CP-3800 GC Operator’s Manual
57
CP-1177
Manual
Pneumatics
The total flow into the system is adjusted using a 0–800 mL/min manual flow
controller. The CP-1177 Injector uses a flow controller to supply the total flow
into the system with a back pressure regulator to control the column head
pressure. When the injector is operated in the split mode the flow out the
spilt vent relative to the flow through the column is defined as the split ratio.
In the splitless mode, gas does not flow through the split line from the injector
to the 3-way solenoid valve (see diagram below). Rather, gas from the flow
controller by-passes the injector to pass through the 3-way solenoid valve.
The back pressure regulator uses this flow to control column head pressure,
which in turn controls carrier gas flow through the column.
Operation of the CP-1177 Injector
The following section describes how to operate the CP-1177Split/Splitless
Capillary Injector with the Varian 3800 Gas Chromatograph. It is separated
into a series of procedures, starting with installation of a column and basic
programming of the injector from the keyboard, followed by detailed
information on the various modes of injection.
Column
Installation
The following procedure describes the installation (or reinstallation) of a
capillary column in a Varian 3800 GC equipped with a CP-1177 injector.
Each step of the procedure is described in detail:
Prepare the
Injector end
of the
Column
Refer to Figure 8 when preparing the end of a capillary column for
installation into the CP-1177 injector.
Figure 4 1079 Injector Capillary Installation
1
Capillary column nut
2
End of fused silica column
3
Capillary column ferrule
4
Properly cut column end
5
Improperly cut column ends
C
OLUMN
F
ERRULE
S
ELECTION
T
ABLE
F
ERRULE
ID C
OLUMN
ID
0.4 mm
250
µ
0.5 mm
320
µ
0.8 mm
530
µ
3
4
5
1
2
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