Pessl Instruments DUALEX Fiche d'information produit

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

ofﬁc[email protected]

+43 317 255 21

Visit metos.at/terms-of-use/ to view

legal information for Pessl Instruments

products and services.

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