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5.
Water activity measurement
5.1. Carrying out „aw"-measurements
•
Switch on the LabSwift-aw as described in chapter 3.2..
•
The system carries out a self-test („S TST"). Thereby the software version
is shown on the upper display line.
•
After the self-test the sensor is warming up („WARMUP"). Has the warm-
up finished the instrument is ready for the first aw-measurements of a
sample.
Note :
The warm-up time mainly depends on the present humidity and the ambient
temperature. Generally this time is 2 to 3 minutes.
•
During the warm-up stage the measurement can be already started. But
there will be no output of measurement data until the warm-up is finished.
•
Fill the sample cup with the material to be measured. The sample cup must
be completely clean and dry (rub dry with tissue paper if necessary)!
Ideally, always use a fresh cup and dispose of it after use.
Important!
Fill the sample cup to approximately 2/3 with the product to be measured. Do
not overfill the sample cups ! Bulkier material must be suitably crushed or
manually cut into small pieces. Products consisting of several layers, or an
outer coating, must also be crushed (e.g. confectionery products). Prolonged
hand contact with the product must be avoided (falsification of measured
value!). A grinder, if used, must not warm up the product.
•
While placing the sample in the measuring chamber, open the cover and
place the sample dish carefully inside. Be aware about powder samples
that the product will not contact the measuring head or measuring cell.
Note:
Do not move the instrument while a sample is in it, to avoid overflow.
•
Close the cover of the LabSwift-aw instantly again.
17
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