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in_hypalm_aw1_v3.doc
Using the AwQuick Mode
In the AwQuick mode, the HygroPalm AW1 uses an algorithm to project the full equilibrium value
(water activity) of the product sample. The measurement is automatically ended and typically
requires about 5 minutes.
The HygroPalm AW1 performs the following tasks:
1) the value of the humidity signal is constantly monitored
2) the stability of the temperature signal is constantly monitored
3) After an initial period of time (dwell time), the humidity data is used to project the end value
of the equilibration process (water activity). The measurement ends automatically as soon as
the projected Aw value is stable. At that time, the HygroPalm freezes the display.
With the default dwell time of 4 minutes, measurements typically require about 5 minutes. The
difference between the AwQuick mode and the full product equilibrium is typically 0.005 aw or
less. The value of the dwell time can be set by the user (see SETTINGS). This value represents a
trade off between speed of measurement and accuracy. Generally, a longer dwell time produces
more accurate results but causes measurements to take longer.
The value of temperature is the average temperature during the measurement. The HygroPalm
AW1 displays a trend indicator to the left of the temperature value. This is used to verify that
temperature is stable during the measurement.
When ready to measure:
1.
Press on the ENTER key on the keypad of the HygroPalm AW1. The display shows::
Note: numerical values are for illustration purposes only.
0. 2 9 5
A w
2 4. 8 3
q
C
Q 1 0 0 : 0 0 : 0 0 D
current
humidity value
current
temperature value
AwQuick mode is
in the dwell phase
HygroPalm AW1 is in the AwQuick mode
probe 1
is being displayed
elapsed time
hh:mm:ss
