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5. Reinsert the fuse holder.
Connect the Purge Gas Supply to the DSC 4000
The DSC 4000 has a system purge gas inlet and two sample purge gas inlets at the back of
the analyzer. The system purge gas purges the outer portion of the sample holder/heat
exchanger assembly with dry gas. This facility must ALWAYS be used when working with the
analyzer. The dry gas, preferably dry nitrogen, prevents condensation of water vapor on the
measuring cell. The system purge gas flow rate is controlled by a needle valve inside the
analyzer, and is preset to 40 ml/min.
NOTE: The DSC 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 01541498) or a Float Displacement Flow Meter (P/N 02901624) 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.
NOTE: The gas must be dry. A flow rate of between 20 and 40 ml/min is recommended.
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 lines to the DSC 4000.
Connect the Purge Gas and System Purge Gas Lines to
the DSC 4000
Perform the following procedure to connect your sample purge gas and system purge gas
lines to the DSC 4000 analyzer regardless of the other components in the purge gas line.
Install a DSC 4000 . 41
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