3 AFC, APC
3.2
3.
34
GC-2010 Plus
3.2Definition of Terms
Q Column inlet pressure
Column inlet pressure refers to the injection port pressure.
When set to “0 kPa”, the injection port pressure is equal to atmospheric pressure.
Q Total flow rate
Total flow rate is the flow rate controlled by the TFC (Total Flow Controller) located upstream
of the injection port.
(Refer to Fig. 3.3.1)
Q Column flow rate
The column flow rate in the GC-2010 Plus gas chromatograph indicates the volume flow rate
inside the column converted at the atmospheric pressure and the room temperature, which
corresponds to the flow rate measured at room temperature by a flow meter connected to
the column outlet.
The column flow rate can be calculated with the following equation:
∗ The viscosity coefficient depends the column oven temperature.
Q Linear velocity
Linear velocity indicates how many cm the carrier gas moves inside the column.
The terms “VELOCITY”, “linear velocity” in this instruction manual indicate the average
linear velocity inside the column.
The average linear velocity can be obtained with the following equation:
Q Split ratio
split frow
For the GC-2010 Plus, split ratio refers to ―――――――.
column flow
60πd
4
(P + P 0)
2
- P 0
2
Fc ＝ ――――― ×―――――――× 10
3
256 µLP0
where
Fc : Column flow rate (ml/min)
d : Column inner diameter (mm)
L : Column length (m)
P : Column inlet pressure (kPa)
P
0 : Column outlet pressure
(= atmospheric pressure) (kPa)
µ : Viscosity coefficient
*
(19.4 µPa•sec, helium at 20 °C)
K (P + 2P
0)
2
× P - 0.234
V ＝―― × ――――――――――――――
µ ｛(P + P
0) × (P + 2P 0) + P 0
2
｝
where
D
4
× 10
4
K ＝ ―――――
L
V : Average linear velocity
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