7 Starting and Stopping the GC [SYSTEM]
7.4 Specifying the Stop Procedures
81
GC-2010 Plus
FLOW CONTROL
Selection: End/Cont, Default: Cont
Select “End” to end gas control after the flow off time elapses.
Select “Cont” to continue the carrier gas flow.
The “GAS CONTROL” setting on the [SYSTEM] key main screen is set here.
SLEEP TIME
Range: 0.1−6000.0 min, Default: --- (because the RESTART GC could be set to “Off”.)
Sets the period of time after temperature/detector control ends until the GC restarts.
This item cannot be set if the GC is not set to restart automatically.
The “SLEEP TIME” setting on the [SYSTEM] key main screen is set here.
RESTART GC
Selection: On/Off, Default: Off
Select “On” to restart the GC once the sleep time has elapsed.
Select “Off” to not restart the GC automatically.
The “Restart GC” setting on the [SYSTEM] key main screen is set here.
7.4.3 System shut down examples
The following examples show various situations where STOP TIME and FLOW OFF TIME
can be used effectively. The FLOW OFF TIME should be longer than the time for the column
oven cooling.
• After the end of an analysis, each heated zone is cooled. Once the column over is
cool, carrier gas flow is shut off.
STOP TIME = 0 minutes
FLOW CONTROL = End
FLOW OFF TIME = Approx. 20 minutes
• A column is conditioned, then the column oven is cooled. Carrier gas flow is then
shut down.
STOP TIME = Column conditioning time
FLOW CONTROL = End
FLOW OFF TIME = Approx. 20 minutes
• At the end of an analysis, each heated zone is cooled, but carrier gas is kept flowing
for rapid equilibration for the next day’s analysis. The next day, the system is automati-
cally restarted (15 hours = 900 minutes later), and temperature control resumes.
START TIME = 0 minutes (because the carrier gas continued to flow)
STOP TIME = 0 minutes
FLOW CONTROL = Cont (to keep carrier gas flow on)
RESTART GC = On
SLEEP TIME = 900 minutes (at the end of the SLEEP TIME, the GC
restarts)
• At the end of an analysis, each heated zone is cooled, and the carrier gas flow is
stopped once the column oven is cool. The following day (15 hours = 900 minutes
later), carrierr gas flow is turned back on and temperature control begins.
START TIME = 10 minutes (because carrier gas flow was off)
STOP TIME = 0 minute
FLOW CONTROL = End
FLOW OFF TIME = Approx. 20 minutes
RESTART GC = On
SLEEP TIME = 900 minutes (at the end of the SLEEP TIME, the GC
restarts)
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