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

Stems or branches

Suitable for diameter

5 – 32 cm

Special features/limitations

2x trunk screws for mounting

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

Analogue, 0V to Vex (excitation supply voltage)

Temperature drift of the sensor

< 0.2 µm/°C in the whole measurement range

Temperature coefficient of the stem embracing cable wire

< 1.4 ×10-6/K

Linearity

< 1%

Operational conditions

Normal outdoor field conditions, -25 to 70 ° C, 0 to 100% relative air humidity; unsuitable underwater and 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

Manuals

Technical data sheets

Special information for integrators & developers

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Accessories & Compatible Products

Data loggers

From small and compact to an extensive measuring network, Ecomatik offers complete system solutions for sensor data acquisition in any desired size:

Note

The output signal of all Ecomatik dendrometer models is an analogue DC voltage. Our dendrometers are therefore compatible with almost all common data loggers and microcontrollers with analogue voltage input channels (e.g. also Arduino). If you are unsure about the compatibility of an existing data logger, please do not hesitate to contact us.

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.

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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...