Agilent 7820A GC Operating Guide

Agilent 7820A GC Operating Guide
Agilent 7820A Gas Chromatograph
Operating Guide
Software Keypad Operation
To Install the Software Keypad 30
The Software Keypad 31
The Run Keys 34
The Service Mode Key 34
The GC Component Keys 35
The Status Key 36
The Info Key 37
The General Data Entry Keys 38
The Supporting Keys 39
Method Storage and Automation Keys 40
Keypad Functionality When the GC Is Controlled by an Agilent Data
System 41
About GC Status in the Software Keypad 42
About Logs 44
This section describes the basic operation of the Agilent 7820A
GC software keypad. For additional information on keypad
functionality, see the GC Advanced User Guide.
Agilent Technologies
Software Keypad Operation
To Install the Software Keypad
Agilent provides the software keypad on the Agilent GC and
GC/MCD Hardware User Information & Utilities DVD. The
software keypad is installed as part of the GC documentation.
Insert the DVD into your PC’s DVD drive, then follow the online
instructions for installing the 7820A GC documentation. After
installation, you can open the software keypad from a desktop
icon or from the Start menu.
The software keypad requires a LAN connection to the GC.
Operating Guide
Software Keypad Operation
The Software Keypad
Use the software keypad to:
• Operate the GC without an Agilent data system
• View instrument error conditions
• Prepare the GC for maintenance
• Clear fault conditions
The software keypad can control only one 7820A Series GC at a
time. It can connect to any 7820A GC on the PC’s network.
Use only one software keypad at a time to connect to a given GC.
To connect to a GC
1 Go to Connection > Connect.
2 Select IP to enter/select an IP address, or Name to select a GC
using a previously assigned name.
3 From the Target list, either enter or select the GC IP address
or name.
4 Click Connect.
Operating Guide
Software Keypad Operation
The software keyboard window title displays the name or IP
address of the connected GC. This information also appears
at the bottom of the window.
If desired, you can enable AutoConnect to always connect to the
selected GC when launching the software keypad.
To disconnect from a GC
Select Connection > Disconnect.
Other program settings
Settings > Option > Connection
The Connection tab provides options for displaying user-friendly
names for GCs and for enabling automatic connection to a GC
when the software loads.
Enable AutoConnect to connect to the default GC when starting
the software keypad. You can also set an autoconnect from
Connection > Connect.
Use Connection History to assign the default GC that appears in
the Connect list. The connection history lists each GC to which
you have connected.
To assign a name that will appear in the Connect list, select the
GC, then click Change Name. Enter the name in the Name field,
then click Save Name.
To make a GC appear as the first entry in the Connect list, select
it in the history then click Set as Default.
To permanently delete all saved names and all connection
history, click Clear History.
Settings > Option > ShortCuts
The ShortCuts tab allows you to enable, disable, and customize
keyboard shortcuts usable with the software.
To enable keyboard shortcuts, select Enable shortcut on main panel.
Once shortcuts are enabled, you can use the default shortcuts,
or select and modify them as desired. To change a shortcut,
select it then click Change. Press the keystrokes for the new
shortcut, then click Store to save it and OK to close the Option
dialog. Shortcuts must be unique. Click Default to restore the
factory shortcut values.
Operating Guide
Software Keypad Operation
Settings > Option > Log
Select the Log tab to display the log entries compiled by the
software keypad. The software logs connection events,
communication errors, and similar events.
Settings > Language
Use Settings > Language to select the language for the software
keypad user interface. After a brief pause, the UI reloads in the
new language. This setting changes only the software keypad
language, not the language of the GC.
You can also turn off language selection during program startup
by deselecting Settings > Select Language Before Startup.
To minimize or expand the software keypad
in the bottom right corner of the window to
toggle keypad display.
To troubleshoot a connection
If the software keypad cannot connect to the GC, check the
• Verify GC is turned on.
• Verify LAN cabling is connected properly.
• Verify entered IP address is correct for GC. On the GC front
panel, press
to scroll to the IP entry. This the GCs
current IP address.
• Verify basic communications to the GC by using the ping
command. See the Troubleshooting manual.
• Verify that no one else is currently controlling the GC.
• Make sure your PC is able to communicate with the GC. The
PC IP address must be set for a similar network and subnet.
For example, if the GC IP address reads, then
your PC IP address must be 192.168.0.xx, where xx is any
number from 0 to 25 or 27 to 255. If the PC is set for a
different LAN than the GC, you must change the PC IP
address. Refer to Windows help for details. This operation
may require administrative privileges on the PC.
