Detectors 5
Advanced Operation Manual 187
uECD chromatographic speed (for fast peaks) can be
increased by increasing the makeup gas flow rate.
uECD temperature programming
The uECD 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 uECD
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 uECD 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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