Watson-Marlow 120U/D1 - Manual (Page 31)

Watson-Marlow 400D1, 400DM2 and 400DM3 pumpheads: operating instructions 3
3.4 400D1 tube
loading and removal
Release the track by disengaging the sprung
track 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.
Locate the tubing into the suction side tube
clamp. Feed the tubing in around the rotor,
maintaining reasonable tube tension so that the
tube sits around the rotor, and locate into the
delivery side tube clamp. Make sure that there
are no twists or kinks in the tubing after
loading as this will reduce tube life.
Ensure the tube is lined up centrally in the
track and correctly secured at each clamp.
Reposition the track over the rotor and fix by
slotting the track pin back into the track slot.
To remove the tube, reverse the sequence.
Note: over-tightening the sprung track pin can
damage the tube and the pumphead.
Tube re-tensioning
When using Marprene tubing: After the first 30
minutes of running, re-tension the tube in the
pumphead by releasing the sprung track pin
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.
Tube removal
Release the track by disengaging the sprung
track pin and withdraw the tubing from the
sprung clamps.
3.5 400DM2 and
400DM3 tube check
The 400DM2 and 400DM3 pumpheads are designed
to accept three-bridge manifold tubing only. Each
piece of three-bridge manifold tubing has two
pumping sections. Reduced flow performance in one
section is a sign of tube wear and should be used as
an indicator to switch over to using the second
section. When the switch to the second section is
made, check the first section of tubing is not
adversely affected by normal line pressure. If this is
the case then the complete section of tubing will
need to be replaced.
Always isolate the pump from
the mains power supply before
opening the guard or
performing any positioning,
removal or maintenance
activity.
00:30:00
Over-tightening the sprung
track pin can damage the tube
and the pumphead.