Watson-Marlow 323E, 323S, 323U and 323Du User Manual
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23.11 501RL pumphead
The 501RL and 501RL2 pumpheads are suitable for tubing with internal diameters up
to 8.0mm. The 501RL is set during manufacture for use with 1.6mm wall tubing and
501RL2 is set for 2.4mm wall tubing.
The spring-loaded rollers give extended tube life. The pumphead can be run clock-
wise, for best tube life, or anticlockwise for higher pressures. The “tool lockable”
guard should be locked shut while the pump is in use.
23.12 501RL and 501RL2 installation
The 501RL track will fit on the drive in three orientations. Secure the track with the
locating screw.
The rotor grips the drive shaft via a split collet. Ensure the drive shaft is degreased
before fitting the rotor. This will prevent the rotor slipping on the drive shaft during
operation. Tighten the rotor screw to a torque of 3Nm.
The track and rotor may be removed from the pump for cleaning or to reposition the
track on the pump.
There is a drive pin inside the rotor collet to engage with the end of the drive shaft.
To keep this pin correctly engaged on the drive shaft, we recommend that the collet
remains on the shaft, while the rotor is removed. Hold the rotor firmly and remove
the rotor retaining screw. Pull the rotor from the drive shaft leaving the collet on the
drive shaft. Remove the track locating screw. You may remove the track or rotate to
the new position. Align the track and refit the track locating screw. Refit the rotor.
23.13 501RL and 501RL2 tube loading
Switch off the mains supply. Unlock and open the pumphead guard.
Select a minimum length of 240mm of tubing. Fit one end of the tubing into a clamp.
The rotor has tube guide rollers that pull the tube into the pumphead during loading.
Turn the rotor carefully until the tube guides pick up the tube. Continue to turn the
rotor, and feed the tubing in between the guides.
When the tube has gone round the pump track fit the other end of the tubing into the
clamp. Check that the tubing has fitted naturally against the track for best tube life.
Release the clamps and adjust the tubing if it is slack, twisted, or stretched.
S220, U220,
Du220
