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Aqua Lab Series 3 User Manual

Aqua Lab Series 3
105 pages
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Water Activity Meter
Operator’s Manual
Version 6
for AquaLab Series 3
Decagon Devices, Inc.

Table of Contents

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Aqua Lab Series 3 Specifications

General IconGeneral
BrandAqua Lab
ModelSeries 3
CategoryMeasuring Instruments
LanguageEnglish

Summary

1. Introduction

About this Manual

Instructions for setting up, verifying, preparing samples, and maintaining the instrument.

Customer Support

Contact information and methods for obtaining assistance with the AquaLab.

Warranty

Details the 30-day satisfaction guarantee and three-year warranty on parts and labor.

Seller’s Liability

Outlines the seller's responsibilities and limitations regarding equipment warranty and use.

2. About AquaLab

AquaLab 3 Instrument Specifications

Lists technical specifications like range, accuracy, resolution, and operating environment.

AquaLab and Water Activity

Explains water activity as an energy status measure and its importance in products.

How AquaLab works

Details the chilled-mirror dew point technique used by the AquaLab for measurement.

AquaLab and Temperature

Discusses the instrument's temperature handling and its effect on readings.

Limitations

Describes the instrument's limitations, particularly with volatile samples.

3. Water Activity Theory

Moisture content

Explains moisture content and its limitations compared to water activity.

Water activity

Defines water activity as an energy status measure and its relation to perishability.

Temperature Effects

Details how temperature influences water activity measurements and potential errors.

Water Potential

Explains water potential and its relationship to water activity.

Factors in Determining Water Potential

Discusses osmotic, matric, and pressure effects influencing water potential.

Sorption Isotherms

Explains the relationship between water activity and water content.

4. Getting Started

Components of your AquaLab

Lists all items included with the AquaLab shipment.

Choosing a Location

Provides guidance on selecting a suitable environment for instrument operation.

Features

Highlights the key physical features and interfaces of the AquaLab unit.

Preparing AquaLab for Operation

Outlines the initial steps for setting up and powering on the instrument.

5. The Menus

The Measurement Screen

Describes the main display showing water activity and sample temperature.

Changing Languages

Explains how to select a different on-screen user language.

Normal Sampling Mode

Details the default measurement mode and its completion notification.

Continuous Mode

Describes the mode for continuous sample readings and toggling.

Temperature Equilibration Screen

Shows how to view sample-to-chamber temperature differences.

System Configuration

Covers minor system adjustments, including audible alarms.

6. Cleaning and Maintenance

Cleaning the Block and Sensors

Provides instructions for accessing and cleaning internal components.

Cleaning Procedure

Details the step-by-step process for cleaning the sample chamber and mirror.

Checking Calibration

Explains how to verify instrument performance after cleaning.

7. Verification and Calibration

Water Activity Verification

Explains the importance and process of verifying calibration.

Calibration Standards

Introduces the prepared salt solutions used for calibration.

Calibration

Details the procedure for verifying and adjusting linear offset.

8. Sample Preparation

Preparing the Sample

Provides steps for preparing samples for accurate measurement.

Samples Needing Special Preparation

Discusses samples that require extra preparation for accurate readings.

Coated and Dried Samples

Addresses specific preparation needs for coated and dried food products.

Slow Water-Emitting Samples

Explains how to handle samples that release moisture slowly.

Volatile Samples

Discusses potential issues and solutions for samples containing volatile compounds.

Low Water Activity

Covers measurement of samples with very low water activity.

Samples not at Room Temperature

Discusses how temperature differences affect sample measurement.

9. Taking a Reading

Measurement Steps

Outlines the sequential steps for performing a measurement.

How AquaLab takes Readings

Explains the internal process the AquaLab uses to determine readings.

Cautions

Provides important warnings related to sample handling and instrument movement.

10. Computer Interface

AquaLink Software

Describes the optional software for data collection and graphing.

Using Windows Hyperterminal

Provides instructions for using Hyperterminal for data transfer.

11. Troubleshooting

Troubleshooting Quick Guide

A quick reference table for common problems and their solutions.

PROBLEM #1: AquaLab won’t turn on

Solutions for the instrument failing to power on.

PROBLEM #2: Readings are slow or inconsistent

Solutions for slow or inconsistent measurement readings.

PROBLEM #3: Calibration standards readings too high/low

Solutions for calibration issues where linear offset is maxed out.

PROBLEM #4: Screen displays “Sample too hot”

Addresses the "Sample too hot" error message and its cause.

PROBLEM #5: Screen displays “<“ symbol

Explains the "<" symbol error for dry samples.

PROBLEM #6: Screen displays “aw > 1.0”

Solutions for the "aw > 1.0" error, indicating a cooler issue.

PROBLEM #7: Verification is not correct

Solutions when calibration verification fails.

PROBLEM #8: Triangle appears in upper right corner

Explains the meaning of the triangle warning symbol.

PROBLEM #9: Screen displays “Block failure”

Solutions for the "block failure" screen error.

Component Performance Screen

How to access a screen showing component performance values.

12. Support and Repair

Shipping Directions

Instructions for safely packaging and shipping the instrument.

Repair Costs

Information on warranty repairs and non-warranty charges.

Loaner Service

Details about obtaining a loaner instrument during servicing.

13. Further Reading

Water Activity Theory & Measurement

References related to water activity theory and measurement techniques.

Food Quality and Safety

References related to water activity's impact on food quality and safety.

Water Activity and Microbiology

References on water activity's role in microbial growth and control.

Water Activity in Foods

References specific to water activity in various food types.

Pharmaceuticals/Cosmetics

References concerning water activity in pharmaceutical and cosmetic applications.

Miscellaneous

A collection of references on various topics related to water activity.

Appendix A

Preparing Salt Solution

Instructions for mixing saturated salt solutions for calibration.

Appendix B

Table 2: Temperature Correction of Decagon’s Calibration Standards

Table showing temperature corrections for calibration standards.

Declaration of Conformity

Application of Council Directive

Lists the relevant EU directives for conformity.

Standards to which conformity is declared

Specifies the standards the equipment complies with.

Manufacturer’s Name

Identifies the manufacturer and their location.

Type of Equipment

States the type of equipment covered by the declaration.

Model Number

Specifies the model number of the equipment.

Year of First Manufacture

Indicates when the equipment model was first manufactured.

Certificate of Traceability

Decagon Devices, Inc.

Company contact details for traceability information.

National Institute of Standards and Technology (NIST)

States calibration traceability to NIST standards.

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