Watson-Marlow 114DV pumphead: operating instructions 4
3.5 Tube holder
positioning
The pumphead can be adjusted to accommodate
1.6mm wall tubing in sizes from 0.5mm bore to
4.8mm bore.
Inner position, for small tubing
Outer position, for large tubing
With the smaller bore tubes of 0.5mm, 0.8mm and
1.6mm the inner position must be used to prevent
the risk of tube slipping through the clamps and
wandering across the rollers causing premature
tube rupture.
With the larger bore tubes of 4.0mm and 4.8mm
the outer position must be used to prevent the flow
rate being excessively reduced.
For tubing bores of 2.4mm and 3.2mm either
setting may be used, as appropriate for the
application. The inner setting will clamp the tube
harder, reducing tube slip but has the potential to
marginally reduce flow rate. The outer setting will
optimise flow rate but the risk of tube slip is
increased.
The tube holder is factory pre-set to the outer
position.
Tube holder position
Tube bore size 0.5mm 0.8mm 1.6mm 2.4mm 3.2mm 4.0mm 4.8mm
Inner
Outer
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