11. If the instrument did not leak then skip to step number 15.
12. Inspect the instrument’s plumbing looking for obvious damage. Check the condition of fittings,
sample filter housing plus the O rings both in the filter assembly and in the cell assembly.
13. When the location of the leak has been determined repair and then rerun the leak check
procedure.
14. Inspect the tubing again ensuring that the tubing is cleanly connected to the fittings and that the
internal Teflon lining has not been kinked or crumpled.
15. Remove the leak check jig and Swagelok blocking nuts.
16. Re-enable valve sequencing from the Valve Menu.
6.4.6 Replacing the PMT Desiccant Pack.
The PMT housing contains two desiccant packs to prevent condensation on the cooled PMT housing.
If the desiccant expires it will result in corrosion and premature cooler failure. It is recommended
that the desiccant bags be changed at least annually. If moisture is detected inside the housing or the
desiccant packs are saturated the interval should be reduced. To change the desiccant packs follow
the instructions below:
CAUTION
Because the PMT is extremely sensitive to light, it is essential that before opening
the PMT assembly to make sure that the analyser is switched off.
Once the analyser is switched off it is very important to cover the PMT at all times
so that no direct light reaches its window.
1. Turn the analyser off and disconnect power.
2. Using a Phillips head screwdriver, remove the desiccant pack access cap from the PMT housing
(refer to Figure 57, label 1).
Figure 57 – Removing the reaction cell or desiccant pack
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