User guide

64 Advanced User Guide
3 Options
5
Measure the actual flow rate through the column using a
bubble 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
10 Scroll to Measured flow and enter the corrected column flow
rate (in mL• min) from the run performed above.
11 Scroll to Unretained peak and enter the actual elution time
from the run performed above.
12 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.
CAUTION
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.