User’s Guide
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FMG90 Series
Electromagnetic Flow Meter
Table of contents page
1 About this operating manual....................................................................................4
2 Device description...................................................................................................5
2.1 Intended use....................................................................................................6
2.1 Exclusion of liability .........................................................................................6
3 Safety instructions...................................................................................................7
4 Construction and function .......................................................................................8
5 Installation...............................................................................................................8
5.1Installation instructions ...........................................................................................9
5.2 Assembly.......................................................................................................10
6 Electrical connection .............................................................................................11
7 Commissioning and measuring operation .............................................................12
7.1 Commissioning .............................................................................................. 12
7.2 Measuring operation......................................................................................12
8 Maintenance..........................................................................................................12
9 Disassembly and disposal.....................................................................................13
10 Technical data.......................................................................................................14
10.1 Materials table ..............................................................................................15
10.2 Pressure drop...............................................................................................15
10.3 Dimensions................................................................................................... 16
Copyright notice:
The reproduction, distribution and utilization of this operating manual as well as the
communication of its contents to others without express authorization is prohibited.
Offenders will be held liable for the payment of damages. All rights reserved in the event of
the grant of a patent, utility model or design.
1 About this operating manual
• The operating manual is aimed at specialists and semi-skilled personnel.
• Before each step, read through the relevant advice carefully and keep to the specified order.
• Thoroughly read and understand the information in the section (Safety Instructions
If you have any problems or questions, please contact:
One Omega Dr. Box 4047
Stamford, CT 06907-0047
Tel: (203) 359-1660
e-mail: info@omega.com
"3").
Hazard signs and other symbols used:
WARNING! / CAUTION! Risk of injury!
This sign indicates dangers that cause personal injuries that can lead to health defects or
cause considerable damage to property.
CAUTION! Electric current!
This sign indicates dangers which could arise from handling of electric current.
CAUTION! Material damage!
This sign indicates actions which could lead to possible damage to material or environmental
damage.
ADHERE TO OPERATING MANUAL!
NO DOMESTIC WASTE!
The device must not be disposed of
together with domestic waste.
Pay attention to and comply with
information that is marked with this symbol.
ª Follow the specified instructions and steps.
Adhere to the given order.
NOTICE!
This symbol indicates important notices,
tips or information.
Check the specified points or notices.
J Reference to another section, document or
source.
• Item.
2 Device description
The FMG90 series from Omega, is a non-contact flow sensor. The measurement is
performed using magnetic induction and works without any moving parts.
The FMG90 is used for measuring or metering water and aqueous solutions. The compact
design and independence from the intake and discharge sections allows the FMG90 to be
used under a variety of conditions.
Components:
c Sensor housing:
The sensor housing consists of plastic and has the IP65 degree of protection.
d Electrical connection:
The electrical connection is made via 4-pin plug M12x1.
e Operation / flow indicator LED.
f Type plate with flow direction (marking)
g Process connection:
The process connections are available in different sizes.
2.1 Intended use
The magnetic inductive flow sensor FMG90 must only be used for measuring and metering
liquids with a minimum conductivity of 20 μS/cm.
WARNING! No safety component!
The magnetic inductive flow sensor of the series FMG90 are not safety components in
accordance with Directive 2006-42-EC (Machine Directive).
ª Never use the FMG90 as a safety component.
The operational safety of the device supplied is only guaranteed within its intended use. The
specified limits (see Technical Data "10") may under no circumstances be exceeded.
Before installing the device, check that the wetted materials of the device are compatible with
the media being used (see Materials Table "10.1").
Measuring tube empty (or partially filled). / Conductivity too low.
The green LED may blink irregularly if the measuring tube of the FMG90 is empty or
partially filled or if the conductivity of the fluid being used is too low. Random pulses will
be present at the output, but they do not represent an actual flow.
ª Ensure that the measuring tube of the FMG90 is always completely filled (see
Installation Instructions "5.1").
ª Ensure that the conductivity of the fluid is at least 20 μS/cm.
2.1 Exclusion of liability
We accept no liability for any damage or malfunctions resulting from incorrect installation,
inappropriate use of the device or failure to follow the instructions in this operating manual.
3 Safety instructions
Before you install the FMG90, read through this operating manual carefully. If the
instructions contained within it are not followed, in particular the safety guidelines, this
could result in danger for people, the environment, and the device and the system it is
connected to.
The FMG90 correspond to the state-of-the-art technology. This concerns the accuracy, the
operating mode and the safe operation of the device.
In order to guarantee that the device operates safely, the operator must act competently and
be conscious of safety issues.
Omega provides support for the use of its products either personally or via relevant literature.
The customer verifies that our product is fit for purpose based on our technical information.
The customer performs customer- and application-specific tests to ensure that the product is
suitable for the intended use. With this verification all hazards and risks are transferred to our
customers; our warranty is not valid.
