DD-L Diameter Dendrometer Large

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

    DD-L dendrometers are specially designed for small- to medium-sized stems and branches (with diameters ranging from 3 to 30 cm; DD-L1W, max. 20 cm diameter). DD-L dendrometers are fixed to the measuring object with two UV-resistant elastic bands. This simple and very stable mounting method fixes the sensor at the desired measuring point without exerting excessive pressure on the trunk surface. DD-L dendrometers are available in four versions:

    1. DD-L1: with a measuring range of 11 mm for species with slow and average growth rates.
    2. DD-L2: larger measuring range of 25 mm for fast-growing species.
    3. DD-L3: larger measuring range of 50 mm for very fast-growing species.DD-L1W (previously DDW): hermetically sealed to withstand extreme environmental conditions, e.g. high humidity, underwater, below snow cover, near the ground surface, elevated exposure to dust or corrosive agents (e.g. coastal sands, volcanic ash), etc. The DD-L1W is (suitable for trunk diameters between 3 and 20 cm)

    Advantages

    • Suitable for small to medium stems and branches with diameters between 3 and 30 cm (DD-L1W, 3 – 20 cm)
    • Lightweight sensor
    • Injury-free installation, minimal pressure on the plant
    • Maximum stability against wind, snow, falling branches and fruit
    • Diameter-specific frame size available for diameters ranging from 3 – 30 cm

    Specific to the DD-L2 & DD-L3 models

    • Extended measuring range; reduced maintenance effort (i.e. longer time interval between readjustment of the dendrometer frame) for fast-growing species

    Specific to the DD-L1W model

    • Hermetically sealed to withstand extreme environmental conditions: e.g. high humidity, underwater, below snow cover, near the ground surface, elevated exposure to dust or corrosive agents (e.g. coastal sands and salt, volcanic ash), etc.

    Limits of the DD-L series

    • Not suitable for diameters > 30 cm (or > 20 cm DD-L1W), (see types DC and DR for diameters > 30 cm)

    Specific to the DD-L1, DD-L2 & DD-L3 models

    • Not suitable for operation under extreme environmental conditions: e.g. high humidity, underwater, below snow cover, near the ground surface, elevated exposure to dust or corrosive agents (e.g. coastal sands, volcanic ash), etc. (see model DD-L1W)

    Models

    ModelsSuitable fordiameterMeasurement range
    DD-L13 - 30 cm11 mm
    DD-L23 - 30 cm25 mm
    DD-L33 - 20 cm50 mm
    DD-L1W (hermetically sealed)3 - 20 cm11 mm

    Technical data

    Sensor designation

    Large diameter dendrometer

    Type DD-L1 and DD-L1W (encapsulated)

    Large diameter dendrometer

    Type DD-L2

    Large diameter dendrometer

    Type DD-L3

    Application range

    slow/normal growing

    fast growing

    very fast growing

    Suitable for

    DD-L1: 3-30 cm; DD-L1W: 3-20cm

    3-30 cm

    3-30 cm

    Limitation / Special feature

    Non-invasive mounting

    DD-L1W: encapsulated with extended application range, see operating conditions below.

    Non-invasive mounting

    Extended measuring range for fast-growing species

    Non-invasive mounting

    Extended measuring range for very fast-growing species

    Measuring range

    11 mm linear

    25.4 mm linear

    50.8 mm linear

    Resolution

    Depending on data logger, e.g.:

    CR300 series: 0.01 µm

    Dendrometer logger DL18: 0.2 µm

    Depending on data logger, e.g.:

    CR300 series: 0.03 µm

    Dendrometer logger DL18: 0.5 µm

    Depending on data logger, e.g.:

    CR300 series: 0.05 µm

    Dendrometer logger DL18: 1 µm

    Accuracy

    Sensor-dependent: max. ± 4.5% of measured value (stable offset)

    Logger-dependent, e.g.

    CR300 series: ± (0.04% of measured value +0.3 µm)

    Dendrometer logger DL18: ±(0.1% of measured value +0.45 µm)

    Sensor-dependent: max. ± 1.97% of measured value (stable offset)

    Logger-dependent, e.g.

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

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

    Sensor-dependent: max. ± 0.98% of measured value (stable offset)

    Logger-dependent, e.g.

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

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

    Accuracy

    Dendrometer dependent: max. ± 4.5% of measured value (stable offset)

    Logger dependent, e.g.

    CR300 series: ± (0.04% of measured value +0.3 µm)

    Dendrometer Logger DL18: ±(0.1% of measured value +0.45 µm)

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

    Logger dependent, e.g.

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

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

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

    Logger dependent, e.g.

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

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

    Output signal

    Analog: 0V to Vex (supply voltage)

    Digital, SDI-12: output in µm

    Analog: 0V to Vex (supply voltage)

    Digital, SDI-12: output in µm

    Analog: 0V to Vex (supply voltage)

    Digital, SDI-12: output in µm

    Data recording

    Flexible options for data recording & transmission:

    1. Data logger, manual readout (analog or SDI-12, e.g. DL 18 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)

    Flexible options for data recording & transmission:

    1. Data logger, manual readout (analog or SDI-12, e.g. DL 18 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)

    Flexible options for data recording & transmission:

    1. Data logger, manual readout (analog or SDI-12, e.g. DL 18 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 coefficient of sensor

    <0.2 µm/°C over entire measuring range

    <0.2 µm/°C over entire measuring range

    <0.2 µm/°C over entire measuring range

    Linearity

    <1%

    <0.7%

    <0.5%

    Operating conditions

    All models:

    normal outdoor conditions, -25 to 70 °C, 0 to 100% relative humidity;

    Encapsulated model DD-L1W:

    also suitable for extreme environmental conditions (underwater, below snow cover, highly corrosive substances e.g. salt water, ash, aggressive agricultural chemicals)

    All models:

    normal outdoor conditions, -25 to 70 °C, 0 to 100% relative humidity;

    All models:

    normal outdoor conditions, -25 to 70 °C, 0 to 100% relative humidity;

    Weight sensor (without cable)

    13 g (DD-L1), 30 g (DD-L1W)

    33 g

    43 g

    Power supply

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

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

    Vex (! regulated !) 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 to max. 100 m

    5 m, extendable to max. 100 m

    5 m, extendable to max. 100 m

    Manuals

    DD-L1

    DD-L1(251.5 kB)

    DD-L2

    DD-L2(229.7 kB)

    DD-L3

    DD-L3(233.0 kB)

    DD-L1W

    DD-L1W(297.0 kB)

    Technical data sheets

    DD-L1, DD-L2 & DD-L3

    DD-L1, DD-L2 & DD-L3(156.5 kB)

    DD-L1W

    DD-L1W(102.7 kB)

    Video installation guides

    DD-L
    DD-L1W

    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.

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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...