Pessl Metos Dualex User manual

Thank you for choosing our Dualex product. Our Dualex device is a hand-
tool leaf-clip combining the use of uorescence and a light transmission
of a leaf to determine its physiological state.
Additionally, this sensors is adapted to determine the avonol 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.
Dualex
USER MANUAL
Version 1.0, 09-2023
Pessl Instruments GmbH
Werksweg 107, 8160 Weiz, Austria
ofc[email protected]
[phone]
ENGLISH

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 the
main menu as shown below.
• Select Measurement and conrm with the OK button on the 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 le the device needs to be connected to
the PC using the USB cable. For more information, le denition 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 sufciently charged during eld activity
operations to avoid running into low battery and the device shutting
down.
• 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 content
• Flav: UV-absorbance
• Anth: Anthocyanins content
• NBI: Nitrogen Balance 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 classication 3 levels (le, 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
Updating Remote program updating
Pessl Instruments is continuously improving its products, technical
specications are subject to change without notice.

For full user manual please visit:
metos.at/manuals
Visit metos.at/terms-of-use/ to
view legal information for Pessl
Instruments products and services.
USER NOTES