1
1. INTRODUCTION
Thank you for choosing the AQUALAB
®
TDL Water Activity Meter from METER Group, Inc. USA.
AQUALAB is the most accurate and most reliable instrument available for measuring water
activity (
a
w
).
This manual includes instructions for the AQUALAB TDL and AQUALAB TDL 2. For simplicity,
both will be referred to as "AQUALAB TDL" and all instructions in this manual apply to both
instruments: setting up the instrument, verifying its calibration, preparing samples, and
taking readings as well as instructions on proper care, maintenance, and cleaning. Contact
with any questions about your TDL.
Verify all of the listed instrument contents shipped and appear in good condition:
• AQUALAB TDL Water Activity Meter
• Calibration certificate
• Power cord
• USB A to B cable
• 250 disposable sample cups
• AQUALAB Cleaning Kit
• Two vials each of the following verification standards solutions:
1.00
a
w
Pure Steam Distilled H
2
O
0.984
a
w
0.50 mol/kg KCl
0.920
a
w
2.33 mol/kg NaCl
0.760
a
w
6.00 mol/kg NaCl
0.500
a
w
8.57 mol/kg LiCl
0.250
a
w
13.41 mol/kg LiCl
