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It may be necessary to repeat the cleaning steps again if the contaminant has only been
partially removed.
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 8: 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 9: 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.
