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2
Instrument Overview
Micro GC Cycle with Constant Pressure
Micro GC Cycle with Constant Pressure
The timing diagram below provides an overview of the constant pressure cycle of the Micro GC.
This description is only for one channel. In most cases, a dual-channel system is used. When a
dual-channel system is used, the sequence is the same, but the timing settings can differ. If the
sample time on channel A and channel B are different, the longest time is used for both channels.
Also the run time can be specified per channel; the data acquisition stops per channel as soon as
the run time has elapsed. The total analysis time depends on the longest run time.
1
Initial
pressure
Download
Sample
method
time
4
5
Run started
4
Before a run is
started, all
used method
parameters
must be
downloaded
through the
data system.
30
After the run
sampling has
started. This
means that the
sample is mostly
drawn into the
sample loop.
1
2
Pressurization
time
Equilibration
time
6
Inject
5
6
The run can be
started when
the Micro GC is
ready (Green
LED is lit). The
data system will
wait until data is
received from
the Micro GC.
2
Fixed
pressurization
delay (400 ms),
used to pressurize
the sample to the
same pressure as
the column head.
3
Inject time
Run time
7
Start data
acquisition
7
Fixed
The real
equilibration
analysis (run)
delay of 40 ms.
and data
This time
acquisition
allows the
starts.
sample to
settle in the
sample loop.
3
During injection
time, the
sample is
transported to
the column by
the carrier gas.
Time
8
Run finished
8
After the
specified run
time has
elapsed, the run
is finished.
Agilent 990 Micro GC User Manual
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