4 Installing 7890 GC Columns
To Calibrate the Column
7000/7010 Series TQ GC/MS Operating Manual 93
To Calibrate the Column
Capillary columns must be calibrated prior to use with the MS. This procedure
applies only to the 7890 GC.
Procedure
1 Set Data Acquisition for splitless manual injection and selected ion
monitoring (SIM) of m/z 28.
2 Press [Prep Run] on the GC keypad.
3 Inject 1 µL of air into the GC inlet and press [Start Run].
4 Wait until a peak elutes at m/z 28. Note the retention time.
5 In the Instrument Control panel, select Instrument > GC Configuration.
6 Select the Configuration tab.
7 Select the Column tab, click Inventory, and verify that the column you are
using is in inventory. Select the column to be calibrated and click Install
Selected Column.
8 Highlight the column in the inventory list and select Calibrate.
9 Select Calc Length.
10 In the Calculate Column Length dialog, enter the recorded retention time in
the Holdup Time field. Verify that the other 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. (See Figure 25 on page 94.)
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