Watson-Marlow 403U - Manual (Page 7)

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Occlusion setting
 Increase the spring pressure until the pump starts pumping and then adjust the spring pressure according to the
flow rate required, which will be governed by the suction condition. For longest tube life, set the spring
pressure to the minimum required for satisfactory pumping.
Tube re-tensioning (pictures 10-12)
 When using Marprene tubing, after the first 30 minutes of running, re-tension the tube in the pumphead by
releasing the track occlusion pin and pulling the tubing on the discharge side a little. This is to counteract the
normal stretching that occurs with Marprene which can go unnoticed and result in poor tube life.
Tube removal
 Release the track by disengaging the sprung track occlusion pin and withdraw the tubing from the sprung clamps.
400L and 400L2 pumpheads set-up
The 400L is designed for 1.6mm wall elements up to 4.8mm bore, whereas the 400L2 accepts two 1.6mm wall
continuous lengths of tubing up to 4.8mm bore.
Care should be taken to establish the normal tube life experienced within a set of operating parameters. Subsequent
tubing replacement should be scheduled within the normal expected life of a tube. This will avoid unnecessary tube
failure and unplanned pump maintenance.
Tube loading (Pictures 1-24)
 Remove the transparent guard
 Release the track by disengaging the track occlusion pin.
 Before tube loading, make sure that enough suction and delivery tubing is available to connect into the remaining
pipeline or to reach the suction reservoir and delivery point.
 For 400L Y elements (pictures 1-9) locate one Y connection into the lower clamp block and feed the elements
around the split rotor ensuring that each leg of the element sits centrally over each section of the rotor. Locate the
second y connection in the upper clamp block.
 For 400L2 continuous tubing lengths (pictures 10-24) locate the tubing into the suction side w-block clamp.
Feed each tube in around the rotor, maintaining reasonable tube tension so that each tube sits centrally over each