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12.3 Performing a recalibration
To be done:
Only when the
deviation revealed is higher than 2% relative air
humidity (i.e., +/-0.02AW while cross checking with the .754 saturated standard in
the earlier page).
To do so:
All of the options must be activated (see
"10.5 Activating options"
). Use Aw
standards 0.500 (50% RH) or 0.800 (80% RH) calibration vials (one time use vials).
Contact Scigiene if you do not have the standards.
ATTN
: To begin recalibration the AW meter should be RESET and AUTO-OFF
time adjusted. Please follow the following steps:
1.
Press
twice or hold for 2 seconds.
2.
Select
Options
. To do so, press
or
and confirm by pressing
.
3.
Select
Reset
(input password if asked
–which is serial number of your device).
Once you select reset a prompt will ask to confirm. Select the checkmark sign
to confirm Reset.
4.
Press
twice or hold for 2 seconds to go to the main Menu.
5.
Select
Options
and Scroll to find “Auto OFF Time”. Select and set it to 5 mins.
6.
Press
twice to go back to main menu
12.3.1 Determination of calibration values
To be done:
Microsoft Excel calculation sheet is required (available via email, on
request by phone or by email to
4865).
To do so:
Begin with 0.500Aw vials (50% RH). Make sure to bring the vial to
room temperature similar to other components of calibration set up.
-
Open one vial and pour the liquid on one of the clean sample cup (screw-top
Nalgene jar).
-
Place the Nalgene jar containing 0.500 standard on top of the sponge inside
the calibration Jar. Quickly close the calibration jar using the sensor head of
AW measuring chamber.
1.
Press
twice or hold for 2 seconds.
