Watson-Marlow 323Dz - Manual (Page 15)

Watson-Marlow 323Dz User Manual 15
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 temperature around
the pump 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. Please note, however, that with a 501RL
pumphead tube life will be greater if the rotor rotates clockwise; and that perform-
ance against pressure will be maximised if the rotor rotates counter-clockwise.
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.