206 Maintaining Your GC
10 Maintaining the µECD
4
If the column maximum temperature is < 250 °C, remove the
column from the detector.
5 If the column is uninstalled, plug the detector connection
with the column nut and no-hole ferrule.
Maintain inert carrier gas flow through the column, or
remove the column from the GC.
6 Set the µECD temperature to 350 to 375 °C, the makeup gas
flow to 60 mL/min, and the oven temperature to 250 °C. If
the column is uninstalled, leave the oven off to protect the
column.
7 If the column is installed in the µECD, set the oven
temperature to 250 °C. If the column is uninstalled, leave the
oven off to protect the column.
8 Allow thermal cleaning to continue for several hours and
then cool the system to normal operating temperatures. The
figure below shows detector output during a typical cleaning
cycle.
9 Check the µECD output value on the control table. It should
be lower than the first reading. If it is not, contact your
Agilent service representative.
10 Reinstall the column.
11 Restore the analytical method.
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