AquaLab
12. Troubleshooting
73
be done to speed up the process. Refer to Chapter 8 for fur-
ther explanation.
4) Your sample may contain volatiles. Volatiles are known to
cause unstable readings, because they condense on the sur-
face of the chilled mirror and alter readings. Please refer to
the volatiles section in Chapter 8 for hints on reducing di -
culties with measuring samples with propylene glycol. If you
have further questions regarding the measurement of vola-
tiles contact Decagon.
5) A fan blade in the block chamber may be broken or bent. If
even salt standards take a long time to read, and the sample
chamber is clean, you may have a broken chamber fan blade.
is is especially likely if you have just cleaned the chamber.
If you suspect this may have happened, contact Decagon for
details on replacement.
3. PROBLEM:
Water activity readings on veri cation standards are too high/low
and a linear o set adjustment cannot be made any higher/lower.
SOLUTIONS:
1) e thermopile in your chamber, which measures sample
temperature, may have become contaminated. Refer to Chap-
ter 6 for directions on cleaning.
2) e chamber mirror may be dirty. Refer to Chapter 6 for di-
rections on cleaning.
4. PROBLEM:
Message on screen displays the following:
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