Watson-Marlow 504U/RL - Manual (Page 8)

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501RL Pumphead 501RL Pumphead 501RL Pumphead 501RL Pumphead 501RL Pumphead
The 501RL pumphead has two spring-loaded working rollers, which automatically compensate for minor variations
in tubing wall thickness, giving extended tube life. The 501RL is set during manufacture to accept tubing with wall
thicknesses of between 1.6mm and 2.0mm, and internal diameters of up to 8.0mm. It is equipped with a “tool
lockable” guard for increased safety. This should be locked shut whilst the pump is in use. The pumphead can be
run clockwise for extended tube life, or anti-clockwise to operate against higher pressures.
F FF F Flow r low r low r low r low ra aa a ates tes tes tes tes
Flow rates for the 504U were obtained using silicone tubing with the pumphead rotating clockwise, pumping water
at 20C with zero suction and delivery pressures. For critical applications determine flow rates under operating
conditions.
Installa Installa Installa Installa Installation tion tion tion tion
Remove the grub screws on the drive front panel to enable the pumphead to be fitted.
Fit the track in any one of three orientations, over the drive shaft and locating boss. Secure the track with the
locating screw. Ensure the drive shaft is degreased before locating the rotor onto the shaft via the split collet.
Rotate the rotor until its guide rollers are aligned flush to the front edge of the track. Tighten the rotor screw to a
torque of 3Nm to prevent the collet slipping during operation.
To reposition the track, swing out the crank handle to expose the rotor retaining screw. Turn the screw anticlockwise
one turn to release the collet, and withdraw the rotor from the shaft. Loosen the track locating screw, and pull the
track clear. Rotate the track to its new position and tighten the track locating screw. Use this method of removal
and fitting if cleaning is required.
T T T T Tube loading ube loading ube loading ube loading ube loading
Isolate pump from mains supply. Unlock and open the hinged guard and swing out the rotor crank handle until it
locks into position. Select the length of tubing required, noting that approximately 240mm is required for the
501RL track.
Fit one end of the tubing into one of the spring loaded clamps, and then, whilst rotating the rotor with the crank
handle, feed the tubing between the rollers and the track, aligning it within the rotor tube guides. The tubing must
lie naturally against the track and must not be twisted or stretched.