AquaLab TDL 7 VERIFICATION AND CALIBRATION
4. Carefully close the lid and move the lever to the Read position.
Press the Check icon button to begin testing.
Note: If you decide at this point not to continue with the linear
offset program, just return the lever to the Open position or
press the cancel button to return to the previous screen.
5. After your AquaLab has finished measuring the verification
standard, it displays a Change the Offset screen.
6. Press the up and down arrows to adjust the water activity read-
ing to its proper value for the particular verification standard
you are measuring. When the correct value is displayed, press
the Save icon button to store this new value. To cancel without
saving changes and return to the main menu, press the Cancel
button.
7. Re-measure the verification standard again in normal sampling
mode. It should read the proper value (within ±0.005 a
w
) at a
given temperature for your particular standard. (See Appendix
B for temperatures other than 25
◦
C.)
Measure the water activity of a second verification standard accord-
ing to the verification procedure described above. If both verification
readings are within ±0.005 a
w
then the instrument is ready to be-
gin testing. If you still have incorrect verification standard readings
after cleaning the chamber and adjusting for linear offset, contact
METER by email at support.food@metergroup.com or by phone at
509-332-5601 for further instructions. If you purchased your METER
39
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