I
NSTALLATION
Quick Guide to the 3800 Keyboard and Display
CP-3800 GC Getting Started Manual
19
EFC (Electronic Flow Control) identifies any installed EFC modules and
their type. Types 1, 3, and 4 are used with inlet systems and Types 11
through 16 with detectors. Detector EFC Setup involves selecting the
relevant gas type and, in some cases, the detector type. Inlet types allow
you to set the pressure display units (psi, bar or Kpa), outlet pressure and
minimum flow (type 1 EFC only). Outlet pressure is used to distinguish
between a column venting to atmosphere or a column venting to a
vacuum source such as a mass spectrometer. The Atm setting is used
for the standard 3800 detectors such as FID, TCD, ECD, TSD, and
PFPD. Minimum flow is the split vent flow rate that type 1 EFC maintains
during the gas saver period of operation. EFC setup for type 1 modules
(1079) also contains a septum purge calibration.
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
mis-match between set and actual flowrates resulting in a Not Ready
condition in the 3800.
Column Parameters define values used for EFC calculations such as
column length, internal diameter, and choice of carrier gas. Note that if
Argon or Argon/Methane carrier gas is used, the Nitrogen option should be
selected. The EFC calculations for Nitrogen, Argon, and Argon/Methane are
essentially the same.
Valves defines the assignment of the seven available external events on
the 3800. These are typically used with either manually controlled 1079
split valves (non-EFC) or actuators for sampling or switching valves. The
setup screen identifies the valve type and default state, i.e., the state it is
in when the valve is not energized. The following table summarizes the
available valve types and their states. Note that the valves are normally
identified on the 3800 display by their abbreviation, but when the display
cursor is placed on a specific valve its full name is given on the prompt
line of the display.
