PerkinElmer CLARUS 590 GC, User Manual

Page: 84 / 284

84 . Clarus 590 GC User’s Guide
10. Use the up and down arrow or keypad buttons to enter an Internal Diameter which is
measured in micrometers (not millimeters).
11. Then view the calculated linear gas velocity from selecting
Utilities
from the
Tools
menu and
selecting the
Column Flow Calc.
The Column Carrier Gas Calculator screen appears:
NOTE: If you incorrectly enter a column length or internal diameter, the resulting flow and pressure
may be incorrect. For example, a 0.25 mm column may actually be 0.22 mm To verify that you
have entered the correct values, you can measure the linear gas velocity by injecting methane
and calculating the linear gas velocity
column length (cm)
Retention Time of Methane (sec)
12. Return back to the Configure Injector screen and select either a Flow or Ratio Split Mode .
•
If you select Flow , you will enter a split flow in your method. The software controls and
calculates the split ratio.
• If you select
Ratio
, you enter the split ratio in your method. The software controls the ratio
and calculates the split flow.