Appendix D
TA I
NSTRUMENTS
TGA 2950D–22
Cleaning the
Quartz Furnace Tube
If the TGA is used to evaluate materials using
an oxygen purge, the furnace should be
cleaned routinely to prevent build-up of volatile
hydrocarbon residues that could combust.
Do not touch the furnace sample tube with
your bare fingers. Skin oils may cause
devitrification of the quartz glass, resulting
in severely reduced sample tube life. Do
not insert metallic instruments inside the
sample tube to scrape or chip contaminants
from the sample tube as breakage may
result.
To clean the furnace quartz sample tube, use the
following procedure:
Do not disturb the hangdown wire and
furnace thermocouple located directly
above the furnace when cleaning the fur-
nace, as damage may result.
1. Press the FURNACE key to open the
furnace completely.
2. Remove any sample pans.
3. Remove the rubber cap located on the
underside of the furnace base.
4. Place a small cup under the furnace tube.
Rinse the furnace tube using a solvent (such
as alcohol) to remove debris. The solvent
will drain out of the bottom of the tube into
the cup.
!
WARNING
!
WARNING
!
WARNING
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