METER GROUP AquaLab 4TE - Page 61

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AQUALAB
Table 6 Troubleshooting the AQUALAB (continued)
Problem Possible Solutions
Readings are slow or
inconsistent
The sample chamber may be dirty. Refer to Section4.2 for
directions on cleaning the sample chamber.
The temperature difference between the sample and the block
chamber may be too great. Allow the sample to equilibrate to
instrument temperature. Refer to Section2.2.2.
Some products absorb or desorb moisture very slowly, causing
measurements to take longer than usual, and nothing can be done
to speed up the process. Refer to Section2.2.1.
The sample may contain volatiles. Refer to Section2.2.1.3 for
suggestions on reducing difculties with measuring samples with
volatile compounds.
A fan blade in the block chamber may be broken or bent. If salt
standards take a long time to read and the sample chamber is
clean, a broken chamber fan blade is the probable cause. Contact
Customer Support for details on replacement.
Water activity readings on
verification standards are
too high or too low and a
linear offset adjustment
cannot be made any higher
or lower
The thermopile, which measures sample temperature, may have
become contaminated. Refer to Section4.2 for directions on
cleaning.
The chamber mirror may be dirty. Refer to Section4.2 for directions
on cleaning.
Remove sample. Sample is
too hot! error message
The sample temperature is too high for the instrument to
equilibrate within a reasonable amount of time. Ensure samples are
at the same temperature as the instrument (Section2.2.2).
Displayed a
w
is below
instrument detection limits
The sample is too dry for the instrument to read accurately. If a
sample has a water activity that is less than the detection limits of
the instrument, this message appears. There is not enough sample
moisture to condense on the mirror and provide a reading.
The mirror may be dirty. Clean the mirror and chamber (Section4.2)
and measure the sample again.
Dew point sensor failure
error message
The cooler is damaged and needs to be serviced by METER. Refer to
Section4.4 for detailed instructions.
Crystal Failure. See
Manual for options.
error message
The crystal that runs the rmware is having trouble starting. Cycle
the power. If this message continues to appear, the instrument
needs to be serviced by METER (Section4.4).
Verification is not correct
Clean the sample chamber and mirror. Refer to Section4.2 for
detailed cleaning instructions.
If verication is still not correct, verify and adjust for linear offset
(Section4.1.2).
Contaminated mirror.
error message
Clean the chamber mirror (Section4.2) and run the sample again.
If this message continues to appear, contact Customer Support for
further options.