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Inlet Systems
Packed column inlet
105
10
20
30
40
60
70
80
90
50
50 100 150 200 250 300 350 400
Bottom of Sep-
tum
Syringe Tip
Base of Injection
Port
Temperature in Gas Stream —
C
35
C
Ove
n
150
C
Oven
300
C
Oven
Injection Port Setpoint
Temperature 350
C
Thermal Profiles
Figure 6-4
This optimized thermal profile allows very reproducible results and
virtually eliminates injection port discrimination against high boiling
point components. When combined with fast automated injection,
excellent quantitative accuracy is possible.
Septum purge
Best results are obtained by running a very low septum purge flow (1 to
2 ml/min. of purge flow is recommended•never more than 10% of column
flow rate). Once the purge flow has been set, it will remain constant,
regardless of changes in column head pressure or column flow rate. An
alternate septum nut is provided which allows operation without purge
flow if desired.