Maintenance . 101
Purging the Spectrometer
Purge the sample compartment if you need to make sure that no residual water vapor or CO
2
peaks are visible in the spectrum. The connectors are on the underside of the instrument
(Figure 83).
Figure 85 Location of purge connectors
Although connections are provided, under most circumstances you should not purge the
optical system. The Spectrum Two instrument was purged and then sealed after
manufacture. To purge the instrument you will need to break the seal on the instrument,
which will invalidate your instrument warranty.
You can purge with either dry air or nitrogen. Both remove water vapor; however, nitrogen is
preferable because it also removes atmospheric carbon dioxide.
A typical cylinder of dry nitrogen (or dry air) stores 6.26 m
3
at 1.4 × 104 kPa (220 ft
3
at
2200 lbf/in
2
). Make sure that the gas is free of oil, water, or dirt particles larger than 25 µm
(0.001 inch).
WARNING
AVERTISSEMENT
Do not site the instrument in a poorly ventilated area if nitrogen will be
used as a purge gas.
Oxygen depletion in an enclosed space does not trigger a gasping
reflex, and errors of judgment, confusion, or unconsciousness can
occur in seconds and without warning.
Ne placez pas l'instrument dans une zone mal ventilée si l'azote est
utilisé comme gaz de purge.
L'appauvrissement de l'oxygène dans un espace clos ne déclenche pas
un réflexe gonflant, et des erreurs de jugement, de confusion ou
d'inconscience peuvent se produire en quelques secondes et sans
avertissement.
purge connector
inlet port
Instrument purge
outlet port
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