Septumless Head Installed - Agilent Technologies 6890 Series Service Manual

240 Programmed Temperature Vaporization Inlet (PTV)
Split modes
The temperature of the liner can be held below or above the boiling point of
the carrier solvent.

Septumless head installed

In the septumless head, the flows are the same as in the septum head, except
the septum purge vent is bypassed directly to the carrier flow through the
gang fitting on the flow manifold. Flow control is the same as for the septum
head. See Figure 240-2.
Flow
Total flow
limiting
control loop
frit
Figure 240-2
4 of 46
Split
SPR
vent
vent
SPR
PS
Valve
PV2
open
FS
PV1
Temperature
conversion
board
valve
Split mode flow control diagram (septumless head installed)
Inlets
Agilent 6890 Gas Chromatograph Service Manual
Septumless
Trap
head
Cryo
To detector
Jun 2001