INSTALLATION
Meter Orientation
Cox Precision Turbine Flow Meters may be installed in any position without affecting performance . Be sure direction of flow is
in the direction of the arrow engraved on the flow meter body .
Exception
: Position gas service meters as calibrated .
Piping
Recommended layout for Cox Precision Turbine Flow Meters specifies a straight section of pipe or tube in the same size as the
flow meter and equal in length to 10 diameters on the upstream side, and a similar section equal in length to 5 diameters in
order to retard the formation of swirls in the liquid, which can cause incorrect flow meter output . If space prohibits the use
of these straight sections, use extreme care in arranging the piping to produce as straight and smooth a flow as possible .
Available Cox Flow Straighteners are listed in the
Cox Flow Straighteners Product Data Sheet
. Go to
Use of Pipe Compound
The 37-degree flared tube connections of Cox Precision Turbine Flow Meters DO NOT require any sealing compound or Teflon
tape, and none should be used . The use of these on adjacent piping should be held to a minimum in order to avoid coating
the bearings and rotor blades with compound, causing premature rotor failure and erratic performance .
OTEE:
N
Copper conical seals or crush rings may be used, if necessary .
BLEED ALL AIR AND VAPOR FROM THE LIQUID AFTER INSTALLING OR REINSTALLING A FLOW METER.
START FLOW SLOWLY TO AVOID SENDING A “SLUG” OF HIGH VELOCITY AIR OR VAPOR THROUGH THE FLOW METER
AND CAUSING IT TO OVERSPEED. START REQUIRED FLOW AFTER FLOW METER IS FULL OF LIQUID. AERATED LIQUIDS
FLOWING THROUGH A FLOW METER WILL RESULT IN INCORRECT FLOW RATES.
DISASSEMBLY
Cox Precision Ball Bearing Type
1 . Firmly hold flow meter and, using tweezers, carefully remove internal snap ring from the upstream end .
2 . Use long nose pliers and grasp one vane of flow straightener and gently pull flow straightener and rotor assembly from
the body . Use slight twisting motion . Snug fit at transition .
3 . Press down on the hub to relieve spring pressure on C-washer and remove with tweezers or thin nosed pliers . Remove
hub, spring and spacer .
4 . Carefully remove rotor from shaft .
5 . Remove a snap ring from side of bearing and push bearing out of rotor .
OTEE:
N
Models CLFA6 and CLFB6 must be returned to factory for bearing change .
CLEANING
Immerse all parts, except pickoff, in a clean, filtered solvent suitable for removing residue from the liquid the flow meter has
been used with . If necessary, use a soft bristle brush .
If there is foreign matter in the ball bearings, allow them to soak in the solvent for approximately 10 minutes and then dry
with filtered compressed air . Do not use excessive air pressure .
OTEE:
N
Do not sonic clean bearings!
EXERCISE EXTREME CARE DURING THE CLEANING PROCESS SO THAT NONE OF THE PARTS ARE DROPPED,
SCRATCHED OR DAMAGED IN ANY WAY. NO ATTEMPT SHOULD BE MADE TO FURTHER POLISH ANY OF THE PARTS,
ESPECIALLY THE ROTOR.
User Manual
Page 7
May 2014
