Omega FMG90 Series User manual

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FMG90 Series
Electromagnetic Flow Meter
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User’s Guide

Table of contents page
1About this operating manual....................................................................................4
2Device description...................................................................................................5
2.1 Intended use....................................................................................................6
2.1 Exclusion of liability .........................................................................................6
3Safety instructions...................................................................................................7
4Construction and function .......................................................................................8
5Installation...............................................................................................................8
5.1Installation instructions ...........................................................................................9
5.2 Assembly.......................................................................................................10
6Electrical connection .............................................................................................11
7Commissioning and measuring operation .............................................................12
7.1 Commissioning ..............................................................................................12
7.2 Measuring operation......................................................................................12
8Maintenance..........................................................................................................12
9Disassembly and disposal.....................................................................................13
10Technical 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 "3").
If you have any problems or questions, please contact:
One Omega Dr. Box 4047
Stamford, CT 06907-0047
Tel: [phone]
e-mail: [email protected]
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!
NOTICE!
This symbol indicates important notices,
tips or information.
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.
ªFollow the specified instructions and steps.
Adhere to the given order.
Check the specified points or notices.
JReference 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:
cSensor housing:
The sensor housing consists of plastic and has the IP65 degree of protection.
dElectrical connection:
The electrical connection is made via 4-pin plug M12x1.
eOperation / flow indicator LED.
fType plate with flow direction (marking)
gProcess 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).
ªNever 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.
ªEnsure that the measuring tube of the FMG90 is always completely filled (see
Installation Instructions "5.1").
ªEnsure 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.
ªEnsure 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.
ªTo ensure the best possible measuring accuracy, a horizontal
installation position with increasing flow is preferable (no
collecting of dirt deposits).
ªInstall the appropriate screwed connections at the installation
location.
ªInsert the FMG90 together with the gaskets.
ªScrew the union nuts of the screwed connection onto the
process connections of the FMG90.
ªTighten both union nuts with a maximum torque of 5 Nm.