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2. General Description
Please follow all instructions in this manual to ensure the trouble-free ope-
ration of the FHG flow meters. Omega does not assume responsibility or
liability for damages resulting from noncompliance with these instructions.
The device may only be opened within the warranty period after consulta-
tion and approval by Omega.
3. FHG Flow Meter Selection
4. Declaration of Conformity
5. General Operating Requirements
For the trouble-free, safe, and reliable operation of the flow meters, se-
lecting the correct type and size is critical. Because of the wide variety of
applications and flow meter designs, the technical data in the Omega cata-
log are general in nature. Certain properties of the devices are dependent
on type, size and measuring range, as well as the liquid to be measured.
Please contact Omega or one of our sales and service representatives for
detailed information about the appropriate flow meter for your particular
application.
Flow meters of the ”FHG“ series have been tested for their electromagnetic
compatibility and interference emissions as outlined by the EMC Directive
and are in compliance with the applicable statutory EMC Directives.
They cannot be operated independently, are connected by cable to a po-
wer source, and provide digital electrical signals for electronic evaluation.
All flow meters have a declaration of conformity, which can be requested
if necessary.
Since the electromagnetic compatibility of the entire measuring sys-
tem is also dependent on the installation of the cables, the correct
connection of the shield, and each individual connected device, all
components must comply with the EMC Directive, and the electroma-
gnetic compatibility of the entire system, machine, or system must be
ensured as well.
All flow meters have been tested in accordance with the applicable statuto-
ry EMC Directives of EN 61000-6 and are CE certified. The EC conformity
marking is the CE mark affixed to all flow meters.
Before assembly, commissioning or operation, check and verify the following
properties & aspects of the respective circumstances of your system to ensure
operation is trouble-free, safe, and reliable.
1. The Fluid to be Processed
Are the flow meter seals and materials
compatible with
for the fluid and any cleaning agents that will be used
?
Is the fluid
viscous
or
abrasive
? Have you properly sized the meter and selected appropriate bearing materials?
Is the fluid
dirty
or does it contain
contaminants/pollutants
and
solid particles
that may require filtration?
Does the fluid have
fillers
or other
additives
? What grain sizes do these solids have, and could they
block the measuring element
?
Is it necessary to install an upstream
hydraulic filter
(see filtering requirements in section 22 of this document)?
Are
tubes and pipes clean
and free of assembly residues such as chips, weld spatter?
Is the
tank clean
and is it impossible for impurities or
foreign substances
to reach the pipeline or tubing system from the tank?
Is a different fluid used frequently and is the system sufficiently flushed and
rinsed
in between?
Are pipelines/tubes and the entire system completely
deaerated (
the system should be slowly filled with fluid before operation at full flow
to avoid hydraulic shock on the mechanical components
)
?
2. Hydraulic Properties of the System
Is the
max. operating pressure
of the system less than the max. permissible operating pressure of the flow meter?
Is the
max. pressure drop ∆p
(at flow meter) below the max. permissible pressure drop?
Is the
pressure drop ∆p
not excessive with max. flow (e.g. high viscosity)?
Does the flow range of the flow meter (dependent on the viscosity) correspond with the
present flow
?
Please note that the flow range is less with
higher viscosity
!
Does the temperature range of the flow meter correspond with
the present max. temperature
of the fluid?
Is the
cross-section
of the pipelines/tubes large enough and are there no overly large pressure drops in the system?
Is the
hydraulic connection
(inlet/outlet) connected corrected and sealed properly?
Note: A blocked flow meter can stop the entire flow. Does the system feature an
overpressure / bypass
valve? This valve must be checked and
maintained at regular intervals.
