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5. When the system is considered leak tight,
the caps may be removed, the column rein-
stalled, its dimensions configured at key-
board, and the desired pressure set.
Leak testing the EPC module only
Occasionally, to track down small leaks, you will
need to isolate the EPC module from the inlet
weldment and leak test the EPC module sepa-
rately.
1. Press Inlet, scroll to the Pressure field
and turn it off.
2. Use a Torx T-10 screwdriver to remove the
screw in the plumbing block on the front of
the module. Remove the plumbing block from
the EPC module, being careful not to lose the
O-rings between the block and the module.
Released: April 2004
3. Replace the inlet's plumbing block with the
4. Perform the normal leak test for the EPC
6850 Series Gas Chromatograph Service Procedures
leak test block (part no. G1530-20660) from
the leak test kit (part no. G1530-60960).
Make sure you install O-rings between the
block and the EPC module to create a seal.
The leak test block is a special fitting that
plumbs the carrier gas coming out of the
module directly back into the septum purge
flow path on the module. It allows the carrier
gas and septum purge to function normally
as if an inlet were present.
inlet as described previously in this section.
With the inlet removed, the internal volume is
smaller and a pressure loss of 1.0 psi in
10 minutes is considered leak tight.
85
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