Options 11
Operation Manual 191
• Unretained peak
• Calculated length or Calculated diameter
• Not calibrated
9 Scroll to Measured flow and enter the corrected column
flow rate (in mL/min) from the run performed above.
10 When you press [Enter], the GC will estimate the column
length or diameter based on the elution time input and
will now use that data for all calculations.
To estimate the actual column length and diameter
1 Set oven ramp 1 to 0.00, then verify that the column is
defined.
2 Perform a run using an unretained compound and record
the elution time.
3 Set the oven, inlet, and detectors temperatures to 35 °C
and allow them to cool to room temperature.
4 Remove the column from the detector.
5 Measure the actual flow rate through the column using a
calibrated flow meter. Record the value. Reinstall the
column.
6 Press [Options], scroll to Calibration and press [Enter].
7 From the calibration list, select the column and press
[Enter]. The GC displays the current calibration mode for
the column.
8 To recalibrate or to change calibration mode, press
[Mode/Type] to see the column calibration mode menu.
9 Scroll to Length & diameter and press [Enter]. The following
choices appear:
• Mode
• Measured flow
• Unretained peak
• Calculated length
• Calculated diameter
• Not calibrated
When you measure the column flow rate, be sure to convert the
measurement to normal temperature and pressure if your
measurement device does not report data at NTP. If you enter
uncorrected data, the calibration will be wrong.
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