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2.4.2. Recognising if the probe is clean
When looking to see if the instrument is clean, the primary area of interest within the spectrum
is between 800 and 1800 cm
-1
. This section of the absorbance plot should maintain a relatively
flat line with no consistently repeating peaks. Cleaning Mode can be used to see the effects
of the cleaning process in real time
– see
DOC0893 KeitSpec Software User Manual,
Section
2,
The Spectrometer Tab
.
Figure 7: A clean probe showing no significant peaks within the
800 to 1800 cm
-1
region.
Several sharp peaks in the region 800-1800 cm
-1
indicate that the probe has not been cleaned
properly.
Figure 8: Sharp spikes within the region indicating an unclean probe
A peak at 1400 cm
-1
indicates that there is some water on the probe. This could indicate poor
purge quality.
