13. Inspect the instrument’s plumbing looking for obvious damage. Check the condition of fittings,
particulate filter housing plus the O rings both in the filter assembly and in the cell assembly.
14. If the leak is still present divide up the pneumatic system into discrete sections to locate the leak
(refer to Section 9.5). When the location of the leak has been determined repair and then rerun
the leak check procedure.
15. Open - Main Menu Service Menu Diagnostics Menu Valve Menu.
16. Toggle Off – Sample/Cal Off (this is done to release the vacuum safely)
17. Allow one minute for the system to equalise even when your gauge is back at ambient (residual
vacuum will still be in sections of the system. Remove the blocker on the BGnd Air Port and
Inspect the internal tubing to ensuring that the tubing is cleanly connected to the fittings and
that the internal Teflon lining has not been kinked or crumpled.
18. Remove the leak check jig.
19. Enable - Valve Sequencing Enabled.
6.3.6 Replacing the PMT Desiccant Pack
The PMT housing contains two desiccant packs to prevent condensation on the PMT cold block
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 instrument is switched off.
Once the instrument is switched off it is very important to cover the PMT at all
times so that no direct light reaches its window.
Equipment Required
Phillips Head Screwdriver
New Desiccant Packs
Tweezers
Procedure
1. Turn the instrument off and disconnect the power. Wait 15 min for the cold block to warm up.
2. Using a Phillips head screwdriver, remove the desiccant pack access cap from the PMT housing.
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