Water Activity
Science
DA7200 for
Water Activity
New NIR
approach to fast
water activity
measurement.
DA7200 utilizes NIR
spectroscopy to determine
the activity of the water in
the sample.
D
A7200 measures water
activity by shining a
bright light on a sample
and collecting the reflected
spectrum of light. Reflected light
from a sample is characteristic of
the composition of that sample. In
other words, a sample with a
water activity of 0.300 will reflect
light differently than a sample
with a water activity of 0.320.
DA7200 measures this reflected
light and converts it to water
activity values using specialized
software. Since there is no
measurement of the air above the
sample, no equilibration time is
needed. In addition, because the
method of detection travels at the
speed of light along a fiber-optic
cable, the time for a water activity
measurement is almost
instantaneous.
DA7200 requires a product
specific calibration. Once
programed, the water activity of
your product is measured with
the touch of a button. No
equilibration necessary. Call Now.
DECAGON
DEVICES
950 NE Nelson Court
Pullman, Washington 99163
800-755-2751
fax 509/332-5158
[email protected]
www.aqualab.com
DA7200 Specifications
Water Activity Science
Accuracy
±0.02 aw
Reference
Ceramic Automatic
Range
0.100 to 1.000 aw
Internal Computer
1 GHz, 256 MB RAM, 20 GB
HDD
Rapid Analysis of
Water Activity
Operating Platform
Windows XP, Touch Screen
Easy Sample
Presentation
Wavelength Stability
< 0.2 nm/year
Communication Ports
2 x USB, 1 x Parallel, 1 x LAN,
1 x Keybord, 1 x Mouse, 1 x
External Monitor
Non-Contact and
Non-Destructive
Analysis
Resolution
3.125 nm/diode
Power Requirement
115/230 V, 50/60 Hz, 115 W
Non-Moving Optics.
Detector
T.E. cooled 256 elements InGaAs.
Internal Line Source Reference
Humidity
35 – 80 % non condensing
Wavelength Range
950 – 1650 nm
Wavelength Accuracy
< 0.3 nm
Data/Spectral
Collection Rate
Approx. 100 spectra/second
Noise
< 0.00006 AU over 3s measuring
time
Optics
F/3
Dimensions (HxDxW)
556x375x370 mm with Touch
Screen in upright position
Net Weight
21 kg
Sample Presentation
Non-contact, down view, rotating
sample dish
SAMPLE MEASURING AREA
Ambient Temperature
5 – 35 °C
Grating
Gold-coated ruled stationary
grating
Lamp lifetime
Approx. 5000 hrs, operator
exchangeable
Large sample cup
Ø 140 mm. Area: 154 cm2
(measured 108 cm2)
Small sample cup
Ø 75 mm. Area 44 cm2
(measured 44 cm2)
DECAGON
DEVICES
950 NE Nelson Court
Pullman, Washington 99163
800-755-2751
©2005 Decagon Devices, Inc.
Printed in USA.
fax 509/332-5158
[email protected]
www.aqualab.com