AquaLab 7 VERIFICATION AND CALIBRATION
second verification standard should be within ±0.003 a
w
.
7. If either of the verification standards is not correct, it is prob-
ably due to contamination of the sensor chamber. For cleaning
instructions, see Chapter 6. After cleaning, repeat verification
from step two.
8. If you are consistently getting readings outside the water ac-
tivity of your first verification standard by more than ±0.003
a
w
, a linear offset has probably occurred. In this case, adjust
the reading to match the correct verification standard value as
outlined in the next section.
Figure 3: Verification Standard Flowchart
Note: See the verification section in the operator’s manual for de-
tails. The Measure Verification Standard flowchart is a graphical
representation of the Verification of Calibration directions.
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