Varian 450-GC, User Manual

Page: 100 / 205

Injectors – 1177 Split/Splitless Capillary Injector
Page: 160 User Manual 450-GC Varian, Inc.
1177 Manual Pneumatics
The total flow into the system is adjusted using a 0–800 mL/min manual flow
controller. The 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 of the split vent
relative to the flow through the column is defined as the split r atio.
In the splitless mode, gas does not flow through the split line from the Injector to
the 3-way solenoid valve (see Figure 21). 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 1177 Injector
The following section describes how to operate the 1177Split/Splitless Capillary
Injector with the Varian 450-GC. 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 t he various modes of
injection.
Column Installation
The “Connect Capillary Column to Injector ” on page 15 procedure describes the
installation of a capillary column in a Varian 450-GC equipped with an 1177
Injector. Each step of the procedure is described in detail.
Condition the Column
For conditioning the capillary column see “ Column Installation and
Conditioning” on page 23.
Column Installation in Detector
For connecting a capillary column into a detector, see “ Connect Capillary
Column to Detector ” on page 24.