To get help
To open the keypad software help, go to Help > Contents.
Operating Guide
Software Keypad Operation
The Run Keys
These keys are used to start, stop, and prepare the GC to run a
[Prep Run]
Activates processes required to bring the GC to
the starting condition dictated by the method
(such as turning off the inlet purge flow for a
splitless injection or restoring normal flow from
gas saver mode). See the GC Advanced User
Guide for details.
Starts a run after manually injecting a sample.
(When you are using an automatic liquid sampler
or gas sampling valve, the run is automatically
activated at the appropriate time.)
Immediately terminates the run. If the GC is in
the middle of a run, the data from that run may
be lost. Refer to the GC Advanced User Guide for
information on how to restart the GC after
pressing [Stop].
The Service Mode Key
[Service Mode] Is used to access maintenance functions and
settings, service counters, and diagnostics for
the GC. See the GC Advanced User Guide for
Operating Guide
Software Keypad Operation
The GC Component Keys
These keys are used to set the temperature, pressure, flow,
velocity, and other method operating parameters.
To display the current settings, press any one of these keys.
More than three lines of information may be available. Use the
scroll keys to view additional lines, if necessary.
To change settings, scroll to the line of interest, enter the
change, and press [Enter].
For context-sensitive help, press [Info]. For example, if you
press [Info] on a setpoint entry, the help provided would be
similar to: Enter a value between 0 and 350.
Operating Guide
Sets oven temperatures, both isothermal and
temperature programmed.
[Front Inlet]
[Back Inlet]
Controls inlet operating parameters.
[Col #]
Controls column pressure, flow, or velocity.
Can set pressure or flow ramps.
[PCM #]
Controls column pressure, flow, or velocity
for accessory pneumatic control module(s).
Can set pressure or flow ramps.
[Front Det]
[Back Det]
Controls detector operating parameters.
[Lite EPC #]
Provides pneumatics to an inlet, detector, or
other device. Use to configure the detector
EPC for use. Can be used for pressure
Edits injector control parameters such as
injection volumes and sample and solvent
[Valve #]
Allows for configuration or control of the gas
sampling valve (GSV) and/or switching
valves on or off.
[Analog Out]
Assigns a signal to the analog output. The
analog output is located on the back of the
Software Keypad Operation
The Status Key
Toggles between setpoint/actual values for most
commonly reviewed parameters and displays
“ready,” “not ready,” and “fault” information.
When the Not Ready status light is blinking, a
fault has occurred. Press [Status] to see which
parameters are not ready and what fault has
The order in which items appear in the scrolling
display window for [Status] can be modified. You
may, for example, want to display the things you
most frequently check in the top three lines so
that you do not need to scroll to see them. To
change the order of the Status display:
1 Press [Config] [Status].
2 Scroll to the setpoint you want to appear first
and press [Enter]. This setpoint will now
appear at the top of the list.
3 Scroll to the setpoint you want to appear
second and press [Enter]. This setpoint will
now be the second item on the list.
4 Continue as above until the list is in the order
you require.
Operating Guide
Software Keypad Operation
The Info Key
Operating Guide
Provides help for the currently shown
parameter. For example, if Oven Temp is the
active line in the display (has a < next to it),
[Info] will display the valid range of oven
temperatures. In other cases, [Info] will display
definitions or actions that need to be performed.
Software Keypad Operation
The General Data Entry Keys
[Mode/Type] Accesses a list of possible parameters associated
with a component’s nonnumeric settings. For
example, if the GC is configured with a
split/splitless inlet and the [Mode/Type] key is
pressed, the options listed will be split, splitless,
pulsed split, or pulsed splitless.
Removes a misentered setpoint before pressing
[Enter]. It can also be used to return to the top line
of a multiline display, return to a previous display,
cancel a function during a sequence or method, or
cancel loading or storing sequences and methods.
Accepts changes you enter or selects an alternate
Scrolls up and down through the display one line
at a time. The < in the display indicates the active
Numeric Keys Are used to enter settings for the method
parameters. (Press [Enter] when you are finished to
accept the changes.)
Are used when you are setting up parameters,
such as the warning beep, method modification
beep, and key click or for turning on or off a device
like a detector.
[Front] [Back] Are mostly used during configuration operations.
For example, when configuring a column, use
these keys to identify the inlet and detector to
which the column is attached.
Removes methods, sequences, run table entries,
and clock table entries. [Delete] also aborts the
adjust offset process for nitrogen-phosphorus
detectors (NPD) without interrupting other
detector parameters. See the GC Advanced User
Guide for more details.
