286 Maintaining Your GC
14 Maintaining the NPD
To Bakeout the NPD
1 Bakeout the NPD with the column installed or
uninstalled. If uninstalled, gather the following (see
“Consumables and Parts for the NPD” on page 260):
• Capillary adapter (adaptable NPD only)
• Column nut
• No- hole ferrule
2 Load the GC maintenance method and wait for the GC to
become ready.
3 Set the bead voltage to 0, then turn it Off.
4 If the column is uninstalled, plug the detector connection
with the capillary adapter, 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 setpoint 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 268.)
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 285.
If using hydrogen as a carrier gas, turn off the hydrogen supply
and cap the end of the column to prevent an oven explosion.
Be careful! The detector may be hot enough to cause burns. If the
detector is hot, wear heat-resistant gloves to protect your hands.
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