Maintenance And Repair - Omega FPR300 Series User Manual

MAINTENANCE and REPAIR

Rotor Replacement. There is only one moving part to this
meter. The bearings are made of ruby, which rarely wears
out or needs replacement unless they have been physically
damaged by severe shock. The shaft is integrally molded
into the rotor, and shaft and rotor are replaced as one part.
(You may wish to replace the bearings, using the bearing
removal tool, while the meter is disassembled for rotor
replacement). To replace the rotor, disconnect the meter
and remove the four screws that hold the cover in place.
Lift the cover and remove the rotor (see parts diagram).
When putting in the new rotor, be sure that the ends of
the shaft are in both bearings before tightening the cover.
The rotor can be easily dropped into the bottom bearing.
Starting the shaft into the upper bearing requires a bit of
care. It is easier if the rotor is spinning, which can be done
by lightly blowing into a port. When the upper bearing plate
drops into place, hold it down and check for free spinning
(by blowing lightly) before replacing the cover. Check that
the O-ring is in its seat on the bearing plate before replacing
the cover. Replace the cover, insert the four cap screws
and tighten.
Sensor Replacement. The sensor ordinarily does not need
replacement unless it is electrically damaged. If replace-
ment is necessary, unthread the sensor by hand. Thread
the replacement sensor in and tighten by hand.
Reconnect the sensor according to the diagram below.
SES SENSOR CONNECTION
(BLACK) Power (-)
(WHITE) Signal
(RED) Power (+) 6-24 Vdc