8 Setting the Analytical Parameters and File Management
8.1 [SET] Key Main Screen
84
GC-2010 Plus
8.1.2 Parameter list
COLUMN OVEN
Range: 0.0−450.0 °C, Default: 25.0 °C
Sets the default temperature in the oven temperature program.
INLET PRESS
Range: 0.0−970.0 kPa (Refer to Fig. 3.5.1.), Default: 100.0 kPa
Sets the column inlet pressure.
The initial pressure must be set in order to create a pressure program.
When the control mode is set to “pressure”, the system keeps the column inlet pressure at a
constant value while the column oven temperature program is running.
COLUMN FLOW RATE
Default:
1
1.00 ml/min
Sets the carrier gas flow rate at the capillary column exit (atmospheric pressure at 25 °C).
When you set the carrier gas flow rate, the system calculates the column inlet pressure
based on the inner diameter, the length and the film thickness of the column. The column
flow rate is set separately so that the carrier gas flow rate desired occures at the initial
temperature in the column oven temperature program.
LINEAR VELOCITY
Default:
2
30.0 cm/s
Sets the average linear velocity of the carrier gas flowing in the capillary column.
When you set the linear velocity, the system calculates the column inlet pressure based on
the inner diameter, the length and the film thickness of the column. The linear velocity is set
separately so that the linear velocity desired occures at the initial temperature in the oven
temperature program.
When the control mode is set to “linear velocity”, the column inlet pressure automatically
changes so that the linear velocity remains constant even while the column oven
temperature program is running.
TOTAL FLOW RATE
Range: 0.0−1200.0 ml/min (Refer to Fig. 3.5.1.), Default: 500.0 ml/min
The total flow rate varies depending on the injection mode as follows:
In split or splitless mode, the total flow rate is equivalent to “column flow rate + split flow rate
+ septum purge flow rate”.
In direct mode, the total flow rate is equivalent to “column flow rate + septum purge flow rate”.
SPLIT RATIO
Range: -1.0/0.0−9999.9, Default: -1.0
The split ratio is “split flow rate / column flow rate.”
When you set a split ratio, the system sets the total flow rate based on the calculated carrier
gas flow rate and split flow rate, so that the desired split ratio occurs at the column oven
temperature.
Set the split ratio to “-1.0” to fix the total flow rate regardless of the column oven temperature.
PURGE FLOW RATE
Default:
3
3.0 ml/min
Set the septum purge flow rate.
SAMPLING TIME
Range: 0.00−9999.99 min, Default: 1.00 min
Sets the sampling time for splitless analysis.
The sampling time indicates the period of time after analysis starts until the split flow line is
opened.
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