ReNu 20, ReNu 60 or ReNu 120
IMPORTANT: Set the pressure valve to the ‘in-use’ position before
installing the pumphead.
In ‘Transportation position’ Leak detector will not function with
discharge pressure below 1 bar (15 psi).
ReNu 30:
IMPORTANT: For food and beverage applications requiring FDA or
EC1935 certification replace the existing FKM (Viton
®
) O ring seals (2
off) with the EPDM O ring seals supplied.
Ensure the chemicals to be pumped are compatible with the
pumphead and the pipework and fittings to be used with the pump.
Please refer to the chemical compatibility guide which can be found at:
www.wmftg.com/gb-en/range/watson-marlow/chemical-metering/.
If you need to use the pump with any other chemical please contact
Watson-Marlow to confirm compatibility.
10.2
Do's and do not's
Do
operate the pumphead with the pressure switch in the 'in use' position—(Qdos20,60 &
120 only).
Do
remove and replace a ReNu pumphead immediately after a tube failure and leak detect
signal from the pump.
Do
keep delivery and suction tubes as short and direct as possible - though ideally not
shorter than one metre - and follow the straightest route. Use bends of large radius: at
least four times the tubing diameter. Ensure that connecting pipework and fittings are
suitably rated to handle the predicted pipeline pressure. Avoid pipe reducers and lengths of
smaller bore tubing than the pumphead section, particularly in pipelines on the suction
side. Any valves in the pipeline must not restrict the flow. Any valves in the flow line must
be open when the pump is running.
Do
use a proprietary non-return valve in the discharge line of the pump.
Do
use an over-pressure/ pressure relief valve within the process line as described in
"Installation instructions" on the previous page.
Do
use suction and delivery pipes with the largest diameter bore tube that will fit with
your process, especially when pumping viscous product. Care should be taken when
pumping solids in suspension as large bore tubes will reduce the fluid velocity, this may
lead to solids dropping out of suspension.
Do
site the pump at or just below the level of the fluid to be pumped if possible. This will
ensure flooded suction and maximum pumping efficiency.
Do
run at slow speed when pumping viscous fluids. Flooded suction will enhance pumping
performance, particularly for materials of a viscous nature.
Do
recalibrate after changing pumphead, fluid, or any connecting pipework. It is also
recommended that the pump is recalibrated periodically to maintain accuracy.
Do
ensure your PROFIBUS pump is installed in accordance with PROFIBUS installation
guidelines.
Do
avoid tight bends in the PROFIBUS signal cable.
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