Agilent Technologies 990 User Manual

2 Instrument Overview
Micro GC Cycle with Constant Pressure
30 Agilent 990 Micro GC User Manual
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.
Pressure
Time
Initial
pressure
Run started
Equilibration
time
Sample
time
Pressurization
time
Download
method
Inject time Run time
Inject Start data
acquisition
Run finished
After the run
sampling has
started. This
means that the
sample is mostly
drawn into the
sample loop.
1
Before a run is
started, all
used method
parameters
must be
downloaded
through the
data system.
4
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.
5
Fixed
equilibration
delay of 40 ms.
This time
allows the
sample to
settle in the
sample loop.
6
The real
analysis (run)
and data
acquisition
starts.
7
After the
specified run
time has
elapsed, the run
is finished.
8
Fixed
pressurization
delay (400 ms),
used to pressurize
the sample to the
same pressure as
the column head.
2
During injection
time, the
sample is
transported to
the column by
the carrier gas.
3
1 2 3
4
6
7 8
5

Agilent Technologies 990 Specifications

General

Brand	Agilent Technologies
Model	990
Category	Laboratory Equipment
Language	English