PiCUS TreeQinetic

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The PiCUS TreeQinetic measuring system is used to perform tensile tests on trees. Tensile tests serve as part of detailed tree examinations to determine the break resistance and stability by measuring the tree’s reaction to an artificial wind substitute load.

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    PiCUS TreeQinetic Description

    The tensile test with the PiCUS TreeQinetic provides you with all the measurement data you need to determine the root condition and the resistance to trunk breakage. During the tensile test, the tree is exposed to a defined equivalent wind load. The PiCUS TreeQinetic records three measured variables at the same time:

    • Applied force
    • Stretching or compression of the wood fibers
    • Root plate inclination

    To do this, the tree is pulled with a rope attached to the crown and with the help of a wrench. The load generated in this way and the reaction of the tree are measured with the Forcemeter, Inclinometer and Elastometer of the PiCUS TreeQinetic.

    In this way, it is possible to determine how a tree behaves under load with a single measurement setup.

    The various sensors of the PiCUS TreeQinetic

    The inclinometer and elastometer sensor elements record the tree’s reaction to the load in different ways. The new Elastometer 3i can combine both technologies.


    The TreeQinetic inclinometers measure the inclination of the root plate and trunk under the tensile load. This can be used to evaluate the root stability and the anchoring force of the tree in the ground.


    The elastometers record the elongation or compression of the outer wood fibers of the trunk. The measured values ​​serve as a basis for estimating the break resistance.

    Elastometer 3i

    In addition to the expansion or compression of the edge fibers, the new 3i elastometers can also measure the angle of the tree at its position and thus the inclination. The bending line and curvature of the tree can be calculated from the angle measurements at several positions. The bending line can, for example, help to better assess knot wounds.

    PiCUS TreeQinetic range of functions:

    Range: Action radius up to 60 m
    Accuracy: Elastometer: 0.1 µm; Inclinometer: 0.005 °; Forcemeter: 0.3 kN
    Connection: Wireless data transfer of all measurement data to the PC
    Force build-up: A mechanical gripper pull with steel cable to build up the tensile force is optionally available in two variants
    Expansion: The system can be upgraded with additional sensors at any time

    Scope of delivery

    Standard scope of delivery:

    • Transport case
    • Radio control center
    • Forcemeter V2
    • Inclinometer 0.002 °
    • Inclinometer magnetic mount
    • Elastometer
    • 10x elastometer needles
    • Elastometer nail gauge
    • charger
    • IEC cable
    • 3x charging cables 0.45 m
    • USB data cable
    • 2x data cable 5 m
    • Forcemeter data cable 30 m
    • USB stick with software
    • Overload indicator (with magnetic holder)
    • 2x anchor lockers (welded form Tf. 6700 kg, with screw bolts)
    • Rivet pliers (for removing the elastometer needles)
    • Bluetooth 5.1 USB radio stick

    Measuring principle

    The measuring principle:

    During the tensile test, the tree is loaded by means of a rope that is attached to the crown and is pulled with a winch. The reaction of the tree to this load and the load itself are recorded: The TreeQinetic Forcemeter measures the force in the rope strand, while the TreeQinetic Elastometer measures the elongation or compression of the edge fibers of the trunk and the TreeQinetic Inclinometer measures the inclination of the root plate. These measured values are displayed live by the TreeQinetic software and saved after the test. For further evaluation, these values can be processed using additional software (arbostat, http://www.arbosafe.com). By comparing the tree reaction to a known equivalent load with the calculated load of an expected storm, a safety factor for breakage and stability is calculated.

    Technical details

    Technical details

    TreeQinetic Elastometer and Elastometer 3i

    The elastometers measure the compression or elongation of the edge fibers of the trunk. These TreeQinetic Elastometers 3i measure not only the outer fiber strain but also the current angle of the tree at their mounting position. The bending line and curvature of the tree can be calculated from the angle measurement values.

    Resolution 0.1 µm
    Accuracy 1 µm
    Measuring range +/- 2 mm
    Battery life ~ 20 h at 20 ° C (wireless operation)
    Distance between measuring tips 198 – 202 mm
    Diameter measuring tips 2 – 4 mm

    TreeQinetic Forcemeter

    The TreeQinetic Forcemeter measures the force that is coupled into the tree via the rope during the tensile test. For improved handling, a protractor is integrated that records the rope angle while pulling.

    Resolution: 0.01 kN
    Accuracy: 0.3 kN
    Measuring range: 0 – 40 kN
    Battery life: ~ 15 h at 20 ° C (wireless operation)

    TreeQinetic Inclinometer

    The TreeQinetic Inclinometers measure the inclination of the tree (root plate and trunk).

    Resolution: 0.002 °
    Accuracy: 0.005 °
    Measuring range: +/- 15 °
    Battery life: ~ 20 h at 20 ° C (wireless operation)
    Maximum distance of the radio transmission: 3 to 30 meters


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