Running a Sample
Setting Conditions
80
Setting the Carrier Gas Flow Rate for the G1883/G1290
Set the carrier gas flow as follows:
1. Set the following GC parameters:
2. Set the split flow to 4 ml/min. The GC total flow will read 11 ml/min.
3. With an electronic flow meter connected to the GC split vent, turn up the
headspace carrier gas flow until the flow rate out the split vent equals the
flow rate desired in the column. (Because the split ratio is 1:1, this flow
rate equals the column flow rate.) See Figure 14. Remove the flow meter.
Note that the GC and Headspace pressure readings should be similar.
Record the headspace pressure reading—you can use it to set up future
checkout runs.
Caution The added flow of the headspace sampler will cause the flow calculations of
the inlet to be incorrect. If your added flow and pressure exceed the limits of
the inlet, the GC may go “Not Ready.”
Inlet (Volatiles Interface or Split/Splitless)
Mode Split
Initial temperature Per method
Pressure Per method
Split ratio 1:1 (G1290)
Split flow 4 ml/min (G1290/G1883) at GC EPC
Gas saver Per method
Gas type Per method
Column
Mode Per method
Initial flow 4.0 ml/min
Initial pressure Per method
Outlet pressure Ambient (per detector)
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