8 Setting the Analytical Parameters and File Management
8.1 [SET] Key Main Screen
92
GC-2014
8.1.2 Parameter list
• COLUMN OVEN
Range: 0.0−400.0 °C, Default: 25.0 °C
Sets the default temperature in the oven temperature program.
•Flow
When the packed INJ (DAFC) is used
L. inlet pressure, R. inlet pressure
Column inlet pressures are indicated. (L: left side, R: right side)
L. column flow rate, R. column flow rate
Range: 0.0−100.0 ml/min, Default: 50 ml/min
Enter the column flow rate. Set the initial flow rate to set a flow rate program. When the
control mode is set to “Single L” or “Single R,” only the specified side is displayed.
When the SPL, etc. (AFC) is used
INLET PRESS
Range: 0.0−970.0 kPa (Refer to Fig. 12.2.5.), 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 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 and the length 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
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 and the length 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 oven temperature
program is running.
TOTAL FLOW RATE
Range: 0.0−1200.0 ml/min (Refer to Fig. 12.2.5.), 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 oven
temperature.
Set the split ratio to “-1.0” to fix the total flow rate regardless of the oven temperature.
To Next Page
Loading...
Need help?
General