Qualified personnel:
The personnel who are charged for the installation, operation and maintenance of the
FMG90 must hold a relevant qualification. This can be based on training or relevant
tuition.
The personnel must be aware of this operating manual and have access to it at all times.
The electrical connection should only be carried out by a fully qualified electrician.
General safety instructions:
In all work, the existing national regulations for accident prevention and safety in the
workplace must be complied with. Any internal regulations of the operator must also be
complied with, even if these are not mentioned in this manual.
Degree of protection according to EN 60529:
Please ensure that the ambient conditions at the site of use does not exceed the
requirements for the stated protection rating (see Technical Data "10").
Only use the FMG90 if it is in perfect condition. Damaged or faulty devices must be
checked without delay and, if necessary, replaced.
When fitting, connecting and removing the FMG90 use only suitable appropriate tools.
Do not remove or obliterate type plates or other markings on the device, as otherwise the
warranty is rendered null and void.
Special safety instructions:
(Further) Warnings that are specifically relevant to individual operating procedures or activities
can be found at the beginning of the relevant sections of this operating manual.
4 Construction and function
Construction:
The measuring tube with its earthing sleeves and electrodes
passes through the sensor housing and forms the external
process connection of the FMG90.
A magnetic field for the measurement process is generated inside
the sensor housing, which also contains the sensor and signal
conditioning circuitry.
The two stainless steel electrodes are located in the middle of the
measuring tube between the earthing sleeves. The FMG90 does
not need any moving parts to make measurements. The inside of
the measuring tube is completely open, allowing the fluid to flow
unhindered through the measuring tube.
Function:
The magnetic inductive flow sensor functions according to the induction principle:
The measuring tube is located in a magnetic field (B). If
an electrically conductive medium (V) flows through the
measuring tube and, therefore, at right angles to the
magnetic field, a voltage (U) which is proportional to
the mean flow velocity will be induced in the medium
and subsequently picked up by the two electrodes.
5 Installation
Before installing, check that
the wetted materials of the device are suitable for the media being used (see Materials
Table "10.1").
the equipment is switched off and is in a safe and de-energised state.
the equipment is depressurised and has cooled down.
SUITABLE TOOLS:
Use only suitable tools of the correct size.
5.1 Installation instructions
CAUTION!
Risk of malfunction due to external magnetic fields!
Magnetic fields close to the device can cause malfunctions and
should be avoided.
ª Ensure that no external magnetic fields are present at the
installation site of the FMG90.
• The FMG90 can always be installed anywhere along the pipeline. Straight sections of
piping are preferable, however.
• Installation can occur in horizontal and vertical pipes. The flow sensor is only suitable for
application in completely filled pipe systems.
• As a matter of principle magnetic inductive flow sensors are widely independent from the
flow profile. An inlet section is not absolutely necessary.
To reach a most highly accuracy of the measurement, you should use straight inlet and
outlet sections according to the nominal pipe diameter (DN). The inlet pipe section has to
be at least 10 x DN; the outlet section 5 x DN in order to achieve the specified accuracy.
• The inlet and outlet sections and the gaskets must have the same or a slightly larger
inside diameter than the measuring tube in order to achieve the specified accuracy.
• If two or more FMG90 devices are used side by side, maintain
a separation of at least 2.5 cm between adjacent devices.
If adjacent devices are too close together, operation of both
devices may be impaired due to mutual interference.
5.2 Assembly
The FMG90 is installed directly into the pipeline. The compact design and light weight of the
unit make wall-mounting unnecessary.
IMPORTANT NOTICES:
• Only use suitable gaskets for installation.
• Observe the flow direction indicated on the type plate.
• Observe the mounting dimensions.
ª To ensure the best possible measuring accuracy, a horizontal
installation position with increasing flow is preferable (no
collecting of dirt deposits).
ª Install the appropriate screwed connections at the installation
location.
ª Insert the FMG90 together with the gaskets.
ª Screw the union nuts of the screwed connection onto the
process connections of the FMG90.
ª Tighten both union nuts with a maximum torque of 5 Nm.
6 Electrical connection
The electrical connection of the FMG90 is via the 4-pin plug M12x1 at the top.
The corresponding connection cables with moulded coupling socket are available in various
lengths.
CAUTION! Electric current!
The electrical connection should only be carried out by a fully qualified electrician.
ª De-energize the electrical system before connecting the FMG90.
Connection and wiring:
ª Screw the coupling socket of the connection cable to the plug of the FMG90.
ª Tighten the knurled nut of the coupling socket with a maximum torque of 1 Nm.
ª Connect the connection cables according to the following wiring diagrams.
Pin assignment:
Pin 1: +UB
Pin 3: GND
Pin 2 / 4: Frequency output NPN/PNP
Pin configuration with
NPN frequency output:
PNP frequency output:
Pull-up- / pull-down-resistors R.
We recommend using resistors of ~1 kΩ (12V) respectively ~2,2 kΩ (24V) and 0.25 W for
the pull-up / pull-down wiring.
