TA Instruments TGA 2950 Operator's Manual page 100

Technical Reference
4–10
The stainless steel furnace housing has a purge
opening on either side to allow gas flow or
evacuation. Purge gas enters through a purge
fitting on the right side of the furnace housing. It
then passes through an opening in the heater,
flows around the sample pan, and exits through
openings on the opposite side of the furnace
housing and heater. From here, the evolved gas
can be sent through appropriate connections to
an external analyzer, if desired.
The heater is a resistance-wound unit of low
thermal mass alumina material that can be
heated and cooled rapidly. Controlled heating
rates of up to 100°C per minute can be obtained,
to an upper limit of 1000°C.
Cooling air enters through the holes in the base
of the furnace assembly at the completion of test
runs, if desired.
A Platinel II* thermocouple extends through
the bottom of the balance chamber, down along
the hang-down wire, and is positioned just above
the sample pan, where it monitors the sample
environment temperature.
The furnace base moves the furnace assembly
up around the sample pan to the closed position,
or down away from the sample pan to the open
position.
TA I TGA 2950
NSTRUMENTS