Watson-Marlow 704U - Manual (Page 3)

Watson-Marlow Bredel E-Manuals
http://www.watson-marlow.it/pdfs-global/m-704su-gb-03.htm[10/07/2012 14:21:14]
rigid pipework.
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 over-length pump tube in the system to allow its position to be varied relative to
the rotor. This will extend tube life and minimise the downtime of the pumping circuit.
Do ensure that connecting pipe work and fittings are suitably rated to handle the predicted
pipeline pressure.
If rigid pipe work comes in close proximity to the pumphead, a drop out section of pipe
work will simplify tube replacement.
Do keep the pumphead rollers and track clean.
If unsure of an installation please contact your local Watson-Marlow Technical Support
Office for further assistance.
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.
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.
7 Installation
The 704S and 704U are suitable for single-phase mains electricity supplies only.
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 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. Check rear panel for this information.
The 704S and 704U accept three-core 1.0 square millimetre PVC-sheathed mains cable
(via the screwed adapter supplied) so that a flying lead can be used. The 704S and
704U both accept 20mm rigid or flexible conduit.
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. Conduit adaptor
gland GR0018
2. Washer GR0019
3. Cable strain
relief gland
GR0031
Ingress protection standard will be compromised if the transparent plate
is not replaced.