Watson-Marlow 720DuN User Manual
16
9 Good pump installation practice
9.1 General recommendations
Position
A correctly engineered installation will promote long tube life. Site the pump on a
flat, horizontal, rigid surface, free from excessive vibration. Allow a flow of air
around the pump to ensure that heat can be dissipated. Ensure that the tempera-
ture around the pump does not exceed 40C.
Do not stack other 720 pumps on top of this pump. It is, however, acceptable to
stack other equipment on the upper surface of the 720 (as long as the ambient tem-
perature does not exceed 40C).
Emergency disconnection
The pump’s mains plug is the disconnecting device (for isolating the motor drive
from the mains supply in an emergency). Do not position the pump so that it is
difficult to disconnect the mains plug. The
STOP
key on the keypad will always stop
the pump. However, it is recommended that a suitable local emergency stop device
is fitted into the mains supply to the pump.
Valves
Peristaltic pumps are self-priming and self-sealing against backflow. No valves are
required in inlet or discharge lines. Valves in the process flow must be opened before
the pump operates. Users are advised to fit a pressure relief device between the
pump and any valve on the discharge side of the pump to protect against damage
caused by accidental operation with the discharge valve closed.
The pump may be set up so that the direction of rotor rotation is clockwise or
counter-clockwise, whichever is convenient.
Tubing materials: run-in advice
Sta-Pure and Marprene tubing are hard to compress when new. When using
tubing made of these materials, the first 30 seconds should be at a speed of 10 rpm
or greater. If the pump is run slower, the safety system built into pump drive’s soft-
ware may cause it to stop and display an over-current error
message.
Connecting pipework
When using elements in a 720RE or 720REX pumphead, ensure that at least 600mm
(2ft) of the connecting pipework rises as it approaches the pumphead on both the
inlet and discharge sides. This helps the sliders which hold the element in place to
find their optimum position. Failure to do this may result in premature element fail-
ure.
