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Jun 2001
Inlets
Agilent 6890 Gas Chromatograph Service Manual
Split/Splitless Inlet 210
Manually controlled inlet
Manually controlled inlet
Split mode
For a manual inlet in split mode, V1 is a manually regulated mass flow
controller that controls total inlet flow. PCV is a three-way purge control valve
that remains in the normally open position to allow flow out of the split vent.
V2 is a manually controlled back pressure regulator in the split vent path
controlling the inlet pressure and thus, flow through the column. SPR is a
manually controlled septum purge regulator used to control the septum purge
flow. This flow is set to approximately 3.0 mL/minute for operation.
Figure 210-3 Manual control split mode flow diagram. 100:1 split ratio
Tot al Flo w
Control
Septum holder
Septum purge
regulator
Septum purge
3 mL/min
Inlet Vent Flow (split)
100 mL/min
Inlet pressure
control
Purge Control Valve
PCV
To D e tect or
1 mL/min Column Flow
1mL
/
min
104 mL/min
101 mL/min
100 mL/min
V1
V2
SPR
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