Watson-Marlow 501RL - Manual (Page 19)

Lift the two levers (1) at either side of the pumphead and remove the track, as
above. Remove both locating "pegs". Take the two tube lengths (2) and insert
into the "arches" of the tube clamps (3) ensuring that the nominal distance
between the clamps is 145mm for bore sizes up to 8.0mm and 150mm for
9.6mm bore. All tube clamps are marked with the nominal bore for their
intended tubing and only the correct size should be used.
Using two
independent
tubes
Take the tube assembly and secure one tube clamp. Whilst stretching the
tubing slightly, fit the second tube clamp locking it down securely.
Replace the track and pull down the securing levers.
When fitting new lengths of Marprene tubing, run for about half an hour and
then re-tension the tubing, making sure that the nominal lengths above are
restored. If tubing lengths greater than those given are used, the tubing may
move about within the pumphead and damage will occur.
Care and maintenance
The 505L pumphead is "maintenance free" although you should check moving
parts of the rotor from time to time for freedom of movement.
If aggressive liquids are spilled on to the pumphead, the head should be
removed and cleaned. Do not use strong solvents.
Adjustment of the track
The track is set for use with 2.4mm wall tubing with bore sizes from 1.6mm to
9.6mm. If other tubing is used, It may require the adjustment of the track/rotor
gap setting. This setting may also be used to "fine tune" each channel to
achieve identical flow rates.
Normal setting 14.3mm (0.56")
To restore the original setting, a dimension of 14.3mm (0.56") should be set
from the track to the top from the pumphead. The adjustment screw is made
with the screw between the two guide pins on the top of the track.
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