CP-3800 GC Operator’s Manual
39
After activating your method, you may disable Constant Flow Programming.
The calculated pressure program will be retained and may be edited. If you
edit the calculated pressure program, you should make sure that Constant
Flow Programming is disabled on Page 2. Failure to do so will result in your
edits to the pressure program being overwritten when the method is
reactivated.
Gas Saver
For type 1 EFC a specific Gas Saver Flow and a timeout period may be
set.
A time entry of 0 turns the Gas Saver feature off
. If a non-zero time
is entered, the Gas Saver timer will start incrementing upon a method
activation. If a run is not started or another method not activated before the
timer expires, the set Gas Saver flow rate will be started. A message will be
logged in the instrument log.
The fault is cleared by activating a method.
EFC setup for type 1 modules (CP-1177 and 1079 injectors) also contains
a septum purge calibration and S/L Vent Flow. Septum purge calibration
involves measuring a flow rate at a set pressure and entering those values
into the system to correctly calculate the settings for split and column flow.
The S/L Vent Flow provides a vent purge for runs in which the split valve
remains closed for the duration of the run.
All EFC modules can be calibrated, if necessary, using the Autocalibrate
softkey. This procedure should be carried out every six months, or when
a
new EFC module is installed. Failure to AutoCalibrate may cause a
mismatch between set and actual flowrates resulting in a Not Ready
condition in the CP-3800.
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