5 Micro GC Channels
To disable backflush
Agilent 990 Micro GC User Manual 81
10 m Al2O3/KCl BF2D procedure
1 Set backflush (BF) time to 0 seconds. Run method to obtain the peaks of all eluted
components. Record the retention time (RT) of cis-2-pentene and n-hexane.
2 Set run time to a value which is 10 seconds longer than the RT of n-hexane. Set BF time to 5
seconds. Start a run.
3 Increase BF time by 0.5 seconds steps, and start a run. Observe the peak height of n-hexane.
Continue increasing BF time until the n-hexane peak is observed (peak height > 3 µV).
4 Finely tune the BF time, find the data point when the n-hexane peak is observed. Decrease BF
time by 0.1 seconds steps, and start a run until the peak disappears (peak height < 3 µV). Set
BF time for this channel to that value minus 0.4 seconds. A typical “clean cut” time range of
10m Al2O3 BF2D channel is approximately 1-2 seconds. (See Figure 33.)
To disable backflush
To disable backflushing, set the Backflush Time to 0. This puts the system in normal mode during
the entire run.
Table 24 10 m Al2O3/KCl BF2D settings
Parameters Settings
Column pressure 300 kPa
Injection temperature 100 °C
Column temperature 90 °C
Injection time 40 ms
Run time 600 s
Sample gas RGA gas
Figure 33. 10m Al2O3 Column for refinery gas analysis
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