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Watson-Marlow 620DuN and 620Du User Manual 103
33.3 620L and 620LG pumping conditions
Pressure and viscosity
All pressure values in this operating instruction, from which performance and
life figures have been calculated, relate to peak pipeline pressures.
Although rated to 4 bar peak pressure, the 620LG may generate in excess of 4
bar working pressure if pipeline restrictions are in place. In instances where it
is critical that a working pressure of 4 bar is not exceeded, pressure relief
valves should be installed in the pipeline.
Ensure that there is always a minimum of one metre of smooth bore flexible
tubing connected to the discharge port of the pumphead. This will help
minimise any impulse losses and pulsation in the pipeline. This is especially
important with viscous fluids and rigid pipework.
33.4 620L and 620LG
removal and installation
A 620 pump supplied with a 620L pumphead is not intended for use with any other
pumphead. However, the pumphead can be removed for cleaning or maintenance.
620L 0-2 bar Y element or continuous tubing
620LG 0-4 bar Sta-Pure and Chem-Sure Y elements only
Always isolate the pump from the mains power
supply before opening the guard or performing
any positioning, removal or maintenance.
Always isolate the pump from the mains power
supply before opening the guard or performing
any positioning, removal or maintenance.