AquaLab TDL 5 MENUS
ing, press the cancel button). The Mode screen now has the updated
custom settings at the top of the screen. Press the Save button to
return to the Configuration screen and begin using the custom mode
(To exit without updating, press the Cancel button).
Low Emitting Mode: This mode is for samples that are slow to
equilibrate such as vegetable oils, high fat samples, and high viscosity
samples. AquaLab determines vapor equilibrium at the end of a test
by comparing sequential water activity values, looking for a trigger
value difference less than 0.0005 a
w
. This very strict requirement is
needed to ensure that the instrument provides the necessary accu-
racy. The low emitting mode gives the option of speeding up test
time by adjusting the equilibrium trigger value. The typical setting
is two water activity values that are within ±0.0005 a
w
of each other.
This value can be adjusted to any value between 0.0003 and 0.0030
a
w
.
Increasing the trigger value causes a subsequent reduction in instru-
ment accuracy and precision, but results in a shorter test time. In
certain cases, this loss in performance may be acceptable in order to
speed up the analysis time. We recommend using using high trigger
only after careful consideration of the impact on test results.
Date
AquaLab TDL models have an internal calendar and clock. The
time and date are recorded with each water activity reading. Press-
ing Enter when the Date option is highlighted allows you to set the
date in the instrument. Press the left and right arrows to change
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