Pessl Instruments DUALEX Product information sheet
DUALEX by Pessl Instruments
SHORT USER MANUAL
Thank you for choosing our Dualex product. Our Dualex device is a
hand-tool leaf-clip combining the use of fluorescence and a light
transmission of a leaf to determine its physiological state.
Additionally, this sensors is adapted to determine the flavonol content
of the leaf by measuring the optical absorbance of the epidermis in the
ultraviolet (UV) optical range through the differential measurement of
the chlorophyll content of the leaf by using different wavelengths in
the RED and in the NIR.
The Dualex device will be mainly used for:
The measurement of the leaf chlorophyll content (CHL), the epidural
UV-absorbance (Flav), and anthocyanins content(Anth) as well as the
Nitrogen Balance Index (NBI) which is the ratio of CHL and Flav.
This information contain valuable indicators used in many applications
such as:
●nitrogen fertilisation
●leaf ripeness
●plant senescence
●plant protection against UV radiation
●pathogen susceptibility
●variety selection
YOUR DUALEX
The Dualex is delivered in a case which consists of the Dualex device
leaf-clip, a USB Cable and a user manual. The Dualex device operates
on an internal rechargeable battery.
START-UP THE DUALEX
Unpack the Dualex device and check whether there is no evidence of
any physical damage. In case of any damage, please contact Pessl
Instruments as soon as possible. The device is charged before delivery.
However, depending on storage time and delivery period, the battery
may be discharged, hence the need to recharge.
This can be done using the USB Cable directly from the computer or
using any compatible wall plug adapter.
TAKING A MEASUREMENT
To start using your Dualex device, press the power button. A beep and
a welcome screen with the Pessl Logo displays shortly and then is the
main menu as shown below.
●Select Measurement and confirm with the OK button on
keyboard
●Make sure there is no leaf inside the clips and press OK
again (when prompted to remove leaf and press OK). You will
be greeted with the main measurement screen as shown
below.
●Open the clip and introduce the intended leaf to measure
between the 2 heads to take a measurement
●After the measurement is complete results will be displayed
on the screen.
GET YOUR MEASURED VALUES
Measured values can be read from the screen on the Dualex device
and the stored measurements can be obtained from the internal
storage.
To access the measurement file the device needs to be connected to
the PC using the USB cable. For more information, file definition and
value description please refer to our standard Dualex user manual
available at https://metos.at/en/manuals/ .
MAINTAINING THE DUALEX
●Make sure the optics are always clean and free from all sorts
of dirt at all times
●Ensure that the batteries are sufficiently charged during field
activity operations to avoid running into low battery and the
device shutting down. As portable power bank can serve as a
backup
●Device should be used only for its intended purpose
Cleaning and maintenance:
During every return in the laboratory, the Dualex should be cleaned by
using a tissue slightly moistened with a mixture of water and alcohol.
The optical parts of the device must be carefully cleaned by blowing
clean and dry air, and then with a cotton swab slightly moistened with
ethanol.
TECHNICAL SPECIFICATIONS
Measured material
Leaf
Measured parameters
4 measured indices:
Chl: chlorophyll index Flav: flavonol index
NBI: nitrogen status, Chl/Flav ratio Anth:
anthocyanin index
Measurement process
Automatic or manual
Measured area
5 mm in diameter
Sample thickness
1 mm maximum
Measurement area
access
8.5 cm maximum (half-leaf width)
Acquisition time
< 500 ms
Storage capacity
10,000 multiparametric measurements
Data classification
3 levels (file, group, and measurement
numbers)
Temperature range
From 5 to 45°C
Light sources
5 LED 1 UV-A, 1 green, 1 red and 2 NIR
(near-infrared)
Detectors
1 silicon photodiode
User interface
LCD screen
Sound warning
Data downloading
USB connection for data transfer
Battery
Li-ion rechargeable battery
Battery life
10 hours
Charge time
4 hours
Total weight
220 g (with battery)
Size
205 mm x 65 mm x 55 mm
Positioning
Internal GPS
Relative accuracy
< 2.5 m (CEP, 50%, 24 static)
Languages
English, French, Spanish, German
Safety
Ring for leash
*Warning: as Pessl Instruments is continuously improving its products, technical specifications are
subject to change without notice.
User notes:
Pessl Instruments GmbH
Werksweg 107, 8160 Weiz, Austria
+43 317 255 21
Visit metos.at/terms-of-use/ to view
legal information for Pessl Instruments
products and services.
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