Varian 450-GC, User Manual

Page: 94 / 205

Injectors – 1177 Split/Splitless Capillary Injector
Page: 154 User Manual 450-GC Varian, Inc.
Features of the 1177 Injector
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The 1177 operates isothermally from 50 to 450 °C.
•
Changing from one injection mode to another typically involves a change of
Injector insert and a modification to the Injector and EFC program. Glass
inserts can be easily changed from the t op of the Injector.
•
The internal Injector temperature profile keeps the septum cool while
maintaining the point of injection at the setpoint temperature.
•
The 1177 uses positive septum purge to minimize the adsorption of sample
onto the Injector septum and to prevent contaminants from the septum
entering the column.
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The 1177 uses a unique dual split vent that allows effective sweeping of the
entire Injector body.
Automatic Start Switch
The automatic start switch is a spring loaded actuator that fits over and is
aligned with, the injection port of the 1177 Injector nut. The GC run is started
when the actuator is depressed by the syringe barrel, or manually pressed at
the moment of sample injection. The GC run can also be manually (only in local
automation) started by pressing the START .
The Injector nut and automatic s tart swit ch assembly may
be very hot during ins trument operation and should not be
touched with un protected hands.
1177 Injector Inserts
Click here to see the 1177 Injector Inserts, on page 448.
Note that all 1177 Injector inserts are deactivated for maximum inertness.