Installing 7890 GC Columns 2
5977B Series MSD Operating Manual 53
9 Click Calc Length in the If unretained peak holdup time is known section to
display the Calculate Column Length dialog. (See Figure 9.)
10 Verify that the parameters listed (temperature, inlet and outlet pressures,
and gas type) are those used in the method to determine the holdup time.
Change any parameters that are different than those used in your method.
11 Enter the recorded retention time in the Holdup Time field. Move the cursor
to another parameter’s field and the calibrated column length appears.
12 Click OK to save the changes and exit the dialog.
13 Click OK on the Calibrate Columns dialog to save the calibration.
With capillary columns, such as those used with the MSD, linear velocity is
often measured rather than volumetric flow rate.
Figure 9 Calibrate column length dialog
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