Flow and Pressure Control Part 1. Electronic Pneumatic Control (EPC)
Enter the initial flow or pressure or average linear velocity
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Enter the initial flow or pressure or average linear
velocity
If the column is defined, you can enter any one of these quantities—the GC will
calculate and display the other two.
For example, you may have selected Constant pressure as the column
mode. You decide to specify, as a starting condition, the column flow. The GC
will compute the pressure necessary to achieve this flow (as well as the average
linear velocity) and hold this pressure constant during the run.
If you select Constant flow as the mode and specify column flow as the
initial condition, the GC will still calculate the pressure necessary to achieve
this flow, but it will adjust the pressure as necessary to maintain constant flow.
If the column is not defined, you can enter only pressure. Constant flow can still
be specified, but the GC cannot know what the flow is.
See the following table for recommended flows for various column diameters.
These are close to optimum for a wide variety of components.
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