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Part 1. Electronic Pneumatic Control (EPC) Flow and Pressure Control
Enter a flow or pressure program (optional)
Enter a flow or pressure program (optional)
If you selected either the ramped pressure or ramped flow column mode, the
column control table contains entries for setting up a ramp program.
You begin with an initial value, either Init Pres or Init Flow, and an
Init time. At the end of that time, Rate 1 begins and runs until it reaches
Final pres (or Final flow). It 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.
Procedure: Programming column pressure or flow
1. Press [Col 1] or [Col 2].
Pressure (in this example) is the
controlled setpoint; the others
are reported values.
Because
Mode is Ramped
the ramp is given in
units.
pres,
pressure
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