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AQUALAB VSA
7.7 RUNNING A WATER ACTIVITY TEST
Note: The Water activity test cannot be done when the isotherm test is running
You can also use the AQUALAB VSA as a water activity meter. For best results and
temperature control, METER recommends using a clean stainless steel cup for water activity
testing and that you remove the weighing pan and place the cup directly on air cylinder
when testing for water activity. If you set volatiles to yes, the VSA determines water activity
readings using the capacitance sensor, otherwise, it uses the dew point sensor.
1. From the Measurement tab, move latch left and reading starts automatically. The pinwheel
spins when taking a measurement. Pressing the Enter button also starts a reading.
2. The a
w
reading for the sample and the temperature displays when the VSA finishes.
3. Toggle the Volatiles Yes/No option in the Configuration menu to change between dew
point and capacitive readings (Volatiles = Yes → Capacitive Sensor, Volatiles = No → dew
point sensor).
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