Reference
Varian, Inc.
User Manual Micro-GC
Page 66
Pressure
time
Sample Time
pressurisation
time
inject time
equilibration time
run time
initial pressure
final pressure
download
method
run started
start data acquisition
run finished
inject
initial time
final time
rise time
pressure rise
pressure relieve
relieve
time
stabilisation
time
ready
not ready
ready
As soon as the final-pressure is
reached, the rise stops and the
final-time begins. The pressure
remains the same.
Relieve time, the time needed to
decrease the column head pressure
from the final pressure to the initial
pressure.
Cycle with electronic pressure control
This timing diagram will help you to understand the electronic pressure control (EGC) cycle of the Micro-GC .
The diagram shows the situation in the Micro-GC , using electronic (programmed) pressure control. The timing before the
injection is identical to the static pressure cycle.
During initial time
the column head
pressure remains the
same.
The pressure rise is started,
the duration is depending on
two (2) parameters:
Pressure
rise
Final pressure
Stabilization
time for the
pressure after it
has been
returned to the
initial pressure
Fixed 500 mS
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 higher pressure.
Summary of Contents for Micro-GC 490-GC
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