Tube Loading; Fitting Double-Y Tubing Elements - Watson-Marlow 505LA Manual Del Usuario

14 505L Tube loading
Tube loading instructions are given for the three possible methods of using a 505L pumphead.
For most dispensing, and any application where there must be minimal pulsing, the use of
Watson-Marlow double- Y silicone tubing elements is recommended. These are pre- formed to the
correct length and merge two out-of-phase flows into a single smooth output. These elements fit on the
bayonet-style retaining pegs supplied with the pumphead.
In certain circumstances it may be useful to run two separate inlet tubes from your source to the
pumphead. It is advisable to do this if the fluid is particularly viscous and the single inlet tube is found to
restrict the flow rate, or if the pump is situated a long distance from the source reservoir and is running
at high speed. A tube clamp set is available from Watson-Marlow (contact your local Watson-Marlow
representative) to securely fix twin inlet tubes.
The 505L may also be used as a two-channel, six-roller, precision pumphead, with two entirely separate
tubes. The tube clamp set contains two clamps for each suitable size of tubing to enable both the inlet
and the delivery side to be secured. It should be noted that, when used in this way, the flow does not
benefit from the smoothing created by combining two out- of- phase flows, and slight channel- to-
channel variation may be found in the flow rates. Keeping suction and discharge tubing lengths the
same will minimise this variation.
14.1 505L: Fitting double-Y tubing elements
If using a standard element of any size:
Lift the two levers at either side of the pumphead and remove the track.
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Stretch the tubing element slightly and locate it over the mushroom pegs either side of the
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pumphead.
Replace the track and secure it by closing the two levers.
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Ensure the braided earth lead is securely connected to both the track and pumphead body.
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24 PB0379:m-505atex-en-04