84 Advanced User Guide
5 Detectors
µECD sensitivity can be increased by reducing the makeup gas
flow rate.
µECD chromatographic speed (for fast peaks) can be increased
by increasing the makeup gas flow rate.
µECD temperature programming
The µECD is flow sensitive. If you are using temperature
programming, in which the column flow resistance changes
with temperature, set up the instrument as follows:
• Set the carrier gas in the Constant flow mode. Set detector
makeup gas to Constant makeup.
• If you choose to work in the constant pressure mode, the
makeup gas should be set in the Column +makeup=constant
mode.
Setting parameters for the µECD
Verify that your detector gases are connected, a column is
properly installed, and the system is free of leaks. Set the oven
temperature and the inlet temperature and flow. Make sure your
carrier gas type is the same as that plumbed to your GC.
1 Press [Front Det] or [Back Det].
2 Set the detector temperature. To keep the µECD cell clean,
this temperature must be higher than the oven temperature.
3 Verify that the makeup gas type is the same as that plumbed
to your instrument. The gas type is in parentheses next to
the Makeup line on the parameter list. Change the gas type, if
necessary.
4 Enter a value for the makeup gas flow.
• If you are using packed columns, turn off the makeup gas.
• If your capillary column is defined, choose a flow mode and
set the makeup or combined gas flow.
• If your capillary column is not defined, only constant
makeup flow is available. Enter a makeup gas flow.
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