Inlets and valves
6850
6850
Released: April 2004 6850 Series Gas Chromatograph Service Procedures 120
1. On the keyboard, turn off pressure to the
inlet being tested.
Press [Front Inlet] or [Back
Inlet], scroll to the Pressure field and
press
[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.
3. Replace the inlet’s plumbing block with the
leak test block (part no. G1530-20660) from
the leak test kit (part no. G1530-60960).
Make sure you install O-rings (if needed)
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
and split vent flow paths on the module. It
allows the carrier gas, septum purge, and
split vent line to function normally as if an
inlet were present.
4. Perform the normal leak test for the EPC
inlet as described previously in this section.
With the inlet removed, the internal volume is
quite small and a pressure loss of 0.5 psi or
less in 5 minutes time is considered to be
leak free.
5. If there is a leak, you will probably need to
remove the flow module to try to isolate the
leak as described in the following Locating
leaks on the flow module procedure.
6. If there is an increase in pressure, see the
following Forward pressure valve leaks
procedure.
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