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8.2.6 Peristaltic Pump – Fig. 8.1
It is recommended that the pump tubing and pump capstans, supplied in the Consumable Spares Kit, are replaced after one year of
operation. Carry out the following procedure 1 to 8:
If required, fit new pump tube
5
bungs and shims, from the kit, to
the left hand side of the pump.
Note. The bungs are
designed to grip the pump tube
when compressed by the
platen. Two sizes of tube are
used so it is essential that the
correct size of bung is fitted.
The sample tube, which is the
larger of the two, is fitted at the
front of the pump. It is important
that the shims are always fitted.
6
Pass new pump tubes, from the
kit, through the tube bungs and
case grommets. Connect to the
appropriate tube connector at the
rear of the case.
8.2.7 Replacement of Plumbing Tubing
All the following items are included in the Consumable Spares Kit.
a) Remove electrodes for short term storage.
b) Remove each section of the sample and reagent plumbing
tubing in turn and replace with new tubing of the same length.
c) Remove drain tubing and replace with new tubing of the same
length.
7
Locate the tubes centrally on the pump rollers.
Fig. 8.1 Peristaltic Pump
1
Remove the pump platen by turning the
catch mechanism to the vertical position
and pulling the catch forward.
Lower the pump platen, only from directly
8
above, on to the pump tubes until the
catch mechanism locates in the hole in
the case, and turn the catch lever to the
horizontal position.
Disconnect each pump tube from its
2
respective tube connector at the rear of
the case, pull through the grommets and
discard.
3
Remove the retaining screw on the pump
shaft and remove the capstans.
4
Fit all three new capstans, from the kit,
on the hexagonal shaft so the rollers are
offset from one another. Fit retaining
screw.
d) Using a syringe, clean constant head unit, solenoids and
sample heating coil in flowcell with sodium hypochlorite
solution.
e) It is recommended that the sample and drain tubing to and
from the monitor is inspected and replaced if the tubing is in
poor condition or shows evidence of any build-up of solids.
8 MAINTENANCE...
31
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