10 Maintaining the TCD
To Bakeout Contaminants from the TCD
Maintaining Your GC 169
To Bakeout Contaminants from the TCD
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.
1 If the column is not installed, cap the detector.
Be careful! The detector may be hot enough to cause burns. If the detector is hot, wear
heat-resistant gloves to protect your hands.
2 Turn off the TCD filament.
3 If the column is attached to the inlet, maintain inert 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.
4 Set the reference gas flow rate between 20 and 30 mL/min.
5 Set the detector temperature to 375 °C.
6 Hold at 375 °C for several hours.
7 If the column is uninstalled, install it. See “To Install a Capillary Column in the TCD” on
page 166.
8 Load the analytical method.
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.
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