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Troubleshooting
26
Thermo Fisher Scientific
Low infrared throughput is a problem you may encounter with your
TGA-IR Module. To help recognize when this is happening, you
should keep a record of peak-to-peak interferogram voltages, single-
beam spectra, performance test results (see "Checking performance"
in the "Using the TGA-IR Module" of this manual), and 100% lines.
You should also record the cell temperature, the number of scans and
the resolution. By keeping track of this information, you can monitor
the system integrity over time.
The following table lists some possible causes of low throughput and
some solutions you can try to correct the problem:
Possible Cause
The MCT detector
is not properly
cooled.
The spectrometer
is misaligned.
The gas cell or cell
windows are
contaminated.
Spectrometer
components have
failed.
Solution
Cool the detector properly. (This applies
only if you have an optional MCT
detector.) See "Cooling the detector" in the
"Using the TGA-IR Module" chapter of
this manual.
Align the spectrometer. (For more
information, see the "Aligning the
spectrometer" topic in the OMNIC on-line
help system.)
Clean the gas cell or cell windows. (For
more information, see the TGA-IR Module
Gas Cell Service Guide that came with your
TGA-IR Module.)
See the on-line Spectrometer Help Topics
available through the Help menu in
OMNIC. Open the Troubleshooting book
on the Contents tab and make a selection
from the list of topics there.
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