IMPORTANT: Opening the flowmeter will void the Flow
Calibration value assigned to your unit. However, you may
need to take the flowmeter apart for periodic cleaning or
to remove an obstruction. See Illustration 48 for flowmeter
reassembly instructions.
TO OPEN THE FLOWMETER
Cut the calibration tag retaining wire. Remove the screws
and disassemble the flowmeter. Do not attempt to remove
sleeve bearings from flowmeter housings.
Use warm water and if necessary, a mild detergent and soft
bristled brush to clean all parts. DO NOT USE SOLVENTS OR
DIESEL FUEL TO CLEAN THE FLOWMETER. A magnet works
well for removing fine metallic particles from the turbine.
Inspect all parts. Check for excessive bearing or shaft wear.
The shaft will wear shorter until the turbine drags on the
housing. Once the turbine drags, the entire flowmeter can
be turned end-for-end, and the turbine “worn out” again.
When both ends of the shaft are worn to the point of drag,
the turbine must be replaced.
PLEASE NOTE: The turbines have magnets built into the fins.
There are no visible magnets on the inside of the cavity.
Complete assembly
FM750 GFN Flowmeter
P/N 11501
On a flat surface, place each housing half on end. Set and
spin the turbine in each half. It should spin freely. If it does
not spin freely, remove the turbine, wipe the shaft and try
again. If it still does not spin freely, the shaft or bearings may
have excessive wear. (Service may be necessary.)
TO ASSEMBLE THE FLOWMETER
Place turbine in non-sensor housing. Coat O-ring with silicon
grease and position O-ring on housing. (O-ring may be
reused a few times, but will eventually need to be replaced).
Carefully set turbine in place. Drop all screws into holes.
Hold nuts in place and finger-tighten screws. Making sure
O-ring is still properly aligned, evenly tighten all screws.
Attach tag.
After assembly, shaking flowmeter end-to-end should
produce a “rattling” sound (shaft end play). Blowing into
the meter from either end should cause the turbine to spin
freely. If the turbine only spins from one direction, install the
flowmeter so that the liquid flows in that direction.
For maximum accuracy the flowmeter should be mounted in
a vertical position. Accuracy of flowmeter readings cannot
be guaranteed for flow rates below two gallons per minute.
Recalibration is required before field operation.
Appendix A
Flowmeter Assembly (FM-750 GFN)
47
Illustration 48
Housing FM750 GFN
Turbine
P/N 14836
Quad-ring
P/N 13783
Housing FM750 GFN
(Non Sensor)
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