Watson-Marlow 504U/RL - Manual (Page 3)

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There are dangerous voltages (at mains potential) inside the pump. If access is required, isolate
the pump from the mains before removing the cover.
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DO keep delivery and suction lines as short as possible using a minimum number of swept bends.
DO use suction and delivery pipelines with a bore equal to or larger than the bore of the tube fitted in the
pumphead. When pumping viscous fluids, the losses caused by increased friction can be overcome by using
pipe runs with a cross sectional area several times greater than the pumping element.
DO run at a slow speed when pumping viscous fluids. When using the 501RL pumphead, a 4.8 or 6.4mm bore
tube with a 1.6mm wall will give best results. Tube smaller than this will generate a high friction pressure loss, so
reducing the flow. Tube with a larger bore will not have sufficient strength to restitute. Flooded suction will enhance
pumping performance in all cases, particularly for materials of a viscous nature. For improved performance with
viscous materials or for lighter suction lift and discharge pressure use 2.4mm wall tubing in the 501RL2 pumphead,
for speeds up to 200rpm.
DO keep the track and rollers clean.
DO fit an extra length of pump tube in the system to enable tube transfer. This will extend tube life and minimise
the down time of the pumping circuit.
The self-priming nature of peristaltic pumps means valves are not required. Any valves fitted must cause no
restriction to flow in the pumping circuit.
When using Marprene or Bioprene tubing, after the first 30 minutes of running, re-tension the tube in the
pumphead by releasing the tube clamp on the delivery side a little and pulling the tube tight. This is to counteract
the normal stretching that occurs with Marprene and Bioprene, which can go unnoticed and result in reduced tube
life.
Tube selection The chemical compatibility list published in the Watson-Marlow catalogue is only a guide. If in
doubt about the compatibility of a tube material and the duty fluid, request a tube sample card for immersion trials.
Installa Installa Installa Installa Installation tion tion tion tion
The 504U/RL is suitable for single phase mains electricity supplies only.
To ensure correct lubrication of the gearbox the pump should be run only while its feet are standing on a horizontal
surface. The pump should be positioned to allow a free flow of air around it.
• Remove the small transparent plate on the rear panel to gain access to the voltage selector and terminal
block.
• Set the voltage selector switch to either 120V for 100-120V 50/60Hz single phase AC supplies or 240V for
220-240V 50/60Hz single phase AC supplies.
• Route the mains supply cable through the entry point to the right of the recess and couple the cable to the
terminal block as shown on the rear panel.
• The cable entry accepts three core 0.75 square millimetre PVC sheathed mains cable (via the screw adaptor
supplied) so that a mains lead can be used.
• Ensure that the mains lead is securely retained in the strain relief gland so that IP55 ingress protection is
maintained.
• Securely replace the transparent plate and the gasket over the recess.
1 Power cable 5-8mm O.D. (outside diameter)
2 Strain relief gland SL 0020
3 Adaptor MR0678T
4 M20 Conduit thread for direct conduit connection, through
back panel