Running Experiments
TA I
NSTRUMENTS
TGA 29503–22
Use in an Oxygen-
Free Atmosphere
If you choose to perform TGA experiments in
an oxygen-free atmosphere, a few extra precau-
tions to the purge gas system and instrument
setup are necessary to ensure an oxygen-free
environment.
Purge Gas System
When performing TGA experiments in an
oxygen-free atmosphere, take the following
precautions:
Use a high purity, inert gas of grade 5 or
better. It may be necessary to use an
oxygen trap in-line, depending on the purity
grade.
Choose a 2-stage regulator of diaphragm
construction for high purity applications.
Use copper or stainless steel tubing from the
gas regulator, to the flowmeters, and to the
TGA purge inlet ports.
Allow the TGA to prepurge (under closed
conditions) for at least 30 minutes after first
turning on your purge gas.
Increase the standard purge rate during this
time to 100 mL/minute flow into the
balance chamber and 100 mL/minute into
the furnace.
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