Watson-Marlow 521CC - Manual (Page 24)


Feed the tubing around the pumphead track, turning the rotor as necessary. Make sure
the tubing is not twisted. Ensure that the second 225mm mark is adjacent to the inner
edge of the upper tube clamp.

Open the upper spring-loaded tube clamp and locate the tubing into it, making sure there
is no residual twist in the tubing, and that the tube sits centrally between the tube guide
rollers. Release the clamp.

The spring-loaded tube clamps must grip the tubing tightly enough to stop it moving in
and out of the pumphead but must not over-squeeze the tube and throttle fluid flow. The
tubing clamps are fitted with yellow sliders which can be clicked into two positions while
the clamps are held open: the outer position will allow the clamps to grip the tube
tightly; the inner will grip the tube loosely. Adjust the sliders to prevent tube movement
during a few trial rotations of the rotor.

Close the guard, pushing it fully home until the latch engages.

Connect suitable pipework to the pumphead tubing using appropriate connectors.

Remember, when using Marprene or Bioprene tubing, re-tension the tubing after 30
minutes of running, as it may grow in length as it beds in. Re-tension so that 225mm of
tubing sits between the inside faces of the spring-loaded parts of the tube clamps.
Page 24 of 47 Watson-Marlow Bredel E-Manuals
14/12/2009 file://M:\staging\pdfs-global\m-521-cc-gb-03.htm