Watson-Marlow 403U - Manual (Page 9)

9
Tube re-tensioning (pictures 25-27)
 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 upper w-block clamp and pulling the tubing on the delivery side a little. This
is to counteract the normal stretching that occurs with Marprene which can go unnoticed and result in poor tube
life.
25 26 27
Tube removal
 Release the track by disengaging the track occlusion pin and withdraw the tubing from the w-block clamps.
400VM2, 400VM3, 400VM4 pumpheads set up
The 410VM pumpheads are designed to accept two bridge manifold tubing only.
Tube loading (pictures 1-8)
 Release the track by disengaging the track occlusion pin.
 Locate the first tube bridge into the appropriate tube bridge holder slot. Feed the tubing around the rotor and
locate the centre tube bridge into the bridge holder slot immediately opposite the first tube bridge. Repeat for the
remaining one (400VM2) or two (400VM3) or three (400VM4) channels. Make sure that there are no twists or
kinks in the tubing after loading as this will adversely affect tube life.
 Re-position each track over the rotor and fix by slotting the track occlusion pin back into the track slot.
 Compressing the spring on the track occlusion pin (picture 8) will increase the suction height and performance
against back pressure.
1 2 3 4
5 6 7 8
Tube removal
 Release the track by disengaging the track occlusion pin.
 Remove both tubing bridges from their location slots and remove the tubing from the pumphead.