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GL Sciences OPTIC-4 - Column Flow Parameters

GL Sciences OPTIC-4
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OPTIC-4 User’s Guide
Issue 5.3
Defining and Running Methods
Page 7-6
This parameter determines the inlet temperature at the end of the temperature ramp.
Hold Time
Hold Time is time, during which the inlet temperature is maintained constant. If the Temperature
Control is set to ‘Floating’ then the inlet temperature stops being controlled at the end of the
thermal segment.
Temperature Control
This parameter determines if the inlet temperature is maintained to the end, or it is allowed to float
at the end of the Hold Time.
Solvent Cooling Effect
This parameter determines whether or not a solvent cooling effect (rapid cooling during the solvent
evaporation) should be used during solvent elimination (Expert Method only). For more information
about this feature you are referred to Section 9.2 “Solvent cooling effect”.
Cooling Valve Mode
This parameter determines if inlet cooling is switched on or off during the method run time (Expert
Method only). When it is set to “No”, cooling is switched off and the inlet temperature is maintained
by the inlet heater controller.
7.4.3 Column Flow Parameters
Carrier Control Mode
This parameter determines the carrier gas control mode. When it is set to “Pressure”, the carrier gas
flow through the column is controlled using the inlet pressure as a parameter. In case of “Flow”, the
column volumetric flow is used as the main parameter to determine the carrier gas flow.
Transfer Time
This parameter determines the time during which the transfer flow is maintained after the start of
the method run.
Transfer Column Flow/Inlet Pressure
This parameter enables the user to set the column flow (inlet pressure) used to transfer the sample
from the inlet onto the column (a higher flow (inlet pressure) gives a faster transfer).
Start Column Flow/Inlet Pressure
This parameter determines the carrier gas flow (inlet pressure) after the transfer time has elapsed,
i.e. the column flow (inlet pressure) at the start of the actual analysis segment.

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