3900 GC Keypad

3900 GC Keypad
Green keys cause changes to take place
immediately, for instance pressing NEW LINE
will cause a new line to be added to a method
time program table.
Yellow keys take you to entries that
can be changed such as method
sections, setup and commands.
Blue keys are display actions only. They display
status or help navigate the display, they can also
be used to cancel an edit before it is accepted by
pressing ENTER.
LEDs show you the GC run state and which
section is shown on the display at a glance.
Use + and – to change entry
values in editable fields.
Use UP LINE to scroll up
through the various display
pages and to cancel an edit
before pressing ENTER.
Pressing START will begin
automation if present, start
a run if no automation is
present, or allow you to
AutoInject a sample. The
STOP key ends a run in
progress.
READY
RUN
STAB/EQUIL
NOT READY
FAULT
E
N
T
E
R
UP LINE
Use ENTER to scroll down
through display pages and to
accept changes made to
editable fields (denoted by
flashing right cursor).
A/S
EE
START
STOP
INJ
NEW
LINE
Use the AUTO key to
program local automation.
AUTO
COL
DELETE
LINE
Pressing STATUS allows you
to view the actual conditions
being used by the 3900 GC.
Use NEW LINE and DELETE
LINE to add and remove
program lines to Method time
program tables.
DET
STATUS
SETUP
Press SETUP to change instrument basic
configuration settings such as:
• Column dimensions
• Carrier Gas
• Perform IEFC and DEFC Autocalibration
• Perform Septum Purge calibration
• Calibrate A/S vial and injector positions
COMMAND
Press COMMAND to perform actions that are not part of a
method time program. Examples of these imperative
actions are:
• Turn column oven on or off.
• Activate, copy, or preset a method.
• Detector ignite, autozero now, or clear autozero.
• AutoSampler change syringe, reset plunger counter,
tower home, beeper on/off.
• Remote or local mode operation (with Ethernet
communications Option).
Hint: Commands are grouped according to the operation
being performed, press COMMAND multiple times to jump
between sections. Use either ENTER or UP LINE to step
through the various entries one at a time.
Pressing A/S EE displays the
AutoSampler and External
Events methods for editing.
AutoSampler must be present
to edit A/S method sections.
Pressing INJ allows you to
turn the injector oven on and
off and displays the injector
(temperature and split ratio),
and carrier gas (pressure or
constant flow modes)
methods for editing.
Pressing COL allows you to
edit and build column oven
temperature programs and
set the stabilization time.
Pressing DET allows you to
turn the detector oven and
detector electronics on and
off, and displays the detector
time program allowing you to
set temperature, detector
range, attenuation, and time
programmed AutoZero
events.
03-914885-00:Rev. 3
Preset Method
The 3900 GC uses a Preset Method compatible
with light hydrocarbon samples (C-14, C-15, and
C-16 such as found in the FID and TCD Test Mix).
The preset conditions on power-up are:
Injector =140 ºC
Split ratio set to 50
Flow rate set to 2 mL/min
Column oven set to 80 ºC for 0.5 minutes
ramping to 160 ºC at 20 ºC/min and holding
for 2 minutes
Detector set to 200 ºC
Inject the Test Mix
1. Make certain an appropriate column is installed.
2. Make certain the correct gasses are connected and
turned on.
3. Ensure the GC is powered up and the Star
Workstation or a data acquisition system is
connected.
4. Perform an Inject Single Sample action if you are
using the Star Workstation, or wait for the data
system to be ready to acquire data.
5. Finally, make your injection.
Modify the Preset Method if the conditions are not appropriate for your sample.
To return to preset conditions, press the COMMAND key on the keypad and select
Preset Method.
3900 GC Features
Full access to the injector
Hinged detector cover
Septum purge
cover snaps off
Access to detector
Injector cover rolls back
Septum purge
adjustment
Septum purge
cover off
03-914885-00:Rev. 3

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