DC Circumference Dendrometer

    The DC series dendrometers are used for high-precision and continuous measurement of changes in stem circumference. These devices are suitable for long-term use in outdoor conditions. Due to their extremely low power consumption, Ecomatik dendrometers are ideal for battery-powered solutions, e.g., in IoT applications.

    Changes in stem circumference are recorded by a metal cable that wraps around the stem. This cable is comprised of a special alloy with the lowest possible coefficient of thermal expansion. Friction and pressure between the cable and the stem surface are minimized by special slide rings.

    The simplest model in the DC series, the DC1, is attached to the measuring object by the tension of the spring-loaded cable. The tension force is imparted tangentially, and the circumferential signal is recorded directly via the metal cable.

    DC3 and DC4 are improved versions of the DC series. The tension force exerted by the sensor spring is transmitted to the measuring wire in radial, and not tangential (cf. DC1), direction. This patented, special design of the DC3 and DC4 dendrometers significantly improves the comparability of the measurement data from objects of different diameters. Additionally, this design ensures a consistently stable installation on objects with both small and very large diameters (more information: difference between the various circumferential dendrometers).

    Advantages

    • Maximum stability against wind, snow, falling branches and fruits
    • Easy and injury-free installation

    Specific to the DC3 & DC4 models

    • Suitable for all stem diameters (> 5 cm)
    • Improved data comparability between measurements on tree diameters
    • Exact measurements (even with very large trees)

    Limits

    • Not suitable for measurements underwater nor under snow cover
    • Specific to the DC1 model

    • Measurement data between trees with very different diameters are usually not comparable.
    • Measurement values on trees with increasing diameter may be problematic due to the decreasing contact pressure between cable and trunk surface.
    • Specific to the DC3 & DC4 models

    • Raw measurement data must be converted to circumference in mm (Excel program available)
    • The cross-section of the measurement object should be approximately circular

    Models

    Model nameSuitable for diametersMeasurement range
    DC15 – 32 cm11 mm
    DC3> 5 cm25.4 mm
    DC4> 5 cm50.8 mm

    Technical data

    Sensor model name

    Circumference Dendrometer 1

    Type DC1

    Circumference Dendrometer 3

    Type DC3

    Circumference Dendrometer 4

    Type DC4

    Scope of application

    Slow/average growth rates

    Slow/average growth rates

    Fast-growing

    Suitable for diameter

    5 – 32 cm

    > 5 cm

    > 5 cm

    Special features/limitations

    Confined comparability with different trunk diameters

    Comparability for different trunk diameters improved.

    Comparability for different trunk diameters improved.

    Measurement range

    11 mm linear ≙ 11 mm circumference

    25.4 mm linear ≙

    circumference (diameter-dependent):

    50 mm (at Ø 10 cm)

    35 mm (at Ø 50 cm)

    28 mm (at Ø 100 cm)

    50.8 mm linear ≙

    circumference (diameter-dependent):

    107 mm (at Ø 10 cm)

    80 mm (at Ø 50 cm)

    65 mm (at Ø 100 cm)

    Resolution

    Data logger dependent e.g.:

    CR300 series: 0.01 µm

    Dendrometer logger DL18: 0.2 µm

    Data logger dependent e.g.:

    CR300 series: 0.03 µm

    Dendrometer logger DL18: 0.5 µm

    Data logger dependent e.g.:

    CR300 series: 0.05 µm

    Dendrometer logger DL18: 1 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)

    Dendrometer dependent: max. ± 1.97% of the measured value (stable offset)

    Data logger dependent e.g.:

    CR300 series: ± (0.04% of the measured value + 0.6 µm)

    Dendrometer logger DL18: ± (0.1% of the measured value + 1 µm)

    Dendrometer dependent: max. ± 0.98% of the measured value (stable offset)

    Data logger dependent e.g.:

    CR300 series: ± (0.04% of the measured value + 1.2 µm)

    Dendrometer logger DL18: ± (0.1% of the measured value + 2 µm)

    Output signal

    Analogue, 0V to Vex (excitation supply voltage)

    Analogue, 0V to Vex (excitation supply voltage)

    Analogue, 0V to Vex (excitation supply voltage)

    Temperature drift of the sensor

    < 0.2 µm/°C in the whole measurement range

    < 0.2 µm/°C in the whole measurement range

    < 0.2 µm/°C in the whole measurement range

    Temperature coefficient of the stem embracing cable wire

    < 1.4 ×10-6/K

    < 1.4 ×10-6/K

    < 1.4 ×10-6/K

    Linearity

    < 1%

    < 0.7%

    < 0.5%

    Operational conditions

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

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

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

    Weight (sensor without cable)

    13 g

    37 g

    47 g

    Power supply

    Vex (! stabilized !) 0.5 to 10 VDC,

    Power consumption max. 0.28 µWh per measurement

    Vex (! stabilized !) 0.5 to 10 VDC,

    Power consumption max. 0.28 µWh per measurement

    Vex (! stabilized !) 0.5 to 10 VDC,

    Power consumption max. 0.28 µWh per measurement

    Material

    Stainless steel and aluminium

    Stainless steel and aluminium

    Stainless steel and aluminium

    Sensor cable length

    5 m, extendable on request to max. 100 m

    5 m, extendable on request to max. 100 m

    5 m, extendable on request to max. 100 m

    Manuals

    Technical data sheets

    Additional information

    Special information for integrators & developers

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    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...