Agilent Technologies 6890 Series, Service Manual, Page: 81 / 867

220 Purged/Packed Inlet
Leak testing—EPC and manual inlets
12 of 20
Jun 2001
Inlets
Agilent 6890 Gas Chromatograph Service Manual
Performing the leak test—EPC inlets
Note Be sure to complete all of the preparation steps on pages 10 and 11 before
continuing.
1. Make sure a length and diameter for a capillary column are entered for
the inlet you are testing.
Press [
Column 1
] (or [
Column 2
] ) and enter a length and diameter in
the “Dim” row. This places the system in pressure control mode rather
than in flow control mode.
2. Set the pressure to 25 psi on the keypad.
Press [Front Inlet
]
or [Back Inlet
]
and enter “25” in the “Pressure”
field.
3. Wait approximately 15 seconds for equilibration.
If pressure cannot be achieved, either a very large leak is present in
the system, or the supply pressure is not high enough.
4. Turn the inlet pressure “Off.”
Press [Front Inlet
]
(or
[
Back Inlet
]
), scroll to the “Pressure” field,
and press
[Off
]
.