An Overview of the Spectrum Two N . 21
Optical system
The optical system is under the main cover of the instrument. The instrument is sealed at the
factory, and the main cover of the instrument should not be opened.
No panel of the spectrometer should be removed unless following the maintenance
procedures described in this manual. In particular, maintenance procedures that risk ingress
of water vapor into the instrument should be performed only using the appropriate
maintenance wizard in Spectrum, Spectrum ES or AssureID Software. See
Maintenance
on
page 95 for more information.
Stability of the optical system
The system is purged and sealed at the factory. A supply of desiccant placed within the
system removes any water vapor and carbon dioxide that may enter. The unique humidity
shield design (part of the OpticsGuard™ system) protects the spectrometer from
environmental conditions, meaning it can be used in more challenging environments. In
addition, the internal humidity sensor, in conjunction with the Humidity Shield feature in
Spectrum software, warns you when the desiccant needs changing. Refer to
Humidity Shield
on page 82 for further information.
In the Spectrum Two N FT-IR spectrometer, CaF
2
windows separate the sample
compartment from the purged optical system.
You can purge the sample compartment with clean, dry, oil-free air or nitrogen. Either one
removes water vapor; however, nitrogen is preferable because it also removes atmospheric
carbon dioxide.
Sample compartment
The instrument has a versatile, purgeable sample compartment (Figure 4) located at the
front of the instrument. Open the sample compartment by lifting the cover using the recess
at the front.
Figure 4 Sample compartment
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