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System Component Description
FTIR
Detector
The FTIR analyzer is configured with a TE cooled DTGS detector with
Potassium bromide (KBr) window, which provides usable data in the range
between 12,500 cm-1 and 350 cm-1.
Note The KBr window material is hygroscopic, or absorbs water from the
air, so the FTIR instrument must be continuously purged to remove
water.
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Gas Cell
The FTIR analyzer is using a gas cell with a 5.2 meter optical path length.
The standard gas cell is a general-purpose, low-pressure gas cell, designed to
be used with a variety of sample gases and sampling environments. This gas
cell is suitable for use in both ambient and elevated temperature conditions,
operating reliably at temperatures up to 185 °C. The gas cell is fitted with
zinc selenide (ZnSe) sample windows.
Figure 7–8. Major System Components
Gas Cell Heating
The 5.2-meter gas cell is supplied with a heating jacket. The heating jacket
can maintain the gas cell at a constant temperature to improve quantitative
Jacket
accuracy and prevent condensation of sample gases. The heating jacket is
designed to heat the gas cell to a temperature of 185 °C.
Thermo Fisher Scientific
Omni FTIR Multi Gas CEMS Instruction Manual
7-11
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