Shimadzu GC-2010 Plus - Page 167

12 Injection Port
12.7 Setting the Flow Rate Parameters
147
GC-2010 Plus
Example 1: Column oven temperature = 50 °C(carrier gas = helium)
Example 2: Column oven temperature = 200 °C (carrier gas = helium)
NOTE Fig. 12.7.2 shows the relationship between the column flow rate and the column inlet pressure.
60πd
4
（P ＋ P0）
2
－ P0
2
Fc ＝ × ×10
3
256 µL P0
Fc : Column flow rate [ml/min]
d : Column I.D [mm]
L : Column length [m]
P : Column inlet pressure [kPa]
P
0 : Column outlet pressure = atmospheric pressure [kPa]
µ : Viscosity coefficient (19.4 µPa•s (helium, 20 °C))
Fig. 12.7.2
Length
30 m 60 m
I.D. of column Film thickness
0.25 mm 0.25 µm 100 kPa 210 kPa
0.32 mm 0.25 µm 60 kPa 120 kPa
0.53 mm 1.5 µm 20 kPa 40 kPa
Length
30 m 60 m
I.D. of column Film thickness
0.25 mm 0.25 µm 130 kPa 275 kPa
0.32 mm 0.25 µm 80 kPa 160 kPa
0.53 mm 1.5 µm 30 kPa 60 kPa