AquaLab 12 TROUBLESHOOTING
(b) The control temperature is significantly different than the
isotherm temperature. Make sure that the sample wa-
ter activity and the instrument controlling temperature
are within the scope of the selected moisture sorption
isotherm model.
Diagnostic Screen
If, after cleaning your instrument and reading the other troubleshoot-
ing hints, you have reason to believe that one of the components of
your AquaLab may be causing measurement error, you may access
a screen that will display values for component performance. Cus-
tomers can access this Diagnostics screen by navigating to the Con-
figuration tab and then by scrolling down to the diagnostics option.
Press Enter and you will be given a list of components and their
values.
This screen shows typical values for the dew point method. Lid, base
and sample temperatures may fluctuate but should not change more
than 0.03 degrees. Typical ranges for the lid, base and sample tem-
peratures is between 24.5 and 25.5 degrees.
If the mirror temperature is at lid temperature, the cooler has failed
and must be replaced. If the mirror is below the lid temperature or
appears to be random, the thermocouple wire is broken and must be
repaired. A typical optical range is between 500 mV and 2900 mV.
For capacitance mode, not shown here, the RH percentage should
always be between 0 and 100%.
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