Agilent Technologies 6850 Series II User Information page 185

Thermal cleaning (bakeout)
Caution 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.
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Replacing the TCD flow module
Tools and materials
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•
To remove the flow module
Warning Be careful! The oven and/or detector may be hot enough to cause burns.
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Caution
Use electrostatic discharge precautions during this procedure.
Released: March 2004
Turn the detector off using a Control Module, ChemStation/Cerity
Chemical, or other control device.
Remove the column from the detector and cap the detector column fitting.
Set the reference gas flow rate between 20 and 30 mL/min. Set the detector
temperature to 375°C.
Allow thermal cleaning to continue for several hours, then cool the system
to normal operating temperatures.
7/16-inch wrench
T-20 Torx driver
Load the SERVICE method or reset the detector and oven temperatures to
OFF or turn the main power switch off. Let the heated zones cool to room
temperature.
Turn the detector pressure off at the source.
Turn off the instrument and remove the power cord.
Turn off all supply gases at their sources.
Disconnect all gases from the bulkhead connectors on the back of the
instrument.
Remove the lid top cover.
6850 Series II GC User Information
Routine Maintenance: Detectors
Maintaining a thermal conductivity detector (TCD)
page 185 of 256