AquaLab 4TE Dew Point Water Activity Meter

The AquaLab 4TE Dew Point Water Activity Meter is a precision laboratory analytical instrument designed to measure water activity (aw) in food products, pharmaceutical preparations, biological materials, chemicals and other moisture-sensitive samples. Manufactured originally by Decagon Devices, the AquaLab series is now associated with METER Group and its AquaLab product range.

The AquaLab 4TE uses advanced chilled-mirror dew point technology to determine water activity directly. This measurement principle provides reliable and repeatable results for laboratories involved in quality control, product development, stability testing and scientific research. Unlike conventional moisture measurement methods that determine the total moisture content of a material, water activity measurement evaluates the availability of water within a sample.

Water activity is an important parameter in determining the stability, safety, shelf life and quality of various products. It influences microbial growth, chemical reactions, enzymatic activity, oxidation and other processes that can affect product performance and storage conditions. The AquaLab 4TE helps researchers and quality-control professionals monitor this parameter accurately.

One of the main advantages of the AquaLab 4TE is its chilled-mirror dew point measurement system. During operation, a sample is placed inside a disposable sample cup and positioned in the instrument's measurement chamber. The instrument establishes equilibrium between the sample and the air inside the sealed chamber. A chilled mirror sensor detects the dew point temperature of the air above the sample, while an infrared temperature sensor measures sample temperature. The instrument then calculates the water activity from the relationship between the dew point and sample temperature.

The AquaLab 4TE offers a water activity measurement range of 0.0300 to 1.0000 aw, with a resolution of 0.0001 aw and an accuracy of approximately ±0.003 aw in dew point mode. These specifications make it suitable for demanding laboratory measurements where precise water activity determination is required.

Another important feature is its integrated temperature control system. The instrument allows users to control sample measurement temperatures from 15°C to 50°C. This capability is particularly useful because water activity is temperature-dependent, and measurements performed at controlled temperatures provide better consistency when comparing different samples or testing conditions.

The instrument is equipped with a graphical LCD display and a front-panel keypad for navigation, measurement control and data access. Its interface provides measurement information, sample temperature and water activity results. The photograph of this particular unit displays a reading of 0.2370 aw at a sample temperature of 25.14°C, demonstrating the instrument's measurement interface.

The AquaLab 4TE is designed for relatively rapid measurements, typically producing results in approximately five minutes, depending on sample characteristics and measurement conditions. This helps laboratories perform routine quality-control measurements without lengthy analytical procedures.

The system supports a variety of sample types, including powders, granules, liquids, semi-solids and solid materials, provided they can be accommodated in the sample cup and are suitable for the measurement method. A standard sample cup has a capacity of approximately 14–15 mL, with a smaller sample quantity generally recommended for routine testing.

The instrument also supports electronic data communication through USB and RS-232 interfaces, depending on the instrument version. Measurement records can be transferred to a computer for documentation, analysis and quality-control reporting. The original instrument documentation describes data storage and user-management capabilities for applicable configurations.

The AquaLab 4TE is widely applicable in food and beverage manufacturing, pharmaceutical research, biotechnology, agricultural science, chemical analysis and academic research. In food laboratories, it can be used to evaluate water activity in bakery products, dairy products, meat, confectionery, cereals, powders and dried foods. In pharmaceutical laboratories, it can support research involving moisture-sensitive raw materials, powders, granules and finished formulations.

In research and development facilities, the instrument helps scientists study moisture-related stability, product formulation, packaging requirements and storage behaviour. It is also useful in quality assurance laboratories where water activity is monitored as part of product release and manufacturing quality-control procedures.

The AquaLab 4TE combines chilled-mirror dew point sensing, controlled-temperature measurement, graphical display and computer connectivity in a compact benchtop design. It is a valuable analytical instrument for laboratories requiring accurate water activity measurements and reliable monitoring of moisture-related product characteristics.

Important: This product measures water activity (aw), not total moisture percentage directly. Moisture-content estimation requires an appropriate product-specific calibration or isotherm model.

2.1 Applications of Product

1. Food Quality Control: Measuring water activity in processed and packaged food products.

2. Pharmaceutical Research: Testing moisture-sensitive pharmaceutical powders, granules and formulations.

3. Shelf-Life Studies: Evaluating the relationship between water activity and product stability.

4. Microbial Stability Research: Assessing conditions associated with microbial growth.

5. Bakery Industry: Testing biscuits, bread, cakes and other baked products.

6. Dairy Industry: Water activity analysis of milk powders, cheese and dairy ingredients.

7. Meat and Seafood: Evaluating moisture-related product stability.

8. Confectionery Industry: Testing chocolates, candies and sugar-based products.

9. Agricultural Research: Measuring water activity in grains, seeds and agricultural materials.

10. Powder Analysis: Evaluating pharmaceutical, food and chemical powders.

11. Packaging Research: Studying moisture migration and product storage conditions.

12. Research and Development: Supporting formulation development and stability investigations.

13. Quality Assurance: Routine water activity measurement during manufacturing and product testing.

2.2 Product Features

• Chilled-mirror dew point measurement technology.

• Accurate water activity measurement.

• Measurement range of 0.0300–1.0000 aw.

• Water activity resolution of 0.0001 aw.

• Measurement accuracy of ±0.003 aw.

• Repeatability of approximately 0.001 aw.

• Integrated sample temperature control.

• Temperature range of 15°C to 50°C.

• Fast measurement, typically around five minutes.

• Graphical LCD display.

• User-friendly front-panel keypad.

• Sample cup capacity of approximately 14–15 mL.

• USB and RS-232 data communication interfaces.

• Suitable for powders, liquids and solid samples.

• Compact benchtop laboratory design.

• Suitable for food, pharmaceutical and industrial laboratories.

2.3 Technical Specifications

The following specifications are based on the AquaLab 4TE manufacturer's technical documentation.

Specifications are for the 4TE dew point configuration. Confirm the instrument's serial number, accessories and operating condition before sale.

2.4 Product Condition

Condition: To be confirmed.

• Brand New

• Refurbished

• Used