Why does AquaLab 4TE Measuring Instruments display no moisture content reading?
This message on your AquaLab Measuring Instruments means the water activity or temperature for that reading is beyond the scope of the moisture sorption isotherm. Ensure that the sample water activity and the instrument controlling temperature are within the scope of the selected moisture sorption isotherm model.
General| Accuracy | ±0.003 aw |
|---|---|
| Temperature Control | 15 to 50 °C |
| Measurement Time | 5 minutes |
| Measurement Principle | Chilled Mirror Dewpoint |
| Resolution | 0.0001 aw |
| Temperature Accuracy | ±0.1 °C |
| Communication | USB, RS-232 |
| Display | LCD |
| Measurement Range | 0.03 to 1.00 aw |
| Operating Temperature | 4-50 °C (39-122 °F) |
| Data Storage | 8000 readings |
| Power Supply | 50/60 Hz |
| Storage Temperature | -20 to 50 °C |
Contact information and support channels for assistance with your AquaLab instrument.
Overview of the manual's content, covering setup, calibration, sample preparation, and maintenance.
Details the 30-day satisfaction guarantee and one-year warranty on parts and labor for the AquaLab.
Defines the seller's warranty against defects and limitations of liability for the AquaLab.
Technical specifications for the AquaLab 4 water activity meter, including range, accuracy, and dimensions.
Technical specifications for the AquaLab 4 DUO, focusing on moisture content repeatability and accuracy.
Describes the different AquaLab series (4, 4TE, 4TEV, DUO) and their features.
Explains the chilled-mirror dew point technique and capacitance sensor operation in AquaLab.
Discusses the importance of temperature control for accurate water activity measurements.
Details limitations of the chilled mirror dew point sensor, especially with volatile samples.
Explains moisture content determination methods and its limitations as a predictor.
Defines water activity as an energy status measure and its relation to perishability.
Describes how temperature differences can affect water activity measurement accuracy.
Explains water potential as a thermodynamic property related to water activity.
Discusses the relationship between water activity and water content, and sorption isotherms.
Lists all items included in the AquaLab shipment, including the meter and verification solutions.
Guidance on selecting an optimal location for the AquaLab to ensure correct and consistent operation.
Steps for setting up the AquaLab, including plugging it in and initial warm-up.
Description of the main measurement screen displaying water activity and sample temperature.
Navigating the configuration menu to adjust settings like calibration, temperature, and sensor.
Managing administrator passwords, user setup, auto-save, beeps, and contrast settings.
Options for viewing, deleting, and managing stored measurement data.
Procedure for accessing and cleaning the sample chamber and its sensors.
Specific cleaning instructions for Series 4TEV, including capacitance sensor care.
Detailed multi-step procedure for washing, rinsing, and drying components.
Checking instrument performance after cleaning to correct for linear offset.
Importance and methods for verifying AquaLab calibration using known standards.
Details on using prepared unsaturated salt solutions for accurate verification.
Step-by-step guide to verify calibration and check for linear offset.
Procedure to adjust the linear offset of the instrument based on verification standards.
Guidelines for preparing samples, including homogeneity, filling, and consistency.
Addressing samples that require extra preparation for accurate readings, like coated or dried items.
Tips for measuring samples that release water slowly, requiring continuous or custom mode.
Measuring volatile samples using the capacitance sensor and potential interference issues.
Handling samples with water activity below the instrument's detection limits.
Guidelines for measuring samples that are significantly colder or warmer than the instrument.
Step-by-step instructions for performing a water activity measurement.
Explanation of the AquaLab's reading cycle and how it determines equilibrium.
Information on generating and obtaining product-specific isotherm models for moisture content calculation.
How to load and manage product models using the AquaLink 4 software.
Steps for measuring moisture content simultaneously with water activity using DUO models.
Adjusting moisture content calculations to correlate with reference methods.
Procedure for adjusting linear offset or creating new moisture content models.
Restoring original moisture content model settings to factory defaults.
Steps for deleting product models from the instrument.
Description of AquaLink 4 software for data collection, report generation, and instrument management.
Information on AquaLink 4 software compliant with CFR Part 11 regulations.
Instructions for connecting AquaLab to a computer using terminal programs and required settings.
Troubleshooting steps for when the AquaLab instrument fails to power on.
Solutions for slow or inconsistent readings, including chamber cleanliness and temperature.
Troubleshooting high/low verification readings and issues with linear offset adjustment.
Addresses the 'Sample too hot' warning and provides solutions for temperature-related issues.
Troubleshooting messages indicating sample water activity is below detection limits.
Diagnosing and resolving dew point sensor failure errors, often requiring service.
Steps for resolving firmware corruption errors, which may require instrument servicing.
Troubleshooting incorrect verification results, including cleaning and linear offset adjustments.
Solutions for 'Contaminated mirror' errors, emphasizing mirror cleaning.
Correcting errors when a test is run with an incorrect product model on the DUO.
Troubleshooting incorrect moisture content display on DUO models.
Resolving issues where moisture content is not displayed on the DUO screen.
Addressing incorrect moisture content readings on DUO models, likely due to model selection or calibration.
Information on warranty repairs and charges for non-warranty services.
Details on Decagon's loaner instrument service while your AquaLab is being serviced.
Instructions for mixing saturated salt solutions for use as verification standards.
Table showing water activity values of selected salt solutions at various temperatures.
Benefits of using pre-packaged standard salt solutions for AquaLab verification.
Discussion on the limitations and uncertainties associated with saturated salt solutions.
Explanation of why unsaturated salt solutions are superior verification standards.
Step-by-step guide for using Decagon's verification standards with the AquaLab.
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