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40 . TGA 4000 Installation and Hardware Guide
5.
Reinsert the fuse holder.
Connect the Purge Gas Supply to the TGA 4000
The TGA 4000 has two sample purge gas inlets and a system purge gas inlet at the back of
the analyzer. The system purge gas must be a dry inert gas; preferred gases are nitrogen
and air (the latter only when measurements are performed in oxidative atmospheres). The
dry inert gas flows through the balance chamber to maintain a constant environment, to
prevent absorption or desorption of vapors, and to protect the balance against gaseous
products that evolve from the samples. The system purge gas must be present in the
balance chamber at all times. The system purge gas flow rate is controlled by a needle valve
inside the analyzer, and is preset to 40 ml/min. The system has an equilibration time of more
than 1 hour so you should leave this flow on permanently if the analyzer is used frequently.
NOTE: The TGA 4000 analyzer has a mass flow controller built into the analyzer. However, if
you have an autosampler and are using the dry box purge, this does not have a mass
flow controller. Therefore, it is necessary to use either an H restrictor
(P/N 0154-1498) or a Float Displacement Flow Meter (P/N 0290-1624) to obtain the
proper flow rates. The gas must be dry. A flow rate of between 20 and 40 ml/min
is recommended.
The sample purge gas inlets (A and B) are used to purge the furnace, and are part of the
internal gas selector (which has two inlets and one outlet). Argon or nitrogen of 99.9%
minimum purity is recommended for purging the sample area. Other gases such as air or
oxygen may also be used. The flow rate of the sample purge gas is controlled using the
software. The sample purge (reaction) gas enters the furnace directly below the sample and
flows via the furnace wall to the sample. The reaction gas purges the sample holder/furnace
area. Since the furnace and sample holder are ceramic, any noncorrosive gas can be used.
The flow rate of the sample purge gas is controlled using the software.
NOTE: The gas must be dry. A flow rate of between 20 and 40 ml/min is recommended.
The flow rate should not exceed the flow rate of the system purge gas.
The procedure for connecting the purge gas supply includes the following steps:
•
Connect the purge gas line to the system gas supply.
•
Install a filter dryer (optional).
•
Connect the Purge Gas and System Purge Gas Lines to the TGA 4000.
Содержание TGA 4000
Страница 1: ...TGA 4000 Installation and Hardware Guide THERMAL ANALYSIS ...
Страница 5: ...Introduction ...
Страница 7: ...Safety and Regulatory Information ...
Страница 17: ...Prepare the Laboratory ...
Страница 20: ...20 TGA 4000 Installation and Hardware Guide ...
Страница 21: ...Install Multiple Analyzers ...
Страница 24: ...24 TGA 4000 Installation and Hardware Guide ...
Страница 25: ...Install a TGA 4000 ...
Страница 54: ......
Страница 55: ...TGA 4000 Hardware ...
Страница 67: ...AS 6000 Autosampler ...