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The first row of the spreadsheet contains the Initial pressure and hold time for the
Type 1 EFC. The EFC will equilibrate to this setting when the method is
activated, and will be restored to this setting when each chromatographic run is
completed.
Rows after the first row of the spreadsheet contain the programmed settings for
each of the ramp segments. Each segment will ramp to the specified pressure at
the specified rate (assuming the rate is achievable), and then hold the pressure
for the specified time. (Note that the Rate in the first row is always blank and
cannot be edited. Also note that the entire Total column cannot be edited.)
Constant Column Flow for Type 1 EFC
Constant Column Flow mode for Type 1 EFC is enabled in the Flow/Pressure
window.
Click on the Radio Button to turn on the Constant Column Flow Mode. This mode
disables the spreadsheet and reveals the constant flow rate value.
Enter the desired Column Flow.
When the method is activated in System Control, the Varian MS Workstation will
generate and download the appropriate pressure program corresponding to the
Column Temperature program, the Column Setup Length and Diameter, the
Carrier Gas, and the ambient Barometric Pressure. These parameters are
specified at the 3800 GC front panel, and the Barometric Pressure is measured
by the 3800 at the time the Method is downloaded. The 3800 will run the
pressure program to hold the Column Flow at the specified value as the Column
Temperature is ramped during each run.
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