow sensor
PVDF wetted material
3/8” (9.5 mm) & ¾” (19 mm)
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LOFM - Specifications
Service: Compatible clean or dirty non-coating,
conductive liquids
Range: 0.03 to 20 GPM (0.01 to 1.3 LPS)
Accuracy: +1% of reading
Output: Current sinking, square wave
pulse, opto-isolated, 30 VDC @ 5 mA
max. and 4 to 20 mA
Enclosure Rating: NEMA 4X (IP66)
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LOFM - Features
Corrosion resistant
PVDF material
No moving parts
Non obstructive flow
Can accurately measure flow
rates as low as 0.03 GPM
(.002 LPS)
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MFS & MFS2 - Introduction
In-line electromagnetic flowmeter
For small pipe sizes
MFS 316 SS body
½ to 1” (13 to 25 mm)
MFS2 plastic body
MFS
½ to 1-1/4” (13 to 32 mm)
MFS2
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MFS & MFS2 - Specifications
Service: Water and other conductive liquids
Accuracy: ±2% of reading
Output:
Frequency: Square-wave, NPN
Analog: 4 to 20 mA
MFS
Enclosure Rating: NEMA 4 (IP65)
MFS2
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MFS & MFS2 – Features
Compact design
Low cost
No moving parts
Ideal for lower
flows
Lower pipe sizes
MFS
MFS2
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FLMG - Introduction
Inline electromagnetic flowmeter
Transmits and displays
flow rate and total
150 # ANSI flange
4, 6, 8, 10 in (102, 153 ,203, 254 mm)
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FLMG - Specifications
Service: Compatible non-coating conductive
liquids
Wetted Materials: Liner: Dual durometer rubber
Accuracy: ±1%
Output: Current sinking square wave pulse, optoisolated
Battery Life: 2 months with
power failure; 10 years with power
Enclosure Rating: NEMA 4X (IP66)
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FLMG - Features
No Moving Parts
Unaffected by potential debris in flow such as sand
Manufactured to customer specification
Model designed to mount in 4 to 10” (102 to 254
mm) lines
No adjusting sensor height to center of flow, bolt
inline an go
Larger magnetic field
Requires fewer upstream and
downstream pipe diameters
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FLMG - Features
NEMA 4X (IP66) rated housing
Allows for use both indoor and outdoor
Flow outputs
Rate and flow totalizing standard
Internal battery backup standard
Allows unit to continue working if
power failure/outage occurs
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Advantages and Disadvantages
In-line vs. Insertion
Built to specific pipe size, one size does not fit all
Flow-thru design allows for minimal/no
pressure drop
Can be used in applications with solids and
debris in flow stream
Higher cost than insertion flow sensors
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Installation Accessories
RTI Rate/Total Indicator
BAT Blind Analog Transmitter
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RTI - Features
Indicator and transmitter accessory for IEFS,
EFS2, and FLMG
Takes pulse input from flow sensor and converts
signal to display flow rate and total
Displays flow rate and flow total on LCD
display
Provides linear 4 to 20mA output of flow
NEMA 4X (IP 66) rating for indoor and
outdoor use
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RTI - Features
Mounts to wall, flow sensor, or local panel
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BAT - Features
Transmitter accessory for IEFS, EFS2, and
FLMG
No Display, blind unit
Takes pulse input from flow sensor and converts
signal to flow rate signal
Output signal linear 4 to 20mA output of flow
NEMA 4X (IP 66) rating for indoor and
outdoor use
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BAT - Features
Mounts to wall or Flow Sensor
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When not to recommend
electromagnetic flow sensors
Applications with fluids with low conductivity
De-ionized water or boiler feed water
Low conductivity can cause the meter to turn off
and indicate zero flow
Hydrocarbon and gas applications
Hydrocarbons and gases are non conductive and can
not be measured
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Applications
Agriculture
Irrigation
Sprayers and Spreaders
Fertigation
Building Automation
HVAC Systems
Municipalities
Water and Wastewater
Industrial Process
Chemical Metering Pumps
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Agriculture
Irrigation
Used for measuring and monitoring water consumed
during growing season on pivot systems
Sprayers
Used for monitoring chemical sprayed on crops
during growing season
Spreaders
Used for monitoring flow of organic materials,
including manure, used as fertilizer
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Building Automation
Water audits and consumption
Used to verify water intake to building, verified
against city municipality billing
LEED
Used to verify water consumption for LEED credits
in buildings for water conservation
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Municipalities
Wastewater Facilities
Used to measure treated and untreated sewage
Used to measure process water
Used to measure chemical flow for sewage treatment
Water Facilities
Used for measuring flow in water mains
Used for early indication of water main break
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Irrigation
Magnetic Flowmeter used for flow measurement
in Pivot Irrigation system
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Spreader
Magnetic Flowmeter used in manure spreading
system
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Fertigation
Golf course groundwater monitoring and
fertilizing
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HVAC System
Magnetic Flowmeter used for billing in a heating
system
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Water
Magnetic Flowmeter used in pump house for
groundwater monitoring
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Wastewater
Gravity-fed waste pumping facility
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Industrial
Magnetic Flowmeter used in water park pump
and treat
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The materials included in this compilation are for the use of Dwyer
Instruments, Inc. potential customers and current employees as a
resource only. They may not be reproduced, published, or
transmitted electronically for commercial purposes. Furthermore, the
Company’s name, likeness, product names, and logos, included
within these compilations may not be used without specific, written
prior permission from Dwyer Instruments, Inc. ©Copyright 2014
Dwyer Instruments, Inc.
www.hvac.vn