240 Programmed Temperature Vaporization Inlet (PTV)
Split modes
4 of 46
Jun 2001
Inlets
Agilent 6890 Gas Chromatograph Service Manual
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.
Figure 240-2 Split mode flow control diagram (septumless head installed)
SPR
vent
PS
SPR
PV1
PV2
Total f low
control loop
Flow
limiting
frit
To de te ct or
FS
Split
vent
Te m p er a t u r e
conversion
board
Cryo
valve
Septumless
head
Tr a p
Valve
open
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