Watson-Marlow 323E, 323S, 323U and 323Du User Manual
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Tube loading
Tube size is identified by the colour of the three collars.
These collars divide the manifold tube element into two alternative pumping seg-
ments. Either segment may be fitted in the pump cassette and this doubles the work-
ing life obtained from each manifold tube element.
Tube elements should be inspected regularly, and moved to their second segment,
prior to failure. Ensure the tubing has not bonded to the cassette track. Check the
whole tube surface within the cassette.
Move the cam lever over to unlock the cassette. Lift the cassette from the track
and remove any tubing.
Slot one end of the new tubing segment into a cassette leg. Slot the other end
of the tubing segment into the other cassette leg. The collars must be outside
the cassette legs. Slide the tubing evenly down into the slots. Do not twist the
tube or use unnecessary force.
Slip the collars past the retaining fingers and ensure the tubing has reached the
bottom of the slots. Carefully pull the tube in towards the cassette to fix the col-
lars in position.
Drop the loaded cassette into the pumphead. Cassettes will fit in the pumphead
in either direction and we recommend they are all fitted in the same direction.
Push the cassette down until the cassette legs will hook into the pumphead
body. Ensure the tube has settled naturally into the cassette track and is not
pinched by the edge of the cassette.
Flip the cam lever upright to lock the cassette in the pumphead.
The cam lever controls the occlusion of the tube against the rollers. To pump
against higher pressure the cam lever may be moved beyond the vertical posi-
tion. Tube life will be shortened and drive torque will be increased. This will re-
duce the number of cassettes that may be fitted to the pump.
