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General| Model | AQUALAB |
|---|---|
| Accuracy (aw) | ±0.003 aw |
| Measurement Time | 5 minutes |
| Measurement Range (aw) | 0.03 to 1.00 aw |
| Temperature Range | 5°C to 50°C |
| Power Supply | 110-220 VAC, 50/60 Hz |
Defines the relationship between water activity and moisture content, crucial for product quality and safety.
Explains the DDI and DVS methods used by the VSA for dynamic and static isotherms.
Details the technical specifications for water activity, temperature, dimensions, and compliance.
Describes the instrument's interface, including tabs like Isotherm, Measurement, Configuration, and Data.
Provides access to various settings like calibration, date, time, regional formatting, and admin settings.
Enables viewing, graphing, and deleting stored test data.
Highlights the VSA's unique capability to generate both dynamic (DDI) and equilibrium (DVS) isotherms.
Explains hysteresis, the phenomenon where water content differs during adsorption and desorption.
Discusses how slow diffusion can lead to apparent hysteresis, affecting measurement accuracy.
Explains how physical changes in a sample matrix can affect isotherm results and apparent hysteresis.
Describes generating working isotherms to analyze sorption characteristics from a sample's native state.
Introduces common models like BET and GAB used to predict moisture content and thermodynamic functions.
Details applications like process control, moisture content prediction, temperature effects, and shelf life.
Selecting a location, leveling the instrument, and initial physical setup procedures.
Connecting power, installing desiccant tubes, air cylinder, and weighing pan.
Verifying scale stability and filling the water tank for operation.
Steps to install the software and connect the instrument to a computer.
Instructions on how to replace the desiccant material when it exhausts its drying capacity.
Detailed procedure for cleaning the sample chamber, mirror, and sensors to maintain accuracy.
Lists the supplies included in the AQUALAB Cleaning Kit for instrument maintenance.
Step-by-step guide for washing, rinsing, and drying components for thorough cleaning.
Instructions for replacing the capacitance filter if it becomes contaminated.
Overview of available maintenance and calibration service packages offered by METER.
Importance and procedure for verifying water activity calibration against standards.
Lists the available verification standards and their corresponding water activity levels.
Steps to perform calibration verification and check for linear offset.
Procedure for adjusting the linear offset to correct for minor calibration drifts.
Steps to adjust the balance offset for accurate weight measurements.
Instructions to restore original calibration settings to factory defaults.
Performing a comparison of generated isotherms against a standard for accuracy checks.
Understanding test stages and how they contribute to an overall isotherm test.
Using the software for interfacing, data download, viewing, and test setup.
General procedure for setting up and running a moisture sorption isotherm test.
Specific DDI test parameters for investigating glass transition events.
Steps to generate both adsorption and desorption curves for a working isotherm.
How to edit a running test by adding or modifying stages.
Using the VSA as a water activity meter, including settings for capacitance or dew point sensors.
Special considerations for preparing samples with coatings or that equilibrate slowly.
Techniques for samples that emit water slowly, suggesting DVS over DDI.
How to handle volatile samples that can affect sensor readings.
Handling samples with water activity below the instrument's detection limits.
Lists common problems and their solutions for instrument issues.
Contact information for customer service and technical support in North America and Europe.
Procedures and warranty information for instrument repairs and returning units.
Agreement to METER Group's terms and conditions when using instruments.
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