Watson-Marlow 604S/R - Manual (Page 8)

Page 8
Tube loading
Switch off the pump and isolate it from the mains supply before loading
tubing. If the pump is not switched off before the pumphead guard is
raised, a switch on the guard will cut off power to the motor. This
switched guard is a safety back-up system and must not be used as the
primary on/off switch for the pump.
The 604S/R is fitted with a spring loaded twin roller pumphead designed for
tubing with a nominal wall thickness of 3.2mm and bore sizes of between
4.8mm and 15.9mm. The pumphead is fixed in one position. A length of
410mm of tubing is needed for the pumphead. Open the pumphead guard
and fit one end of the tube into the bottom adjustable clamp. Tighten the
lower serrated adjustment wheel. Then, whilst rotating the rotor clockwise (a
spanner is provided for this purpose), feed the tube between the rollers and
the track, ensuring that the tubing is not twisted or stretched. This is
particularly important for the larger bore sizes of tubing. Fit the other end of
the tube into the top adjustable clamp, ensuring that the tube is not slack in
the pumphead. Clamp the tube very firmly by turning the upper serrated
adjustment wheel. Remove the spanner and close the guard.
Tubing range
Pump performance depends upon the accuracy and consistency of the
tubing. All Watson-Marlow tubing is specifically formulated for peristaltic
pumping, and is manufactured and quality controlled to our own
specifications. We recommend Marprene tubing whenever it is chemically
suitable. The Product Codes for the range of tubing suitable are listed below.
Tubing for 603R pumphead
Bore Tube
mm " # Marprene Bioprene Silicone Neoprene
4.8 3/16 25 902.0048.032 903.0048.032 910.0048.032
6.4 1/4 24 902.0064.032 903.0064.032 910.0064.032 920.0064.032
9.6 3/8 122 902.0096.032 903.0096.032 910.0096.032 920.0096.032
12. 1/2 186 902.0127.032 903.0127.000 910.0127.032 920.0127.032
15.9 5/8 184 902.0159.032 903.0159.000 910.0159.032 920.0159.032
Bore Tube
mm " # Butyl Tygon Viton
4.8 3/16 25 930.0048.032 950.0048.032 970.0048.032
6.4 1/4 24 930.0064.032 950.0064.032 970.0064.032
9.6 3/8 122 930.0096.032 950.0096.032 970.0096.032
12. 1/2 186 930.0127.032 950.0127.032 970.0127.032
15.9 5/8 184 930.0159.032 970.0159.032
Adjustment of the pumphead rollers
The two spring loaded rollers compensate for tolerance variations in the wall
thickness of tubing, eliminating the manual adjustment normally required by
peristaltic pumps, and, in general, there should be no need for the gap setting
between the rollers and track to be adjusted.
Should it ever appear that the roller arms are not equally adjusted, the original
factory setting of 5.2mm can easily be restored. There is an adjustment screw
on each of the two roller arms. Turn each screw anticlockwise until both
rollers are just in contact with the track, and then turn each screw clockwise
by five turns. Correct and equal adjustment is important. Over-occlusion will
reduce tube life. Under-occlusion will reduce pumping efficiency.