Replace The Sample Compartment Windows - Thermo Scientific Nicolet Summit User Manual

Replace the Sample Compartment Windows

Thermo Scientific
The Thermo Scientific™ Nicolet™ Summit FTIR Spectrometer has windows on both sides of
the sample compartment that seal the instrument from moisture and other contaminants but
allow the infrared beam to enter and exit the sample compartment. The windows should
always be installed, even if your system is purged with dry air or nitrogen.
WARNING Prevent fire and explosion. The infrared source inside the instrument is an
ignition source. If you are using volatile solvents, provide a fume hood or other active
venting system that is free of spark and other ignition sources and prevents flammable
vapors from collecting in the atmosphere surrounding the instrument.
We install potassium bromide (KBr) windows at the factory and run all of our operating and
performance tests with the windows installed. The KBr windows are hygroscopic but have a
protective coating. On this spectrometer, they provide a working spectral range between
-1
8,000 and 350 cm with no significant optical absorptions lines.
If you purchased your spectrometer with zinc selenide (ZnSe) windows, the spectrometer is
delivered with KBr windows installed. You must install the ZnSe windows yourself using the
instructions below. ZnSe windows are non-hygroscopic, which makes them more suitable for
extremely humid environments when the spectrometer is not purged. They have an
anti-reflection coating to optimize performance and, on this spectrometer, provide a working
spectral range between 7,800 and 500 cm
-1
.
Nicolet Summit User Guide 68