9 TAKING A READING AquaLab
9 Taking a Reading
9.1 Measurement Steps
Once you have verified for cleanliness, calibration, and prepared your
sample, you are ready to take readings. Follow steps 1 through 4.
1. Move the chamber lever to the Open position and lift the cham-
ber lid.
2. Check the top lip and outside of the sample cup to make sure
they are free from sample residue and that the sample cup is
not overfilled.
Note: Over-filling the sample cup may contaminate the cham-
ber sensors.
3. Place your prepared sample cup in the chamber. The sam-
ple cup lid must be removed while in the testing chamber for
correct functionality.
4. Close the chamber lid and move the lever to the Read position.
This seals the chamber and start the reading.
In one to two minutes, the first water activity measurement displays
on the LCD (this is an intermediate reading and not the final water
activity). Length of read times may vary depending on tempera-
ture differences between the chamber and your sample, and other
properties of your sample.
9.2 How AquaLab Takes Readings
The AquaLab reading cycle continues until the rate of change of
three consecutive readings are less than 0.0005 a
w
of each other.
The instrument crosses the dew threshold numerous times to ensure
equilibrium and the accuracy of readings. When the instrument has
finished its read cycle, the water activity and read time displays, the
Store icon replaces the spinning measurement icon, and, if enabled,
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