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12.2 Cross Verification using 0.754 Aw
standard:
1. Open the lid of the calibration jar. Open the lid of the Aw standard and
place the whole plastic jar on top of sponge inside the calibration jar.
Quickly close the plastic jar using the sensor head of the water activity
measuring chamber.
2. Make sure the other end of Aw sensor is connected to the RH2 meter
and turn the device ON.
3. Change the scales to Water Activity (Aw) using UP and DOWN arrows.
Let the whole set-up stay there until you see a stable reading on the
screen (could take around 10 to 20 minutes to stabilize).
ATTN:
If the meter reads within the tolerance of standard so/-0.02
(i.e., Aw between 0.734 and 0.774), then Recalibration is not required. If
it differs from that tolerance range, we recommend carrying out a
recalibration as follows
(
12.3 Performing a recalibration
):
