Leak Testing The Ptv Module Only - Agilent Technologies 6890 Series Service Manual

240 Programmed Temperature Vaporization Inlet (PTV)

Leak testing the PTV module only

Leak testing the PTV module only
Occasionally, to locate small leaks, you will need to isolate the EPC module
from the inlet weldment and leak test the EPC module separately.
1. On the keyboard, turn off pressure to the inlet being tested.
Press [Front Inlet] or
press
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 manifold to
try to isolate the leak as described in the following Locating leaks on the
flow manifold procedure.
6. If there is an increase in pressure, see the following Forward pressure
valve leaks procedure.
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[Back Inlet]
.
[Off]
Inlets
Agilent 6890 Gas Chromatograph Service Manual
, scroll to the Pressure field and
Jun 2001