Watson-Marlow 205S User Manual
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Recommended operating procedures
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 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 205S and 205U are 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.
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.
205S / 205U Manual operation
Press the Man/Auto key (205U). When the AUT symbol is not flashing the pump is in manual mode.
Change the set speed by pressing the
or key. The 205S & 205U speed control ratio is 180:1.This will give a
minimum gearbox speed of 0.5rpm and a maximum of 90rpm.
Change direction by pressing the CW/CCW key. Check the flashing CW/CCW symbol for actual direction setting
(CW: clockwise CCW: counter clockwise).
Select the maximum speed: press the
key and the Max key together.
Select the minimum speed: press the
key and the Max key together.
Select the low pulse speed (approx 0.01rpm) indicated by "Lo" on the display by pressing the
key again. One
more press of the
key and the pump will stop and display 0.0rpm.
The keypad has a locking facility to avoid resetting or tampering. If the pump is stopped, press Stop until the
padlock symbol illuminates. If the pump is running, press Start until the padlock symbol illuminates. All keys will be
disabled except for Start and Stop. Press these keys until the padlock symbol extinguishes to unlock the keypad.
The pump can be set to automatically restart in its operating state set prior to interruption, or set so that after
power is reconnected the pump will remain stopped. To invoke the Auto-restart facility switch off power to the
pump at the mains supply. Press the Start key down when the mains supply is switched back on until the ! symbol
illuminates. Now press Start to start the pump. This facility can be cancelled by turning the mains supply off and
then pressing the Stop key whilst turning the mains supply back on. The ! symbol will not be illuminated.
Press Start to start the pump. Press Stop to stop the pump.