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• Proportional valve 1 in the inlet EPC module
is defective or not being controlled correctly.
If the pressure quickly approaches the supply
pressure, the leak is isolated to:
• The injection port body
• The 1/8-inch Swagelok fittings on the copper
split vent tube (one at the injection port, one
at the split vent filter)
• The split vent trap (check fittings and
O-rings inside)
• The O-ring that seals the "split" line in the
EPC gang fitting
Released: April 2004
• The gold seal/column fitting (if the large
• There could be a large internal leak in the
6850 Series Gas Chromatograph Service Procedures
retaining nut that holds the heated block in
place is nut fully tightened, it will limit the
travel of the smaller nut that holds the gold
seal, thereby creating a leak)
EPC module, although this is very unlikely.
See the test at the end of this section that
uses the 6850 Leak Test Kit to isolate leaks
internal to the EPC module.
Large retaining
nut for heated
block
284
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