Maintaining the NPD 11
Maintaining Your GC 231
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 208):
• 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 216.)
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 230.
12 Start the NPD bead Auto Adjust process. See the 7820 Series
Advanced User Guide for details.
WARNING
If using hydrogen as a carrier gas, turn off the hydrogen supply
and cap the end of the column to prevent an oven explosion.
WARNING
Be careful! The detector may be hot enough to cause burns. If the
detector is hot, wear heat-resistant gloves to protect your hands.
To Next Page
Loading...
Need help?
General
