AquaLab 4 Series User Manual

AquaLab 7 VERIFICATION AND CALIBRATION
and support.
7.3 Multi-Point Calibration
(TEV Models, capacitance sensor only)
1. The capacitance sensor used for measuring the water activity of
materials with volatiles (AquaLab 4TEV models only) is a sec-
ondary method for measuring water activity and consequently
may require a slope change to the calibration in addition to a
linear offset. This is the case when the offset in capacitance
mode is different at high water activities than low water activ-
ities.
2. You need the 0.25 a
w
, 0.50 a
w
, 0.76 a
w
and 0.92 a
w
unsatu-
rated salt standards from Decagon to proceed with multi-point
calibration.
3. To perform a multi-point calibration, with the sensor type set
to Capacitance, select Calibration from the Configuration tab.
The Calibration screen prompts you with options.
4. Highlight Type and select Enter to toggle to multi-point. The
AquaLab guides you through the multi-point calibration rou-
tine through on screen commands.
5. Toggle to the Start button and press Enter to begin the multi-
point calibration. Once you press Enter, the Calibration screen
prompts you to insert a fresh standard and seal the chamber.
43

AquaLab 4 Series Specifications

General

Brand	AquaLab
Model	4 Series
Category	Measuring Instruments
Language	English