Setting Up the Detectors
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6. Set the Filter to 200.
The default setting for the filter is 200 milliseconds. If you want to improve
the signal-to-noise, change the setting to 800 milliseconds; however, the noise
improves but the peak shapes broaden. If you want a faster detector response,
change the setting to 50 milliseconds; however, the noise level may increase.
7. When all the settings are appropriate for your analysis touch OK. The NPD
tab screen will be now displayed with the changes you made in the
configuration screen.
NOTE: The flows listed in the above procedures for hydrogen and air are optimum for both
capillary and packed column flow rates. The optimum flow provides the best
sensitivity (signal to noise), selectivity, and bead life. Any changes to these flows
will affect all of these parameters. Also when using capillary columns, makeup gas
is not required.
NPD Bead Activation Procedure
Packed Column Setup:
Disconnect column and cap the oven end of the detector. The recommended
Detector Cap Nut is in the 1/8-in. Plug Kit (P/N N9300061).
Capillary Column Setup:
With a capillary column connected, adjust Carrier flow to 0.5 mL/min or less
(but not 0 ), or (preferred) disconnect the column and cap the oven end of the
detector.
Reactivating a Used NPD Bead
Preparing to Activate the NPD Bead
To activate a NPD bead:
NOTE: Never activate a NPD bead with a column connected to the detector fitting. To
properly activate the NPD bead, the column must be removed from the detector
fitting and the detector fitting must be capped.
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