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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 below).
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 replacement is necessary, unscrew
the sensor by hand. Screw the replacement sensor in and
tighten by hand.
Reconnect the sensor according to the diagram below.
SES SENSOR CONNECTION
Page 7
FPR300/310 SERIES INSTRUCTIONS
(BLACK) Power (-)
(WHITE) Signal
(RED) Power (+) 6-24 Vdc
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