Watson-Marlow 505S - Manual (Page 3)

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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. Silicone and Marprene tubing is available with a 2.4mm wall thickness for speeds
up to 200rpm. (The rotor will require re-setting to a roller/track gap of 3.8mm.)
DO fit an extra length of pump tube in the system to enable tube transfer. This will extend tube life and minimise the downtime
of the pumping circuit.
DO keep the track and rollers clean.
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 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
which can go unnoticed and result in poor 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.
Installation
The 505S/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.
• Set the voltage selector to either 120V for 100-120V 50/60Hz supplies or 240V for 220-240V 50/60Hz supplies.
A mains cable fitted with a moulded plug is supplied with the pump. The wires are colour coded in accordance with the
following code:
• 220-240V: Live- Brown; Neutral - Blue; Earth - Green/Yellow.
• 100-120V: Live - Black; Neutral - White; Earth - Green.
Reduced voltage operation
In areas where voltage is below that specified above, modifications can be made to the pump unit to allow operation under the
following minimum voltage levels:
• 180V when using the 220-240V setting.
• 90V when using the 100-120V setting.
The modification requires the connector J18 on the Control PCB to be reversed. To locate the terminal, isolate the mains
supply then remove the pump cover. State A shows the standard voltage setting, whilst State B shows the reduced voltage
setting. Any damage caused to the pump in the process of carrying out this modification will not be covered by warranty.
Control PCB State A State B
Refer servicing to qualified personnel only.
Troubleshooting
Should the pump fail to operate, make the following checks to determine whether or not servicing is required.
• Check that the power switch is on.
• Check the mains supply is available at the pump.
• Check the voltage selector switch is in the correct position.
• Check the fuse in the mains socket.
• Check that the pump is not stalled by incorrect fitting of tubing.