Special Conditions
Special conditions and/or limitations apply to the safe application of gearwheel flow meters
in the approved operating environment. These conditions and/or limitations must be met
by the customer and/or system operator by means of appropriate technical and/or
organizational measures.
•
Gearwheel flow meters must only be operated in the specified environment and
under the specified ambient conditions.
•
Gearwheel flow meters must only be used if the materials used in their construction
are resistant to mechanical and/or chemical influences or corrosion under the given
service conditions.
•
The fluid must at least have minimum lubricating properties (lubricity).
•
Gearwheel flow meters are intended for use with liquids. Dry operation is not
approved.
•
Operation outside of the specified parameters is not allowed.
•
If necessary, a filter must be installed to prevent the gearwheel from being blocked
by foreign objects.
•
The specified installation, service and maintenance schedules must be strictly fol -
lowed.
•
Gearwheel flow meters must only be used in closed operation and not be subject to
excessive vibration.
•
Only genuine spare parts must be used for service and maintenance.
Corrosion Protection
All gearwheel flow meters are checked for proper function at the factory with mineral-
based hydraulic oil. Following testing, the connections are sealed with plugs so that the
internal parts are protected against corrosion for a moderate amount of time.
During transport and storage, gearwheel flow meters must not be exposed to the harmful
effects of ambient weather conditions and great variations in temperature. They must be
stored under dry conditions.
If a gearwheel flow meter is to be stored for a longer period of time, both its interior and
exterior must be protected by application of a suitable anti-corrosion oil. In addition, it must
be protected from humidity by means of a desiccant material.
If high humidity or other unfavorable (aggressive, polluted) ambient conditions are expec -
ted to be encountered during transport, appropriate steps must be taken to prevent corro -
sion of the gearwheel flow meter.
Attention:
When preserving, check whether the preservative is compatible with the materials and
elastomers used in the gearwheel flow meter. Furthermore, compatibility with the pumped
medium must be ensured.
DV04 Instruction manual 02/2021
page 4