7 of 46
Jun 2001
Inlets
Agilent 6890 Gas Chromatograph Service Manual
Programmed Temperature Vaporization Inlet (PTV) 240
Splitless modes
gang fitting on the flow manifold. Flow control is the same as for the septum
head.
Figure 240-3 Splitless mode flow control diagram: sample injection
After the injection, the solenoid valve opens and the flow control is the same
as during split mode operation. See Figure 240-1 (or Figure 240-2).
SPR
vent
Split
vent
SPR
PS
FS
PV1
PV2
Flow
limiting
frit
Column head
pressure
control loop
Cryo
valve
To de te ct or
Septum
holder
Tr a p
Te m p e r at u r e
conversion
board
Valve
closed
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