Watson-Marlow 720DuN User Manual
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28.2 720R, 720RX, 720RE, 720REX
key safety information
Ensure that the pump is isolated from mains voltage.
Ensure that there is no pressure in the pipeline.
If a tube failure has occurred, ensure that any product in the pumphead has
been allowed to drain through the controlled waste to a suitable drain.
Ensure that protective clothing and eye protection are worn if hazardous prod-
ucts are being pumped.
28.3 720R, 720RX, 720RE, 720REX
safe-guarding
Primary safety on 720 series pumps is provided by the tool-lockable pumphead
track. Secondary (backup) protection is provided in the form of an electrical
guard switch which stops the pump if the pumphead track is opened. The
electrical track switch on cased pumps should never be used as primary
protection.
Always disconnect the mains power supply to the pump
before opening the pumphead track.
28.4 All 720R and 720RE
pumping conditions
All pressure values in this operating instruction, from which performance and
life figures have been calculated, relate to peak pipeline pressures.
Although rated to 2 bar peak pressure, this pump will generate in excess of 2
bar peak pressure if pipeline restrictions are in place. In instances where it is
critical that a peak pressure of 2 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.
28.5 All 720R and 720RE pumpheads:
fluid management
The foot assembly has a location available for a float switch leak detector to be fit-
ted. It has an M25 blanking plug on both sides of the foot. One or both can be
removed using a 10mm A/F Allen key to facilitate draining. It has an M12 blanking
plug on the outer face of the foot, which can be used as a drain if a leak detector is
fitted, to allow the fluid level to trigger the switch.
Before opening the pumphead track please
ensure that the following safety directions are
followed.
