Maintenance; Ball Bearing Replacement - Hoffer Flow Controls HP Series User Manual

MAINTENANCE

The field maintenance of the HP Series Flowmeter is limited to inspection
and/or replacement of a few components.
In general, it is advisable to remove the insertion meter from the line on a
periodic basis and examine it for contamination and wear.
Contamination of the rotor may occur if foreign matter succeeds in wrapping
itself about the well assembly. This is easily removed. The turbine rotor should
be checked for obvious damage (i.e., bent blades, shaft, etc.). If no damage is
apparent and the rotor spins freely, it may be returned into service.
The types of bearings installed in the flowmeter have been selected to operate
in the type of service being metered.
It is recommended that the bearings be checked periodically for wear. Since the
type of fluid being measured, as well as temperature, have a direct relationship
on the bearing life expectancy, it is best to contact the HFC Engineering
Department for the proper preventive maintenance interval.
If the rotor wobbles on the shaft, bearing wear is indicated and necessitates
replacement. If the rotor fails to spin freely, the bearings may be suspected.
Ball bearings may be replaced in the field, all others should be returned to
factory for rework and recalibration.
It is recommended that the bearings be replaced if any signs of wear are
apparent. An unexplained shift in the output accuracy could be a sign of worn
bearings.
CAUTION:
Should the unit fail to produce an output signal while the rotor is spinning, the
pickup coil may be suspect.
Complete calibrated Well Assemblies are available from Hoffer Flow Controls,
Inc. Consult factory for pricing and availability.

BALL BEARING REPLACEMENT

Remove the meter to a clean, flat work surface.
To disassemble:
Loosen the stem clamp and carefully slide the housing towards the handle
exposing the Well Assembly (coil and rotor housing).
Inspect the rotor and Well for damage (bent blades, bent/damaged Well
supports, etc.). All damaged parts must be replaced.
HP-208
If bearings are allowed to operate without replacement at
the recommended interval, the accuracy of the device may
drift from the original calibration and if left long enough
severe damage to the rotor may occur.
Page 11 of 17 HP Insertion Meter