Please note that the maximum signal current of 25 mA will not be exceeded.
7 Commissioning and measuring operation
Before switching on the FMG90 for the first time, please follow the instructions in the following
section.
7.1 Commissioning
Check that
the FMG90 has been installed correctly and that all screw connections are sealed.
the electrical wiring has been connected properly.
the measuring system is vented by flushing.
ª Switch on the supply voltage.
If the red LED lights permanently; then the FMG90 is ready for use and goes into measuring
operation.
7.2 Measuring operation
The red LED is constantly lit to indicate that the FMG90 is
operational.
The green LED blinks according to the frequency of the output
signal.
This blinking is not perceptible to the human eye at frequencies
above 30 to 40 Hz, so the green LED appears to be constantly lit.
Frequency output:
The frequency output provides a flowproportional PNP/NPN square wave signal.
8 Maintenance
Maintenance:
The FMG90 is maintenance-free and cannot be repaired by the user. In case of a defect, the
device must be replaced or sent back the manufacturer for repair.
CAUTION! Material damage!
When opening the device, critical parts or components can be damage.
ª Never open the device and perform any repair yourself.
Cleaning:
Clean the FMG90 with a dry or slightly damp lint-free cloth. Do not use sharp objects or
aggressive agents for cleaning.
9 Disassembly and disposal
CAUTION! Risk of injury!
Never remove the device from a plant in operation.
ª Make sure that the plant is shut down professionally.
Before disassembly:
Prior to disassembly, ensure that
the equipment is switched off and is in a safe and de-energised state.
the equipment is depressurised and has cooled down.
Disassembly:
ª Remove the electrical connectors.
ª Remove the FMG90 using suitable tools.
Disposal:
NO HOUSEHOLD WASTE!
The FMG90 consists of various different materials. It must not be disposed of with
household waste.
10 Technical data
The technical data of customised versions may differ from the data in these instructions.
Please observe the information specified on the type plate.
Type FMG 91 FMG 92 FMG 93 FMG 94 FMG 95 FMG 96
Measurement device characteristics
Flow range [GPM]
Accuracy 1% of reading
Repeatability 1%
Output signal
starting from [GPM]
Max. flow rate [GPM]
Response time < 100 ms
Indications red LED = Supply voltage • green LED = Flow
Output signal characteristics
Frequency output:
- Pulse rate / K-
Factor *
[pulses/gal]
- Resolution *
[ml/pulse]
- Signal current ≤ 25 mA
Electrical characteristics
Supply voltage 24 VDC ±15% or 12 VDC ±15%
Power consumption 0.6 W
Electrical protection
measures
Electrical connection 4-pin-plug M12x1
0.066…1.3 0.26…5.3 0.66…13.2 1.3…26.4 2.6…53 3.3…66
0.02 0.07 0.27 0.52 1.05 1.3
1.6 6.6 15.8 31.7 63.4 79.3
15000 3000 1500 750 380 300
0.25 1.0 2.5 5.0 10.0 12.5
Square wave signal • duty cycle 50:50 - Signal shape
can be connected as PNP or NPN open collector
short-circuit proof • protected against polarity reversal
Degree of protection IP 65 (only with a connected coupling)
Process variables
Medium to measure Water and other conductive liquids
min. conductivity of
the medium
Medium temp. 14…140 °F (not freezing)
Ambient temp. 41…140 °F
Nominal diameter DN 8 DN 15 DN 20 DN 25
Inner diameter 0.31 inch 0.55 inch 0.71 inch 0.98 inch
145 psi (68 °F) • 116 psi (104 °F) • 87 psi (140 °F) Max. working
pressure (at …)
higher pressure ratings on demand
Process connection ½ - 14 NPT ¾ - 14 NPT 1 - 11.5 NPT 1¼ - 11.5
20 μS/cm
NPT
FMG 91 / FMG 92
FMG 93
FMG 94 / FMG 95
FMG 96
10.1 Materials table
Component Material Component-
wetted
Sensor housing ABS
Measuring tube PVDF
Process connections
PVDF
O-ring EPDM
Electrodes Stainless steel 316L
Grounding rings Stainless steel 316L
X
X
X
X
X
10.2 Pressure drop
FMG 91 / FMG 92
FMG 94 / FMG 95
FMG 93
FMG 96
10.3 Dimensions
FMG 91 - 95
FMG 96
Type
FMG 91
FMG 92
FMG 93
FMG 94
FMG 95
L1 L2 D1 D2
4± 0.02 0.83± 0.01 ½ - 14 NPT Ø 0.31
4± 0.02 0.83± 0.01 ½ - 14 NPT Ø 0.31
4.02± 0.02 0.83± 0.01 ¾ - 14 NPT Ø 0.55
4.41± 0.02 0.98± 0.01
4.41± 0.02 0.98± 0.01
1 – 11.5
NPT Ø 0.71
1 – 11.5
NPT Ø 0.71
M-5204/1112
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