Thermo Scientific MIRAN 205B Series Instruction Manual page 141

Wavelength
(μm)
General Hydrocarbons
3.333
Other Fixed Filters
1.859, 3.573, 4.004, 4.250, 4.500, 4.620
8.000
11.000
14.000
Resolution becomes very important if two compounds have absorbance close together in
the infrared spectrum. When monitoring for one compound, it is important that the peak
for the other compound not interfere in the analysis.
The fundamental concepts are the same, whether it is a single beam infrared analyzer
such as the SapphIRe Analyzer, or a double-beam laboratory instrument. The major
differences between the two types of instruments are portability and resolution. The
SapphIRe Analyzer is designed as a portable unit to be used in the field for quantitative
work. The design is geared towards a high energy through-put to enable detection of
gases and vapors at very low concentration levels (often below 1 ppm).
Chapter 13 Infrared Spectroscopy Tutorial
Table 13-1. Wavelength Ranges
Bandwidth
(%)
3.3
1.5
2.7
2.3
2.0
13-21
Bandwidth
(μm)
0.11
0.06 at wavelength of 4.0
μm
0.22
0.25
0.28