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PGC5000
PGC5000 Series Service Instructions
7 Subassembly repair
SI/PGC5000-EN, Rev B
66
17. Slide the first cleaned
seal
over the
stem
using the “A” end of Seal Insertion Tool TL-791A006B. The 30° angle (pointed
end) of the
seal
must face the
Belleville springs
. Figure 7.11 shows the orientation of the seal.
Seal
Seal
Stem
Figure 7.11. Installing the Stem Seals
18. Slide the cleaned
sample chamber
over the
stem
onto the
seal
.
19. Slide the second cleaned
seal
over the
stem
using the “B” end of Seal Insertion Tool TL-791A006B. The 30° angled
(pointed end) of the
seal
faces out, away from the
sample chamber
. Figure 7.11 shows the orientation of the seal.
20. Lightly lubricate the threads on the
body
.
21. Retract the
stem
until it is flush with the front of the
seal
.
22. Screw the
body
into the
flange
against the
vaporizer chamber
until tight.
23. Push the
stem
into place.
24. The
sample chamber
should be loose in the assembly at this point. If not, back out the
tensioning nut
until the
sample
chamber
is loose. Use the end of a 0.156 Allen wrench in the slot of the tensioning nut to adjust to the point of
eliminating the longitudinal play of the sample chamber.
25. Tighten the
tensioning nut
in 24 1/4-turn increments (6 turns total) to load the
seals
.
26. Lightly lubricate the inside bore of the
cylinder
.
27. Align the fittings on the
cylinder
with the
sample chamber
tubes, or with air lines if servicing.
28. Slide the
cylinder
onto the
piston
and the
body
.
29. Install two
cone point set screws
into the
cylinder
and tighten into the groove on the
body
.
30. Reinstall tubing to the LSV, being careful to connect each line to the proper connection on the LSV.
31. Close the isothermal oven door.
7.6.3 Removing the LSV from the analyzer
1. Stop analysis at the end of a cycle.
2. Remove power from the analyzer.
3. Allow all temperature zones to cool, maintaining flow while the columns are cooling.
4. Turn off carrier, sample, and air to the analyzer.
5. Open the isothermal oven door.
6. Label all connections to the Liquid Sample Valve.
7 Disconnect all tubing from the Liquid Sample Valve.
8. Mark the analyzer and flange to ensure the flange is reinstalled in the correct orientation.
9. Remove the four screws holding the flange to the side of the analyzer.
10. Remove the Liquid Sample Valve to the workbench. The insulation and insulation retainer may move during LSV removal;
retain them for later installation.
11. Close the isothermal oven door.
7.6.4 Installing the LSV on the analyzer
1. Open the isothermal oven door.
2. Install the Liquid Sample Valve on the analyzer, making sure the insulation and insulation retainer are in the proper
location around the vaporizer.
3. Orient the flange so that the marks made at valve removal are lined up. This should have the sample chamber vertical,
with the air connections at the top of the valve and the connection of the vaporizer chamber at the top.
4. Install the four screws holding the flange to the side of the analyzer and tighten the screws.