Chilled Mirror Dewpoint Limitations - Decagon Devices AquaLab 4TE Operator's Manual

AquaLab
2. About AquaLab

Chilled Mirror Dewpoint Limitations

AquaLab's limitation is its ability to accurately measure samples with
high concentrations (typically >1%) of certain volatiles such as etha-
nol or propylene glycol, which can condense on the surface of the
chilled mirror. Th e extent of the eff ect is determined by how readily
the material volatilizes, which is both concentration- and matrix-
dependent. Th erefore, even if your sample contains materials that
could volatilize, it may still be possible to make accurate readings
using the chilled mirror dewpoint sensor.
AquaLab Series 4TEV which incorporates both a chilled mirror sen-
sor and a capacitance sensor for measuring volatile substances is
Decagon's solution for products containing volatile materials. If you
are unsure if you need the TEV model, please call and discuss your
product with a Decagon Representative. Refer to Chapter 8's section
titled "Volatile Samples" or call Decagon for more details.
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