12 Maintaining the NPD
To Bakeout the NPD
202 Maintaining Your GC
To Bakeout the NPD
If using hydrogen as a carrier gas, turn off the hydrogen supply and cap the end of the column
to prevent an oven explosion.
1 Bakeout the NPD with the column installed or uninstalled. If uninstalled, gather the
following, see “Consumables and Parts for the NPD” on page 186:
• Column nut
• No-hole ferrule
2 Place GC in maintenance mode: Maintenance > Instrument > Perform Maintenance >
Maintenance Mode > Start Maintenance. Wait for the GC to become ready to continue (all
zones cooled to safe handling temperatures).
Be careful! The detector may be hot enough to cause burns. If the detector is hot, wear
heat-resistant gloves to protect your hands.
3 Turn off the bead.
4 If the column is uninstalled, plug the detector connection with the column nut, and no-hole
ferrule.
Maintain inert carrier gas flow through the column, or remove the column from the GC.
5 Set normal operating flows.
6 Set the detector temperature at 25 °C above the typical method set-point temperature.
7 Set the oven temperature to 250 °C or 25 °C above the normal maximum operating
temperature. Do not exceed the column’s temperature limit.
8 Hold at temperature for 15 to 30 minutes.
9 If the column is not installed in the NPD, install it. See “To Install a Capillary Column in the
NPD” on page 189.
10 Restore the analytical method and allow the NPD to equilibrate at operating temperatures
and flows for 10 to 30 minutes.
11 Check the NPD leakage current. See “To Check the NPD Leakage Current” on page 201.
12 Start the NPD bead Auto Adjust process.
13 Exit maintenance mode. Select Maintenance > Instrument > Perform Maintenance >
Maintenance Mode > Finished.
Allow 1 to 2 hours for a new Blos bead to equilibrate.
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