Operating Guide
Software Keypad Operation
The Supporting Keys
Operating Guide
Displays the current date and time on the first line.
The two middle lines show the time between runs,
the elapsed time and time remaining during a run,
and the last run time and post-time during a
The last line always displays a stopwatch. While on
the stopwatch line, press [Clear] to set the clock to
zero and [Enter] to start or stop the stopwatch.
[Post Run]
Is used to program the GC to do something after a
run, such as bakeout or backflush a column. See the
GC Advanced User Guide for details.
Toggles between two logs: the Run Log and the
System Event Log. The information in these logs
can be used to support Good Laboratory Practices
(GLP) standards.
Accesses the instrument parameters setup option,
such as keypad and display. Scroll to the desired
line and press [Enter] to access the associated
entries. See the GC Advanced User Guide for
Is used to set up components that are not
automatically detectable by the GC but are essential
to running a method, such as column dimensions,
carrier and detector gas types, makeup gas
configurations, and column plumbing to inlets and
detectors. These settings are part of, and are stored
with, the method.
To view the current configuration for a component
(such as the inlet or detector), press [Config], then
the component key of interest. For example,
[Config][Front Det] opens front detector
configuration parameters.
Software Keypad Operation
Method Storage and Automation Keys
These keys are for loading and storing methods and sequences
locally on your GC. They cannot be used to access methods and
sequences stored by your Agilent ChemStation.
Are used to load and store methods and sequences
on your GC.
To load a method, press [Load] [Method] and select
one from the list of methods stored in the GC. See
the GC Advanced User Guide for more details on
these operations.
[Run Table] Is used to program special events you require
during a run. A special event could be switching a
valve, for example. See the GC Advanced User
Guide for details.
[Clock Table] Is used to program events to occur at a time of day,
as opposed to during a specific run. This could, for
example, be used to start a shutdown run at
5:00 p.m. every day. See the GC Advanced User
Guide for details on this function.
[Seq Control] Starts, stops, pauses, or resumes a sequence, or
views the status of a sequence. See the GC
Advanced User Guide for details.
Operating Guide
Software Keypad Operation
Keypad Functionality When the GC Is Controlled by an Agilent Data System
When an Agilent data system controls the GC, the data system
defines the setpoints and runs the samples. The Remote
indicator on the software keypad lights when a data system is
controlling the GC.
Using the software keypad to change setpoints when a data system
controls the GC can cause erroneous data. When using the software
keypad, the GC does not automatically communicate setpoint
changes to the connected data system.
When an Agilent data system controls the GC, the software
keypad should be used:
• To view run status by selecting [Status]
• To view the method settings by selecting the GC component
• To display the last and next run times, the run time
remaining, and the post-run time remaining by repeatedly
selecting [Time]
• To abort a run by selecting [Stop]
• To find which computer is controlling the GC by pressing
[Options] > Communication, then scrolling. The name of the
computer controlling the GC is listed under the Enable DHCP
setting, along with the number of hosts connected to the GC.
Operating Guide
Software Keypad Operation
About GC Status in the Software Keypad
When the GC is ready to begin a run, the display screen shows
STATUS Ready for Injection. Alternatively, when a component of
the GC is not ready to begin a run, the Not Ready indicator on the
software keypad is lit. Press [Status] to see a message explaining
why the GC is not ready.
A lit indicator means:
• The current progress of a run (Pre Run or Run).
• Items which may require attention (Not Ready, Service Due,
and Run Log.
• The GC is controlled by an Agilent data system (Remote).
• The GC is in gas saver mode (Gas Saver).
Error conditions
If a problem occurs, a status message appears. If the message
indicates broken hardware, more information may be available.
Press the applicable component key (for example, Front Det,
Oven, or Front Inlet).
Blinking setpoint
If the system shuts down a gas flow or the oven, Off will blink on
the appropriate line of the component’s parameter listing.
Operating Guide
Software Keypad Operation
If there is a detector pneumatics shutdown or failure in another
part of the detector, the detector On/Off line of the detector’s
parameter list blinks.
Operating Guide
Software Keypad Operation
About Logs
Two logs are accessible from the keypad: the run log and the
system event log. To access the logs, press [Logs] to toggle to the
desired log. The display will indicate the number of entries the
log contains. Scroll through the list.
Run log
The run log is cleared at the start of each new run. During the
run, any deviations from the planned method (including keypad
intervention) are listed in the run log table. When the run log
contains entries, the Run Log indicator lights.
System event log
The system event log records significant events during the GC’s
operation. Some of the events also appear in the run log if they
are in effect during a run.
Operating Guide
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