7. Maintenance
54
Replacement of pump tube
The pump tube may deteriorate over time. Replace it as appropriate.
The initial flow rate by pump is approximately 7mL/10 sec. As pump tube
deteriorates, flow rate goes down, and eventually sample liquid may leak. If
sample leaks from tube end, the tube must be changed with new one.
Follow the below instruction to change pump tube.
1
Remove the cassette.
z
Remove the tubes connected to
cassette.
z
Turn the cassette to the left and
pull it toward you.
Turn counterclockwise
to remove
Pump tube
cassette
2
Remove the tube.
z
Hold one end of tube joint and
pull it toward you. (As the
arrow indicates the way how it
is removed.)
Rotor
Pump tube
cassette
Pump tube
Tube joint
3
Apply grease.
z
Apply the supplied grease
around the new tube and axle
of cassette.
Apply grease
Pump tube
Axle of rotor
4
Fit pump tube.
z
Fit the new pump tube onto the
rotor.
To fit, draw the rotor toward
you as shown in figure.
The tube joint must be pushed in
securely along the groove.
Rotor
Tube joint
Pump tube
Pull out
5
Fit in the cassette.
z
Align the axle and rotor, and
turn to the right until it stops.
Axle
Match
Pump tube
Fix the cassette by
turning clockwise
until it stops.
Note
Some liquids cannot be used or may deteriorate pump
tube earlier. Study sample character and determine
when to change the pump tube.
Summary of Contents for DA-640
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