Finding the Right Water Activity Meter for Your Application

Some Considerations:

Accuracy
Government regulations (or your own product development specifications) may require that your product be within a certain water activity zone. If this zone is narrower than ± 0.015 a_w, you will need either the Series 3 or the Series 3TE.

Price
The four AquaLab models are excellent value for money. Call to speak with a Decagon representative about which model best fits your budget and application.

Frequency of Use
All of our water activity meters are resilient, but the Series 3 and Series 3TE are best for high-volume testing (20+ samples per day). Both feature a 3-year parts/labor warranty — an additional safety net for heavily used machines.

Portability
If you need to carry your instrument with you, the battery-powered Pa_wkit is ideal. The LITE requires an outlet, but comes with a carrying-case for easy transport.

Temperature Control
Water activity is temperature sensitive. The Series 3TE has internal temperature control. This is useful for:

• Studying effects of temperature on sample water activity.
• Government or company regulations on temperature-specific water activity measurement.
• R&D (accelerated shelf-life studies, etc.)
• Isotherm studies.
• When the ambient temperature is unstable.

This table compares the features of the four AquaLab models and the DA7200.

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