An Overview of the Frontier IR Single-Range Spectrometers . 27
CAUTION
Frontier IR spectrometers are fitted with sample compartment windows
that are composed of KBr or CsI that, although coated, can be damaged
by high levels of humidity.
If you spill a liquid in the sample compartment, wipe it up quickly. When
working with water-based samples open to the air, either purge the
sample compartment or leave the cover open.
CAUTION
For the Frontier FT-IR, a relative humidity higher than 80% (or 45% if
your instrument is fitted with CsI optics) can damage the windows of the
sample compartment. If you expect the humidity to exceed 80% (or 45%
if your instrument is fitted with CsI optics), continually purge or desiccate
the sample compartment.
Frontier FT-NIR spectrometers are fitted with sample compartment
windows that are composed of CaF
2
, which is relatively resistant to
humidity.
Open the sample compartment by lifting the cover using the recess at the front.
The infrared beam enters the sample compartment through an aperture on the left. After
passing through the sample, it enters the detector area through an aperture on the right side
of the sample compartment.
Standard accessories are mounted on a baseplate. The standard baseplate has a sample
holder located by a knurled screw.
Internal accessories
A wide range of optional MIR or NIR accessories, such as the Universal ATR accessory, fit in
the sample compartment (Figure 6).
Figure 6 Frontier IR with Universal ATR accessory
It is easy to remove an internal accessory and to replace it with another. See
Appendix 1:
Changing the Sampling Accessory
on page 90.
The instrument identifies the type of accessory fitted using a coded connector on its
baseplate that plugs into a socket on the rear wall of the sample compartment.
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