12 TROUBLESHOOTING AquaLab TDL
explanation.
3. PROBLEM:
Water activity readings on verification standards are too high/low
and a linear offset adjustment cannot be made any higher/lower.
SOLUTIONS:
1. The IR Sensor in your chamber, which measures sample tem-
perature, may have become contaminated. Refer to Section 6
for directions on cleaning.
2. The TDL lenses may be dirty. Refer to Section 6 for directions
on cleaning.
4. PROBLEM:
Message on screen displays a warning that the sample is too hot.
SOLUTION:
Your sample temperature is too high for the instrument to equili-
brate with it in a reasonable amount of time. The instrument and
sample need to be in temperature equilibrium before accurate mea-
surements can be made. Therefore, very cold samples take a very
long time to measure for the same reason. To avoid this problem,
make sure to only measure samples that are at the same temperature
as the instrument.
60
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