Agilent Technologies 7820A Manual page 206

10
Maintaining the µECD
206
If the column maximum temperature is < 250 °C, remove the
4
column from the detector.
If the column is uninstalled, plug the detector connection
5
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.
Check the µECD output value on the control table. It should
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be lower than the first reading. If it is not, contact your
Agilent service representative.
Reinstall the column.
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Restore the analytical method.
11
Maintaining Your GC