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The example shown below is a splitless injection with EFC pneumatics. In
this case the injector is held in the split OFF state for a period of time at the
beginning of the run (the sampling time). The injector is then switched to the
split ON state, typically after 0.5 - 1.5 minutes, to vent the injector of any
residual solvent. After the injector has been vented, the split ratio can be
reduced to conserve carrier gas. In this example the split ratio is reduced to
5:1 after 1.5 minutes. The 1079 SPLIT STATE screen is accessed by
pressing the PAGE DOWN key on the 3800 keyboard until page 3 of 3 is
presented.
ACTIVE
METHOD
EDIT
METHOD
CTRL
RUN
TIME
END
TIME
01 2: %
,)#" 01 2: %
*" : -
01 2: %
,)#" 01 2: %
*" : -
- 34 5 6
- 34 5 6
*"
*"
*"
*"
"
"
-
-
-
-
3%
3%
-
-
%
%
-
-
%%
If the 1079 is equipped with manual pneumatics, the split state is
programmed in the VALVE TABLE section of SAMPLE DELIVERY. For
further information on this topic refer to the Sample Introduction section of the
3800 Operator’s Manual.
Page two of the 1079 method contains fixed parameters which are rarely
changed. These include turning on and off power to the injector heater and
the coolant supply to the injector.
