TA I
NSTRUMENTS
TGA 2950 3–23
Instrument Set-Up
When performing TGA experiments in an
oxygen-free atmosphere, take the following
steps to set up your instrument:
Readjust your flowmeter(s) for standard
operating flow rates: (a) for the standard
furnace, 40 mL/minute flow into balance
chamber and 60 mL/minute into the furnace
or (b) for the EGA furnace, 10 mL/mintue
into the balance chamber and 90 mL/minute
into the furnace.
Tare sample pan (as needed).
Load sample and close system
Purge 20 minutes, if possible, before
starting a run.
When run is complete, allow the furnace to
cool in the closed position until the temp-
erature is less than 350
°
C. This can be
automatically programmed into your
method; after last segment add an
equilibrate at 350
°
C step. Another option is
to change method end conditions to leave
furnace closed at method end.
When using air or oxygen during an
experiment, introduce new gas through
furnace purge port only and switch back to
nitrogen before cooling down.
When the TGA is idle, leave the system closed and
continue purging with nitrogen.
Use in an Oxygen-Free Atmosphere
NOTE:
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