DR Radius Dendrometer

    The DR series dendrometers are used for high-precision and continuous measurement of stem diameter changes. 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. DR dendrometers are specially designed for tree trunks with medium to very large diameters (> 8 cm; or DR3, DR3W, DR6, DR7 > 5 cm). DR dendrometers are mounted with one (DR3, DR3W, DR6, DR7) or two special screws (DR1, DR1W, DR2, DR4) anchored in the tree stem. The changes outside the trunk wood correspond to then radial growth and the daily variation of the trunk diameter, which is associated with tree water status. Screw-mounting ensures extreme stability for long-term measurements with limited maintenance options. DR dendrometers are available in different versions:

    • 11 mm Measurement Range (normal growth speed):
    1. DR1: with standard mounting frame and measuring range from of 11 mm for species with slow and average growth rates
    2. DR1W: hermetically sealed to withstand extreme environmental conditions (under snow cover, underwater, elevated exposure to dust and corrosive agents), with standard mounting frame, measuring range of 11 mm for species with slow and average growth rates
    3. DR3: quick assembly frame with only 1 screw, suitable for treediameters >5 cm, measuring range of 11 mm for species with slow and average growth rates
    4. DR3W: hermetically sealed to withstand extreme environmental conditions (under snow cover, underwater, elevated exposure to dust and corrosive agents), quick assembly frame with only 1 screw, for tree diameters >5 cm, measuring range of 11 mm for species with slow and average growth rate
    5. DR6: quick mount frame with only 1 screw for tool-less installation, suitable for treediameters >5 cm, measuring range of 25 mm for species with high growth rates
    • 25 mm Measurement Range (high growth speed):
    1. DR2: with standard mounting frame and larger measuring range of 25 mm for fast-growing species
    2. DR6: quick mount frame with only 1 screw for tool-less installation, suitable for treediameters >5 cm, measuring range of 25 mm for species with high growth rates
    • 50 mm Measurement Range (very high growth speed):
    1. DR4: with standard mounting frame and even larger measuring range of 50 mm for very fast-growing species

    Advantages of the DR series

    • Suitable for large stem diameters (> 8cm)
    • Minimal contact pressure on tree trunk surface
    • Maximum stability against wind, snow, falling branches and fruit
    • Ideal for long-term measurements with limited maintenance work

    Specific to the DR2 model

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

    Specific to the DR3 & DR3W models

    • Quick mounting frame with only 1 screw
    • Can be used for trunk diameters >5 cm

    Specific to the DR1W & DR3W models

    • 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.

    Limits of the DR rangeseries

    • Drilling and installing the anchoring screws in the trunk may injure the tree (the damage can be minimized by using wound closure resin)
    • Not suitable for small trunk diameters (<8 or < 5 cm)

    Models

    Model Name For Diameter Measurement range
    DR1> 8 cm11 mm
    DR1W (sealed)> 8 cm11 mm
    DR3 (quick mount frame, 1 screw)> 5 cm11 mm
    DR3W (quick mount frame, 1 screw, sealed)> 5 cm11 mm
    DR7 (quick mount frame, 1 screw)> 5 cm11 mm
    DR2> 8 cm25 mm
    DR6 (quick mount frame, 1 screw)> 5 cm25 mm
    DR4> 8 cm50 mm

    Technical data

    Sensor name

    Radius dendrometer
    Type DR1 and DR1W (encapsulated)

    Radius dendrometer
    Type DR3 and DR3W (encapsulated)

    Radius dendrometer
    Type DR7

    Radius dendrometer
    Type DR2 and DR6

    Radius dendrometer
    Type DR4

    Application

    slow/normal growing

    slow/normal growing

    slow/normal growing

    fast growing

    very fast growing

    Suitable for

    Diameter: > 8 cm

    Diameter: > 5 cm

    Diameter: > 5 cm

    DR2: Diameter: > 8 cm

    DR6: Diameter: > 5 cm

    Diameter: > 8 cm

    Special feature / limitation

    Mounted with 2 trunk screws; DR1W: encapsulated with extended application range, see operating conditions below.

    Mounted with only 1 trunk screw; dual-point installation possible: separate measurement of wood and bark (requires 2 DR3 sensors); DR3W: encapsulated with extended application range, see operating conditions below.

    Mounted with only 1 trunk screw; tool-free installation.

