158 Advanced Operation Manual
4 Columns and Oven
remains at that value for Final time 1. You can then add a
second and third ramp, each consisting of a Rate, a Final
value (pressure or flow), and a Final time.
The program ends when it reaches a Rate that is set to 0
(Off).
When a flow or pressure program is running, the Pressure,
Flow, and Velocity lines that you used to set constant
conditions show the progress of the program.
The oven program determines the length of the run. If a
flow or pressure program ends before the analytical run
does, the flow (or pressure) remains at the last final value.
Programming column pressure or flow
1 Press [Col 1] or [Col 2], or press [Aux col #] and enter the
column number.
2 Scroll to Initial pressure (or Initial flow). Type the desired
value and press [Enter].
3 Similarly, enter a value for Initial time. This completes the
initial part of the program.
4 To begin a ramp, enter a positive value for Rate 1. It does
not matter whether you are programming up or
down—the rate is always positive.
5 If Rate 1 is zero, the program ends here. If you enter any
other value, the Final value lines for the first ramp
appear and the cursor moves to the line.
6 Enter values for Final pressure 1 (or Final flow 1) and Final
time 1. This completes the first ramp.
7 To enter a second ramp, scroll to the appropriate Rate
line and repeat steps 5 and 6. A maximum of 20 ramps
can be entered.
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