Decagon Devices AquaLab 4TE Manuale utente

AquaLab

Water Activity Meter

Operator’s Manual

For Series 4TE, 4TEV, DUO

Version 4

Decagon Devices, Inc.

Decagon Devices, Inc

2365 NE Hopkins Court

Pullman WA 99163

(509)332-2756

fax: (509)332-5158

www.aqualab.com

[email protected]

Trademarks

AquaLab is a registered trademark of

Decagon Devices, Inc.

Contents

1. Introduction .................................1

About this Manual ....................................1

Customer Support .....................................1

Warranty ...................................................2

Seller’s Liability..........................................2

2. About AquaLab ...........................4

AquaLab Model and Options ....................4

AquaLab 4 Instrument Speciﬁcations ........4

AquaLab 4 DUO Speciﬁcations.................5

How AquaLab Works ................................6

AquaLab and Temperature ........................6

Chilled Mirror Dewpoint Limitations .......8

3. Water Activity eory...................9

Moisture Content ......................................9

Water Activity............................................9

Water Potential ........................................12

Sorption Isotherms ..................................13

4. Getting Started........................... 15

Components of your AquaLab................. 15

Choosing a Location ............................... 15

Preparing AquaLab for Operation............16

5. Menus ......................................... 18

Measurement Tab ....................................18

Conﬁguration Tab................................... 19

Admin Settings........................................25

Data Tab .................................................30

6. Cleaning and Maintenance........32

Cleaning the Block and Sensors...............33

Cleaning Procedure: ...............................34

Veriﬁcation of Calibration .......................36

7. Veriﬁcation and Calibration........37

Water Activity Veriﬁcation.......................37

Veriﬁcation of Calibration .......................38

8. Sample Preparation ....................46

Preparing the Sample...............................46

Samples Needing Special Preparation ......47

Slow Water-Emitting Samples..................48

Volatile Samples.......................................49

Low Water Activity..................................49

Samples not at Room Temperature ..........50

9. Taking a Reading ....................... 51

Measurement Steps..................................51

How AquaLab Takes Readings ................51

10. Duo Operation (Optional).......54

Obtaining Product Isotherm Models .......55

Loading and Organizing Product Models 55

11. Computer Interface...................60

AquaLink RG..........................................60

Using Windows Hyperterminal .............60

iii

12. Troubleshooting .......................62

Diagnostic Screen ....................................72

13. Support and Repair ..................73

Repair Costs ............................................74

Loaner Service .........................................74

14. Further Reading .......................75

Water Activity eory & Measurement ...75

Food Quality and Safety..........................78

Water Activity and Microbiology.............80

Water Activity in Foods ...........................83

Appendix A.....................................93

Preparing Salt Solution ............................93

Appendix B.....................................95

Temperature Correction ..........................95

Appendix C.....................................96

AquaLab Calibration Standards ..............96

Declaration of Conformity ........... 101

Certiﬁcate of Traceability............. 102

AquaLab

1. Introduction

1. In t r o d u c t I o n

Welcome to Decagon’s AquaLab Series 4TE, 4TEV, and DUO, the

industry standard for measuring water activity (aw). AquaLab is the

quickest, most accurate, and most reliable instrument available for

measuring water activity. Whether you are researching or working

on the production line, AquaLab will suit your needs. It is easy to

use and provides accurate and timely results.

About this Manual

Included in this manual are instructions for setting up your AquaLab,

verifying the calibration of the instrument, preparing samples, and

maintaining and caring for your instrument. Please read these in-

structions before operating AquaLab to ensure that the instrument

performs to its full potential.

Customer Support

If you ever need assistance with your AquaLab, or if you just have

questions or feedback, there are several ways to contact us:

NOTE: If you purchased your AquaLab through a distributor, please

contact them for assistance.

E-mail

[email protected]

Please include your name, contact information, instrument serial

number(s), and a description of your problem or question.

[email protected]

Please include your name, address, phone number, the items you

wish to order and a purchase order number. Credit card numbers

should always be called in.

AquaLab

1. Introduction

Phone

1-800-755-2751 (USA and Canada Only)

1-509-332-2756 International

Our Customer Support and Sales Representatives are available

Monday thru Friday.

Fax

1-509-332-5158

Warranty

AquaLab has a 30-day satisfaction guarantee and a three-year war-

ranty on parts and labor. Your warranty is automatically validated

upon receipt of the instrument. We will contact you within the ﬁrst

90 days of your purchase to see how the AquaLab is working for

you.

Seller’s Liability

Seller warrants new equipment of its own manufacture against de-

fective workmanship and materials for a period of three years from

date of receipt of equipment (the results of ordinary wear and tear,

neglect, misuse, accident and excessive deterioration due to corro-

sion from any cause are not to be considered a defect); but Seller’s

liability for defective parts shall in no event exceed the furnishing

of replacement parts Freight On Board the factory where originally

manufactured. Material and equipment covered hereby which is

not manufactured by Seller shall be covered only by the warranty

of its manufacturer. Seller shall not be liable to Buyer for loss, dam-

AquaLab

1. Introduction

age or injuries to persons (including death), or to property or things

of whatsoever kind (including, but not without limitation, loss of

anticipated proﬁts), occasioned by or arising out of the installation,

operation, use, misuse, nonuse, repair, or replacement of said ma-

terial and equipment, or out of the use of any method or process

for which the same may be employed. e use of this equipment

constitutes Buyer’s acceptance of the terms set forth in this warranty.

ere are no understandings, representations, or warranties of any

kind, express, implied, statutory or otherwise (including, but with-

out limitation, the implied warranties of merchantability and ﬁtness

for a particular purpose), not expressly set forth herein.

AquaLab

2. About AquaLab

AquaLab is the fastest and most accurate instrument for measuring

water activity, giving readings in ﬁve minutes or less. Its readings

are reliable, providing ±0.003 awaccuracy. e instrument is easy

to clean and checking calibration is simple.

AquaLab Model and Options

Series 4TE: User-selectable internal temperature control model,

uses thermoelectric (Peltier) components to maintain internal tem-

perature.

Series 4TEV: Uses both a chilled-mirror dewpoint sensor and a ca-

pacitance sensor for measuring non-volatile and volatile substances,

respectively. Either sensor is easily selected using the instrument’s

menu system.

Series 4TE DUO: Uses chilled-mirror dewpoint and programmed

models obtained from isotherm data to give the user both water ac-

tivity and moisture content simultaneously in ﬁve minutes or less.

AquaLab 4 Instrument Speciﬁcations

Water Activity Range: 0.050 to 1.000 aw

Water Activity Accuracy: ±0.003 (4TE Dew Point Mode)

Water Activity Accuracy: ±0.015 (4TEV Capacitance Mode)

Water Activity Resolution: 0.0001

Read Time1:≤5 min.

Sample Temperature Range: 15 to 50° C

Sample Temperature Accuracy: ±0.2° C

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