To Bakeout Contaminants From The Tcd - Agilent Technologies Agilent 7890 Series Maintenance Manual

12
Maintaining the TCD

To Bakeout Contaminants from the TCD

C A U T I O N
WA R N I N G
WA R N I N G
WA R N I N G
240
The bakeout can be performed with the column installed or
the detector capped.
If the column is not installed, you must turn off the TCD filament and
cap the detector column fitting to prevent irreparable damage to the
filament caused by oxygen entering the detector.
If the column is not installed, cap the detector.
1
Be careful! The detector may be hot enough to cause burns. If the
detector is hot, wear heat-resistant gloves to protect your hands.
Turn off the TCD filament.
2
If the column is attached to the inlet, maintain inert
3
carrier gas flow through the column.
If using hydrogen as a carrier gas, turn off the hydrogen supply
and cap the end of the column to prevent an oven explosion.
Set the reference gas flow rate between 20 and
4
30 mL/min.
Set the detector temperature to 375 °C.
5
Hold at 375 °C for several hours.
6
7 If the column is uninstalled, install it. (See
Capillary Column in the TCD"
Load the analytical method.
8
Be careful! The oven or detector fittings may be hot enough to
cause burns.
9 Allow the oven, inlet, and detector to equilibrate at
operating temperature, then re- tighten the fittings.
"To Install a
on page 234.)
Maintaining Your GC