Instant Action Keys [Start], [Stop], And [Prep Run] - Agilent Technologies 6890 Series Operating Manual

The Keyboard and Display

Instant action keys [Start], [Stop], and [Prep Run]

Instant action keys [Start], [Stop], and [Prep Run]
These keys cause the instrument to do something now.
[Start] and [Stop]
Start and stop any type of run. [Stop] cancels a Pre Run, Post Run, or power fail
recovery and aborts an INET or local sequence.
[Prep Run]
If you are using one or more of the following functions, you must press [Prep
Run] to prepare for a run:
• Gas saver—cancels gas saver flow and brings inlet flow to its setpoint value.
• Splitless injection—closes the purge valve.
• Pulsed split or splitless injection—increases inlet pressure to the pulse
setpoint.
• Solvent vent injection—changes inlet pressure to the vent pressure setpoint
and split vent flow to the vent flow setpoint.
Pressing [Prep Run] turns on the Pre Run LED. When the LED is blinking, the
instrument is preparing for a run and waiting for instrument setpoints (other than the
ones associated with Prep Run) to be reached. Once these setpoints are ready, the LED
remains on and the Prep Run events occur. After a 6-second equilibration time, the
instrument is ready for a run and the Not Ready light goes out.
If you press [Prep Run] while the Pre Run LED is blinking, the LED stops blinking
before all setpoints are ready. At this point, the gas saver and purge valve portions of
your split/splitless inlet are ready for a run.
With most automatic injection systems, you do not need to use the [Prep Run]
key. If your sampler or automation controller (for example, an integrator or
workstation) does not support the Prep Run function, you must set the
instrument to Auto Prep Run. See the example on page 35.
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