Overview

    The DV dendrometer is used for high-precision and continuous measurement of vertical changes in dimension and/or curvature of tree stems. This device is suitable for long-term in outdoor conditions. Due to their extremely low power consumption, Ecomatik dendrometers are ideal for battery-powered solutions, e.g., in IoT applications.

    The DV dendrometer is designed to continuously measure vertical changes (not growth) of trees. Tree stems and their respective sections vary in length and curvature, according to water status (short- to mid-term), wind direction and wind speed (short-term to permanent), snow and fruit load (mid-term to permanent), and unbalanced growth or loss of crown parts (long-term to permanent). Transcription of vertical changes, along with their directional information, provides valuable information to assess water status and static properties of a tree (stress-strain relationship, mechanical load/stability, etc.). Parallel measurements with three vertical dendrometers (each oriented in three different cardinal directions) are necessary for a complete overview of vertical changes.

    Advantages

    • Stress-strain relationship computation
    • Maximum stability against wind, snow, falling branches and fruit
    • Ideal for long-term measurements

    Limits

    • Installation (drilling and screwing in the anchoring screws) damages the tree trunk (which could be minimized with wound closure resin).
    • Only suitable for diameters > 8 cm

    Models

    Models

    Suitable for diameter

    Measurement range

    DV> 8 cm11 mm

    Technical data

    Sensor model name

    Vertical Dendrometer
    Type DV

    Scope of application

    Slow/average growth rates

    Suitable for diameter

    Stem diameter > 5 cm

    Special features/limitations

    For measuring vertical stem displacement (water status, structural stability and bending behaviour under loads, e.g. wind or snow load).

    Measurement range

    11 mm linear

    Resolution

    Data logger dependent e.g.:
    CR300 series: 0.01 µm
    Dendrometer logger DL18: 0.2 µm

    Accuracy

    Dendrometer dependent: max. ± 4.5% of the measured value (stable offset)
    Data logger dependent e.g.:
    CR300 series: ± (0.04% of the measured value +0.3 µm)
    Dendrometer logger DL18: ± (0.1% of the measured value +0.45 µm)

    Output signal

    Analog: 0 V to Vex (supply voltage)

    Digital, SDI-12: Output in µm

    Data logging

    Flexible options for data logging & transmission:

    1. Data logger, manual readout (analog or SDI-12, e.g. DL18 or CR350)
    2. LoRaWAN, wireless data transmission (analog, e.g. IoP-S-LA)
    3. NB-IoT (analog, e.g. IoP-S-NA, IoP-S-LTEMA)

    Temperature drift of the sensor

    <0.2 µm/°C in the whole measurement range

    Linearity

    <1%

    Operational conditions

    Normal outdoor field conditions, -25 to 70 °C, 0 to 100% relative air humidity; not suitable for underwater use or installation below snow cover.

    Weight (sensor without cable)

    13 g

    Power supply

    Vex (! stabilized !) 0.5 to 10 VDC,
    Power consumption max. 0.28 µWh per measurement

    Material

    Stainless steel and aluminium

    Sensor cable length

    5 m, extendable on request to max. 100 m

    Manuals

    DV

    DV(216.1 kB)

    Technical data sheets

    DV

    DV(97.9 kB)

    Special information for integrators & developers

    Dendrometer to datalogger

    Dendrometer to datalogger(94.8 kB)

    Dendrometer cable wire assignment

    Dendrometer cable wire assignment(123.1 kB)

    Dendrometer temperature sensitivity test

    Dendrometer temperature sensitivity test(540.4 kB)

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    Accessories & Compatible Products

    Data logging

    From small and compact solutions to fully developed measurement networks, Ecomatik offers turnkey system solutions for sensor data acquisition in any required size:

    • IoP systems (Internet of Plants) for wireless sensor data acquisition at freely positionable measurement points. Customer-specific preconfigured plug-and-play systems with online data visualization and data transmission via NB-IoT/LTE-M or LoRaWAN.
       
    • Mini systems with compact 4-channel data logger (DL18 and DL18-BLE) for flexible long-term measurements under field conditions. Compact and robust systems for connecting various sensors and decentralized measurement points.
       
    • Maxi systems for customer-specific system integration and individual measurement installations. From planning to implementation of complex measurement networks including sensors, power supply, and data transmission.
       
    • SDI-12 converter for analog signals for converting analog sensor signals into digital SDI-12 data. Enables the integration of ECOMATIK sensors into measurement systems without suitable analog inputs.

    Note

    The output signal of all Ecomatik dendrometers is an analog DC voltage. In addition, digital SDI-12 interfaces are available depending on the sensor model. Our dendrometers are therefore compatible with almost all common data loggers and microcontrollers with analog voltage input channels (e.g. Arduino) and can also be integrated into digital measurement systems via SDI-12. If you are unsure about the compatibility of an existing data logger or measurement system, please feel free to contact us at any time.

    Contact

    You need a quotation, have questions about a product, or need extensive technical advice in the context of your project planning. Starting with an initial determination of your needs, through the detailed planning of the required measurement equipment and data transmission technology, up to professional implementation on site, we are at your disposal at any time with advice and action.

    General information on order processing

    Thank you for your interest in our products and services! Here you will find important information about the ordering process:

    To our international customers: Please note, we ship worldwide! If we do not currently have a listed distributor in your country (a list can be found here) , please feel free to contact us directly.

    Assessment of your needs

    With your consideration and input, we determine which of our products best meet your needs. We are also happy to design fully-integrated measuring stations (plant, climate, soil sensors), including an independent power supply and mobile data transmission, depending on your requirements.

    Do you require our assistance before placing an order?

    We are happy to help! So that we can provide you with correct and helpful advice, please fill out the online form below with your contact details and other information about your application and send it our way. We will then immediately review your details and contact you.

    Are you already familiar with our products and know exactly what you need?

    Perfect, then just write us an email! In your order, please state the diameter of your measuring objects in addition to the required cable lengths.

    Your contact details and Assessment of your needs

    Like so many things, everything started with an idea ...

    In the case of the plant scientist and founder of ECOMATIK, Dr. Liu, it was the idea that modern measurement technology should enable crucial plant physiological parameters to be measured directly, precisely and with high temporal resolution on the plant itself. It was obvious to him that there is an information potential of immense value in the detailed understanding of immediate reactions of plants to their environment...