Thermo Scientific Omni FTIR Multi Gas CEMS Instruction Manual page 55

Operation
Imacc FTIR Software Suite (IFSS)
[C:\ Directory]
The IFSS reads and writes data files from several directories during data
collection and analysis.
C:\Backgrounds
Spectral scans of zero air are saved in C:\Background. The file being
currently used by the system is automatically named 'BKG.spa'. The system
will automatically collect a new zero spectrum file at a pre-set interval
controlled by the .script file. This directory can be observed to verify that
the system is automatically collecting background files on schedule, as well
as be used for post-processing of concentration data and trouble-shooting
sample system operation.
The BKG.spa file is a spectrum taken by the system on a reference sample
of "zero air." Zero air is ordinary room air that has been "scrubbed" of CO
2
and H O, as well as any of the other analytes that the Omni is detecting.
2
The purpose of taking the BKG.spa file is to have a clean reference of the
system's optical throughput so it can be compared to absorption caused by
the sample gas.
C:\CONS
Concentration data files are saved in the directory C:\CONS with the
suffix ".con". These files are Comma Separated Variable (.csv) files that
record a time-stamped record of analyte concentration as well as system
parameters such as sample system temperatures, cell pressure and detector
voltage.
C:\Layouts
.layout files, which set the configuration of the Monitor screen GUI are
saved in C:\Layouts. The system will have a pre-set OMNI.layout file.
C:\Methods
.method files, which control the analysis functions of the ImaccServer are
saved in C:\Methods. The system will have a pre-set OMNI.method file.
C:\Scripts
.script files, which call the .method file to run on the server, control the
timed operation of sample and data collection and are saved in C:\Scripts.
The system will have a pre-set OMNI.script file.
C:\Spec
There is the option to collect a time and date stamped spectrum file for
each minute's data point in C:\Spec. This allows for post-processing of the
data at any time in the future. There is also the capability to not save these
files.
Thermo Fisher Scientific Omni FTIR Multi Gas CEMS Instruction Manual 3-9