    DR2: Mounted with 2 trunk screws

    DR6: Mounted with only 1 trunk screw; tool-free installation

    Mounted with 2 trunk screws

    Measurement range

    11 mm linear

    11 mm linear

    11 mm linear

    25.4 mm linear

    50.8 mm linear

    Resolution

    Depends on data logger, e.g.:
    CR300 series: 0.01 µm
    Dendrometer Logger DL18: 0.2 µm

    Depends on data logger, e.g.:
    CR300 series: 0.01 µm
    Dendrometer Logger DL18: 0.2 µm

    Depends on data logger, e.g.:
    CR300 series: 0.01 µm
    Dendrometer Logger DL18: 0.2 µm

    Depends on data logger, e.g.:
    CR300 series: 0.03 µm
    Dendrometer Logger DL18: 0.5 µm

    Depends on data logger, e.g.:
    CR300 series: 0.05 µm
    Dendrometer Logger DL18: 1 µm

    Accuracy

    Depends on dendrometer: max. ± 4.5% of measured value (stable offset)
    Depends on logger, e.g.
    CR300 series: ± (0.04% of measured value +0.3 µm)
    Dendrometer Logger DL18: ± (0.1% of measured value +0.45 µm)

    Depends on dendrometer: max. ± 4.5% of measured value (stable offset)
    Depends on logger, e.g.
    CR300 series: ± (0.04% of measured value +0.3 µm)
    Dendrometer Logger DL18: ± (0.1% of measured value +0.45 µm)

    Depends on dendrometer: max. ± 4.5% of measured value (stable offset)
    Depends on logger, e.g.
    CR300 series: ± (0.04% of measured value +0.3 µm)
    Dendrometer Logger DL18: ± (0.1% of measured value +0.45 µm)

    Depends on dendrometer: max. ± 1.97% of measured value (stable offset)
    Depends on logger, e.g.
    CR300 series: ± (0.04% of measured value +0.6 µm)
    Dendrometer Logger DL18: ± (0.1% of measured value +1 µm)

    Depends on dendrometer: max. ± 0.98% of measured value (stable offset)
    Depends on logger, 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: 0 V to Vex (supply voltage)

    Digital, SDI-12: Output in µm

    Analog: 0 V to Vex (supply voltage)

    Digital, SDI-12: Output in µm

    Analog: 0 V to Vex (supply voltage)

    Digital, SDI-12: Output in µm

    Analog: 0 V to Vex (supply voltage)

    Digital, SDI-12: Output in µm

    Analog: 0 V to Vex (supply voltage)

    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)

    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)

    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)

    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)

    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)

    Sensor temperature coefficient

    <0.2 µm/°C over the entire measurement range

    <0.2 µm/°C over the entire measurement range

    <0.2 µm/°C over the entire measurement range

    <0.2 µm/°C over the entire measurement range

    <0.2 µm/°C over the entire measurement range

    Linearity

    1%

    <1%

    <1%

    <0.7%

    <0.5%

    Operating conditions

    All models:
    Temperature: -25 to +70 °C
    Humidity: 0 to 100% RH

    Encapsulated model DR1W:
    Also suitable for extreme environmental conditions (underwater, below snow cover, highly corrosive substances such as salt water, ash, aggressive agricultural chemicals)

    All models:
    Temperature: -25 to +70 °C
    Humidity: 0 to 100% RH

    Encapsulated model DR3W:
    Also suitable for extreme environmental conditions (underwater, below snow cover, highly corrosive substances such as salt water, ash, aggressive agricultural chemicals)

    All models:
    Temperature: -25 to +70 °C
    Humidity: 0 to 100% RH

    All models:
    Temperature: -25 to +70 °C
    Humidity: 0 to 100% RH

    All models:
    Temperature: -25 to +70 °C
    Humidity: 0 to 100% RH

    Sensor weight (without cable)

    15 g (DR1), 25 g (DR1W)

    15 g (DR3), 25 g (DR3W)

    25 g

    35 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.

    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

    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

    5 m, extendable to max. 100 m

    5 m, extendable to max. 100 m

    Manuals

    DR1

    DR1(336.0 kB)

    DR1W

    DR1W(219.0 kB)

    DR2

    DR2(205.5 kB)

    DR3

    DR3(191.8 kB)

    DR3W

    DR3W(157.8 kB)

    DR6

    DR6(471.2 kB)

    DR7

    DR7(907.4 kB)

    Technical data sheets

    DR1, DR1W, DR2, DR3, DR3W, DR4, DR6, DR7

    DR1, DR1W, DR2, DR3, DR3W, DR4, DR6, DR7(216.0 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.

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    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...