Setting Up the Detectors
4-22
NOTE: If you want to switch between an FID and an ECD, when using the same packed
column injector, use nitrogen as the carrier gas for both detectors. Argon/methane
is not recommended for use with an FID because it produces a high background,
more noise, and a wandering baseline
NOTE: To minimize detector contamination, run the ECD hot, at a temperature of at least
375 ºC.
NOTE: You may experience high background readings when working with capillary
columns. The high background may be caused by liquid phase bleeding off the
detector end of the column (at a typical temperature of 375 °C or higher). In some
cases the polyimide coating of the column may also cause a high background
reading when using the ECD.
You can correct this situation by installing a glass-lined receiver (P/N N6000968).
The glass-lined receiver terminates in a 1/16-inch fitting so that it can accept
capillary columns with an i.d. of 530 microns or less.
If you suspect that the background is caused by column liquid phase bleeding,
install the glass-lined receiver in the detector base. Then insert the column end just
beyond the ferrule and connect it to the receiver.
If you suspect that the background is caused by the polyimide, insert the column
through the glass-lined receiver until it is flush with the end of the receiver. Then
insert the receiver into the detector base. This shields the column from the make-up
gas flow.
ECD Set Up
To set up an ECD, read the ECD setup summary, then follow the steps.
ECD Setup Summary
To set up an ECD:
• Vent the ECD outlet.
• Adjust the make-up gas flow (PPC and manual pneumatics).
• Make sure a column is installed
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