Purged Packed Inlet; Replacing The Purged Packed Inlet - Agilent Technologies 7820A Service Manual

Purged Packed Inlet

Agilent 7820 GC Service
31
Reinstall the insulated thermal cup and insulation in the GC
oven.
Reinstall the inlet cover.
The purged packed column inlet controls column flow by means
of a forward pressure/flow, electronic proportional control valve.
A frit (restrictor) provides relatively constant flow out of the
septum purge vent. The inlet can be used for packed or capillary
columns. The inlet operates in mass flow controlled mode,
regardless of the column type installed or configured.

Replacing the Purged Packed inlet

1 Cool down the oven.
Turn off the GC main power switch and disconnect its power
cord.
Hazardous voltages are present in the
mainframe when the GC power cord is connected.
Avoid a potentially dangerous shock hazard by
disconnecting the power cord before removing
any GC panels.
Components can be damaged by static electricity:
be sure to wear an ESD strap grounded to the GC
chassis while performing this procedure.
Turn off all gas flows at their sources.