Agilent Technologies 990 User Manual

2 Instrument Overview
Micro GC Cycle with Ramped Pressure
Agilent 990 Micro GC User Manual 31
Micro GC Cycle with Ramped Pressure
The timing diagram below provides an overview of the ramped (programmed) pressure cycle of
the Micro GC. The timing before the injection is identical to the constant pressure cycle.
Pressure
Time
Initial
pressure
Run started
Equilibration
time
Sample
time
Pressurization
time
Download
method
Inject time
Run time
Inject Start data
acquisition
Run
finished
Final
pressure
Not ready
Pressure
release
Pressure
rise
Ready
Ready
Initial
time
Rise time Final time
Relieve
time
Stabilization
time
The remaining final time depends on the total run time, the
duration of the initial time and the pressure rise. This means that
it is possible that the final time is zero. Another situation is that
the final pressure is limited because of these settings. The
software will check all parameter values and change them into
realistic values.
Note: During the run time, there can be only one pressure ramp to
a higher pressure.
The pressure rise is started,
the duration is depending
on two parameters:
• Pressure rise
• Final pressure
Stabilization
time for the
pressure after it
has been
returned to the
initial pressure.
Fixed at 500 mS.
Relieve time, the
time needed to
decrease the
column head
pressure from the
final pressure to
the initial
pressure.
As soon as the final
pressure is reached,
the rise stops and
the final time
begins. The
pressure remains
the same.
During initial time,
the column head
pressure remains
the same.
1
1
2
3
4 5
2 3 4 5

Agilent Technologies 990 Specifications

General

Brand	Agilent Technologies
Model	990
Category	Laboratory Equipment
Language	English