CP-3800 GC Operator’s Manual
41
Type 4 EFC
Type 4 EFC is used with valved systems where the inlet head pressure will
typically be kept constant, but the total flow can be changed to maintain this
head pressure in the event of a sudden drop in system pressure (as is usual
when a sample at atmospheric pressure is loaded into the system).
Pressure programming the inlet head pressure, similar to type 1 EFC, is also
possible to maintain a constant column flow rate during a column oven
temperature program. The programming of type 4 EFC is done on 2 pages
(see below). Page 1 includes a ramp table for programming the inlet
pressure. Page 2 is a timed events table for setting the total flow rate. In this
example the column head pressure is held constant during the analytical run,
but the total flow into the system is increased significantly at the beginning of
the run to allow the system to respond more rapidly to pressure transients by
sampling valve actuation.
ACTIVE
METHOD
EDIT
METHOD
CTRL
RUN
TIME
END
TIME
Method 1
Method 1
0.00
20.00
Col Press (psi): 10.0 Col Flow (mL/min): 15
Linear Vel. (cm/sec): 125 Total Flow (mL/min): 30
REAR EFC TYPE 4, Page 1 of 2
Step
Pres (psi)
Rate (psi/min)
Hold (min)
Total (min)
Initial 10.0
-
20.00
20.00
ACTIVE
METHOD
EDIT
METHOD
CTRL
RUN
TIME
END
TIME
Method 1
Method 1
0.00
20.00
Col Press (psi): 10.0 Column Flow (mL/min): 15
Linear Vel. (cm/sec): 125 cm/sec Total Flow (mL/min): 30
REAR EFC Type 4, Page 2 of 2
Time
Total Flow (mL/min)
Initial
30
0.00
100
0.50
30
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