TA I
NSTRUMENTS
TGA 2950
Installing the 2950
2–18
Use of an explosive gas as a purge gas is
dangerous and is not recommended for this
instrument. For a list of the purge gases that
can be used with the TGA instrument, see
Chapter 1. Oxygen may be used as a purge
gas, but the furnace must be kept clean of
volatile hydrocarbons to prevent combustion.
3. Connect a length of 1/4-inch I.D. flexible
tubing from each of the PURGE fittings to a
flowmeter (consult your compressed gas
vendor for specific requirements). Then
connect each flowmeter to the purge gas
source.
4. The recommended setting for the purge rate
is 100 mL per minute or less. The flow
distribution should be as follows: (a) for the
standard furnace, 40 percent to the balance
chamber and 60 percent to the furnace, and
(b) for the EGA furnace, 10 percent to the
balance and 90 percent to the furnace.
Cooling Gas Line
1. Locate the COOLING GAS fitting, a 1/4-
inch compression fitting on the left side of
the TGA cabinet back, marked with a 120
psig maximum warning label (Figure 2.10).
Figure 2.10
TGA COOLING
GAS Fitting
!
WARNING
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