Omega FMG90B Series, User Manual, Page: 10 / 24

Installation of FMG90B FMG90B Series
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•
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 inner diameter. The inlet section has to be at least
10 x inner diameter; the outlet section 5 x inner diameter 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 FMG90B devices are used side by side,
maintain a separation of at least 1.0 in between adjacent
devices.
If adjacent devices are too close together, operation of both
devices may be impaired due to mutual interference.
4.2 Assembly
The FMG90B 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 (

§ 9.3 “Dimensions”).

Select an appropriate location for installation
(

§ 4.1 "Installation instructions").
To ensure the best possible measuring accuracy, a vertical
installation position with increasing flow is preferable (no
collecting of dirt deposits).

Wrap the FMG90B connections with 1 to 2 wraps of thread
tape (e.g. Teflon ® tape). Wrap tape in a clockwise direction,
viewed form the end, leaving the first two threads uncovered.

Make sure the tape does not intrude into the flow path.

Attach the FMG90B with arrow pointed in the direction of flow.

The fittings should be screwed into FMG90B hand tight.
CAUTION! Material damage!
Maximum torque 3.7 ft lb.
While tightening, counter the FMG90B only by hand!
If you use an open-end or a pipe wrench, the FMG90B can
be damaged.

To tighten the FMG90B, use an open-end or a pipe wrench
for the fittings and only the hand for the FMG90B.