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...8 MAINTENANCE
...8.2.7 Assembling/Refurbishing the Probe
Fitting the Probe – Fig. 8.1
When the Ammonia Probe has been prepared for use in
accordance with steps a) to h) proceed as follows:
i) Hinge down the temperature controlled block cover to gain
access to the block. Fit the assembled probe into the
recess in the temperature controlled block, ensuring that
the probe sits at the bottom of the recess. Rotate the
retaining clip to hold the probe in position. Do not touch the
delicate membrane with any hard or sharp objects.
j) With sample and reagents flowing, ensure that liquid is
delivered on to the membrane, flows over its surface and
drips off the lower edge of the probe end cap into the drain
recess, as shown.
k) Replace the cover on the temperature controlled block.
l) Connect probe lead to the coaxial socket above the
temperature controlled block.
Recess in
Block
Sample
Delivery
Tube
Probe Membrane
32
Probe Retaining Clip
Sample Delivery
and Drain Moulding
Sample Director Moulding
Fig. 8.1 Fitting the Probe
8.2.8 Peristaltic Pump – Fig. 8.2
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:
8.2.9 Replacement of Plumbing Tubing
All necessary items are included in the Consumable Spares
Kit.
a) Remove probe 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.
d) Clean the constant head unit, solenoid valves and sample
heating coil in the flowcell with a syringe filled 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.
Ammonia
Probe
Temperature
Controlled
Block
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