Cleaning
The pump cavity, impeller and drain piston may be cleaned, using a stiff brush to
remove stubborn deposits. The drain assembly and impeller may also be left to
soak overnight in a cleaning agent, such as “Decon 90", if necessary.
#
Warning
‘O’ ring seals
Before reassembling the unit you are advised to check the condition of the two
‘O’ rings (Ç and È). The ‘O’ rings can be removed by levering them out using a
pair of tweezers. Fitting the ‘O’ rings is the reverse of the above procedure.
Replacement ‘O’ rings can be obtained from Malvern Instruments.
Reassembly
Reassembly is the reverse order to disassembly. Ensure that the impeller
(É above) is secure on the motor shaft and that the three bolts (Ä above) in the
drain assembly are tightened evenly. When fitting the main body of the
Dispersion Unit to the drain section, make sure that the drain lever is rotated
fully forward À, and the drain tube Á is emerging from the rear of the Unit and
the drain lever  is to the right of the unit.
The Controller Unit and motor assembly must not be immersed. They
contain electrical components.
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ILL 3090
CHAPTER 9
QS Small Volume Sample Dispersion Unit
Page 9.4
MAN 0161
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