Selecting
a
purge
gas
Dry air and nitrogen are equally effective in eliminating water vapor
and volatile solvents, but nitrogen is more effective against carbon
dioxide. The purge gas must be free
of
moisture, oil and other
reactive
materials.
To
remove
particulate
matter
and
oil,
you
may
need to install a 10-micron filter. Dry air or nitrogen supplied for
purge should be dried to a dew point
of
-70°C (-94 °F) or below for
best performance .
.A.
Caution Do not use Argon as a purge gas. Argon is a good insulator and
prevents the laser from cooling properly. This significantly shortens
the life
of
the laser and can also cause the source to overheat. •
A Warning Never use a flammable, combustible or toxic gas to purge the
spectrometer. •
Installing
purge
gas
fittings
If
you plan to purge the spectrometer, install the purge line and the
necessary fittings before the spectrometer arrives (see the illustration
below). The source line pressure should be at least 20 psig and
must
not exceed 100 psig.
20
Nicolet
-----
Either 1/4" male fitting
or
3/8" female fitting
Supplied
by
you
A pressure regulator and flowmeter will be installed by Thermo
Nicolet to maintain a line pressure
of
10
to 20 psig at the flowmeter
inlet and a flow rate
of
15
scfh for optimal data collection.
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