PGC5000
PGC5000 Series Service Instructions
7 Subassembly repair
SI/PGC5000-EN, Rev B
52
7 Subassembly repair
7.1 Column repair
7.1.1 Column removal
1. If analyzer is running and a column is to be replaced, stop the analysis.
2. Reduce Isothermal Oven temperature by reducing oven air pressure to zero psig.
3. Wait for columns to cool to room temperature
4. Power down analyzer.
5. Shut off all utility gases (carrier(s), burner air and hydrogen fuel, as applicable).
6. Open isothermal oven door.
7. Note column connections.
Mark capillary columns with white-out at the back of the tubing nut before removing to insure correct
insertion depth of replacement column.
8. To remove the column, loosen the fittings on both ends of the column and gently extract the column from the respective
fitting connections.
9. Loosen any screw securing the column to the column mounting brackets and remove the column.
7.1.2 Packed column installation
1. Install the column, orienting it in such a way that each end can be connected to the fittings without restricting operation of
the analytical valves installed.
2. Fasten and secure column in place at the column mounting bracket with the retaining screws.
3. Insert the column end into the appropriate fitting connection and finger-tighten the nut, then tighten it an additional 1/4
turn.
4. Apply carrier gas and leak check. Further tighten the two fittings as necessary if leaks are found.
5. Close and secure the Isothermal Oven door.
6. Apply air and makeup gases.
7. Allow zone temperatures to stabilize.
8. Check/set carrier flows per data sheet.
7.1.3 Capillary column installation
Inspect the ends of the column. The ends should be round and burr free. If either column end is not round or burr free, the
column end must be trimmed as described in “Cutting capillary columns.”
1. Insert the end of the column through the back of the tubing nut.
2. Insert the column through the new ferrule.
3. Slide the ferrule down the length of the column (approximately three inches).
4. Cut the column as described in "Cutting Capillary Columns."
5. Connect the column and finger-tighten; then tighten and additional ¼- turn with an open-end wrench.
6. Test the column for a secure connection by gently pulling the column at the 1/8-inch tubing nut. Correct any withdraw.
Continue tightening the nut until the column is secure at the fitting.
7. Repeat steps 1 through 6 for the other end of the column.
8. For columns connected to an FID:
a. Insert the column end into the FID analysis inlet connection until it stops against the jet.
b. Withdraw the column approximately 1/16-inch and tighten the nut finger-tight. Tighten the nut an additional 1/4-turn
with an open-end wrench.
c. Check it for a secure fit.
If a metal capillary column is used, particular care should be taken to ensure that the column does not
contact the jet. The metal column will conduct electricity and could cause an electrical short at the jet.
9. Turn on carrier gas
