Agilent Technologies MSD 5977B Series

4 Installing 7890 GC Columns
To Calibrate Column Flow Linear Velocity in a 7890 GC
5977B Series MSD Operating Manual 97
Calculation for average linear velocity
Average linear velocity (cm/s) =
where:
L = Length of the column in meters
t = Retention time in seconds
Calculation for volumetric flow rate
Volumetric flow rate (mL/min) =
where:
D = Internal column diameter in millimeters
L = Column length in meters
t = Retention time in minutes
100 L
t
---------------
0.785 D
2
L
t
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